{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T12:28:09Z","timestamp":1790166489481,"version":"4.1.0"},"reference-count":109,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2022,11,23]],"date-time":"2022-11-23T00:00:00Z","timestamp":1669161600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["20-73-10135"],"award-info":[{"award-number":["20-73-10135"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO2. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well as a source of nitrogen. Mixing the reagents under a control of pH leads to an amorphous titanium oxide hydrate, which can be further successfully converted to nanocrystalline anatase TiO2 through calcination in air at an increased temperature. The as-prepared N-doped TiO2 provides the complete oxidation of volatile organic compounds both under UV and visible light, and the action spectrum of N-doped TiO2 correlates to its absorption spectrum. The key role of paramagnetic nitrogen species in the absorption of visible light and in the visible-light-activity of N-doped TiO2 is shown using the EPR technique. Surface modification of N-doped TiO2 with copper species prevents its intense deactivation under highly powerful radiation and results in a nanocomposite photocatalyst with enhanced activity and stability. The photocatalysts prepared under different conditions are discussed regarding the effects of their characteristics on photocatalytic activity under UV and visible light.<\/jats:p>","DOI":"10.3390\/nano12234146","type":"journal-article","created":{"date-parts":[[2022,11,24]],"date-time":"2022-11-24T02:54:05Z","timestamp":1669258445000},"page":"4146","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Visible-Light-Active N-Doped TiO2 Photocatalysts: Synthesis from TiOSO4, Characterization, and Enhancement of Stability Via Surface Modification"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2507-6883","authenticated-orcid":false,"given":"Nikita","family":"Kovalevskiy","sequence":"first","affiliation":[{"name":"Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dmitry","family":"Svintsitskiy","sequence":"additional","affiliation":[{"name":"Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2027-0062","authenticated-orcid":false,"given":"Svetlana","family":"Cherepanova","sequence":"additional","affiliation":[{"name":"Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stanislav","family":"Yakushkin","sequence":"additional","affiliation":[{"name":"Department of Physicochemical Methods of Research, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oleg","family":"Martyanov","sequence":"additional","affiliation":[{"name":"Department of Physicochemical Methods of Research, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Svetlana","family":"Selishcheva","sequence":"additional","affiliation":[{"name":"Engineering Center, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4302-1763","authenticated-orcid":false,"given":"Evgeny","family":"Gribov","sequence":"additional","affiliation":[{"name":"Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Denis","family":"Kozlov","sequence":"additional","affiliation":[{"name":"Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9930-8149","authenticated-orcid":false,"given":"Dmitry","family":"Selishchev","sequence":"additional","affiliation":[{"name":"Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"6657","DOI":"10.1021\/acsaem.8b01345","article-title":"Photocatalysis: From Fundamental Principles to Materials and Applications","volume":"1","author":"Yang","year":"2018","journal-title":"ACS Appl. Energy Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/j.trechm.2019.06.009","article-title":"Emerging Photocatalysts for Hydrogen Evolution","volume":"2","author":"Cao","year":"2020","journal-title":"Trends Chem."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1038\/238037a0","article-title":"Electrochemical Photolysis of Water at a Semiconductor Electrode","volume":"238","author":"Fujishima","year":"1972","journal-title":"Nature"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1016\/j.jphotochemrev.2012.06.001","article-title":"TiO2 Photocatalysis: Design and Applications","volume":"13","author":"Nakata","year":"2012","journal-title":"J. Photochem. Photobiol. C Photochem. Rev."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"9919","DOI":"10.1021\/cr5001892","article-title":"Understanding TiO2 Photocatalysis: Mechanisms and Materials","volume":"114","author":"Schneider","year":"2014","journal-title":"Chem. Rev."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"515","DOI":"10.1016\/j.surfrep.2008.10.001","article-title":"TiO2 Photocatalysis and Related Surface Phenomena","volume":"63","author":"Fujishima","year":"2008","journal-title":"Surf. Sci. Rep."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jphotochemrev.2007.12.003","article-title":"Heterogeneous Photocatalytic Degradation of Organic Contaminants over Titanium Dioxide: A Review of Fundamentals, Progress and Problems","volume":"9","author":"Gaya","year":"2008","journal-title":"J. Photochem. Photobiol. C Photochem. Rev."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"125959","DOI":"10.1016\/j.colsurfa.2020.125959","article-title":"Surface Modification of TiO2 with Pd Nanoparticles for Enhanced Photocatalytic Oxidation of Benzene Micropollutants","volume":"612","author":"Selishchev","year":"2021","journal-title":"Colloids Surf. A Physicochem. Eng. Asp."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"448","DOI":"10.1016\/j.apcatb.2010.05.011","article-title":"Application of TiO2 Photocatalysis for Air Treatment: Patents\u2019 Overview","volume":"99","author":"Paz","year":"2010","journal-title":"Appl. Catal. B"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1016\/j.apcata.2010.01.030","article-title":"Adsorbent as an Essential Participant in Photocatalytic Processes of Water and Air Purification: Computer Simulation Study","volume":"377","author":"Selishchev","year":"2010","journal-title":"Appl. Catal. A Gen."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"398","DOI":"10.1016\/j.apcatb.2010.05.014","article-title":"TiO2 for Water Treatment: Parameters Affecting the Kinetics and Mechanisms of Photocatalysis","volume":"99","author":"Friedmann","year":"2010","journal-title":"Appl. Catal. B"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"889","DOI":"10.1016\/j.jcis.2021.06.074","article-title":"Formation of Unique Hollow ZnSnO3@ZnIn2S4 Core-Shell Heterojunction to Boost Visible-Light-Driven Photocatalytic Water Splitting for Hydrogen Production","volume":"602","author":"Guo","year":"2021","journal-title":"J. Colloid Interface Sci."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3185","DOI":"10.1039\/C9EN00891H","article-title":"Status and Challenges in Photocatalytic Nanotechnology for Cleaning Air Polluted with Volatile Organic Compounds: Visible Light Utilization and Catalyst Deactivation","volume":"6","author":"Weon","year":"2019","journal-title":"Environ. Sci. Nano"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"121725","DOI":"10.1016\/j.jclepro.2020.121725","article-title":"Photocatalytic Degradation of Organic Pollutants Using TiO2-Based Photocatalysts: A Review","volume":"268","author":"Chen","year":"2020","journal-title":"J. Clean. Prod."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1016\/j.jphotochemrev.2015.07.001","article-title":"TiO2 Photocatalysis for the Degradation of Pollutants in Gas Phase: From Morphological Design to Plasmonic Enhancement","volume":"24","author":"Verbruggen","year":"2015","journal-title":"J. Photochem. Photobiol. C Photochem. Rev."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"4703","DOI":"10.1039\/C5CY00879D","article-title":"Structural Design of TiO2-Based Photocatalyst for H2 Production and Degradation Applications","volume":"5","author":"Gao","year":"2015","journal-title":"Catal. Sci. Technol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"5018","DOI":"10.1021\/ja711023z","article-title":"The Electronic Origin of the Visible-Light Absorption Properties of C-, N- and S-Doped TiO2 Nanomaterials","volume":"130","author":"Chen","year":"2008","journal-title":"J. Am. Chem. Soc."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"86","DOI":"10.1080\/17518253.2018.1440324","article-title":"Modification Strategies of TiO2 for Potential Applications in Photocatalysis: A Critical Review","volume":"11","author":"Humayun","year":"2018","journal-title":"Green Chem. Lett. Rev."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jphotochemrev.2015.08.003","article-title":"Visible-Light Activation of TiO2 Photocatalysts: Advances in Theory and Experiments","volume":"25","author":"Etacheri","year":"2015","journal-title":"J. Photochem. Photobiol. C Photochem. Rev."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Yang, Y., Fang, W., Mi, Y., Yan, J., Li, X., and Shangguan, W. (2022). Enhanced Photocatalytic Overall Water Splitting by Tuning the Relative Concentration Ratio of Bulk Defects to Surface Defects in SrTiO3. Int. J. Hydrog. Energy, in press.","DOI":"10.1016\/j.ijhydene.2022.10.030"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"126","DOI":"10.1016\/0009-2614(86)87026-9","article-title":"Photocatalytic Activity of NOx-Doped TiO2 in the Visible Light Region","volume":"123","author":"Sato","year":"1986","journal-title":"Chem. Phys. Lett."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1126\/science.1061051","article-title":"Visible-Light Photocatalysis in Nitrogen-Doped Titanium Oxides","volume":"269","author":"Asahi","year":"2001","journal-title":"Science"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"085116","DOI":"10.1103\/PhysRevB.70.085116","article-title":"Origin of the Different Photoactivity of N-Doped Anatase and Rutile TiO2","volume":"70","author":"Pacchioni","year":"2004","journal-title":"Phys. Rev. B"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"11414","DOI":"10.1021\/jp051756t","article-title":"Characterization of Paramagnetic Species in N-Doped TiO2 Powders by EPR Spectroscopy and DFT Calculations","volume":"109","author":"Pacchioni","year":"2005","journal-title":"J. Phys. Chem. B"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"44","DOI":"10.1016\/j.chemphys.2007.07.020","article-title":"N-Doped TiO2: Theory and Experiment","volume":"339","author":"Finazzi","year":"2007","journal-title":"Chem. Phys."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"131","DOI":"10.1016\/j.apcata.2005.01.028","article-title":"Visible-Light Sensitization of TiO2 Photocatalysts by Wet-Method N Doping","volume":"284","author":"Sato","year":"2005","journal-title":"Appl. Catal. A Gen."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1007\/BF02841209","article-title":"Preparation, Characterization and Visible Light Photocatalytic Activity of Nitrogen-Doped TiO2","volume":"21","author":"Zhengpeng","year":"2006","journal-title":"J. Wuhan Univ. Technol. Mater. Sci. Ed."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"15666","DOI":"10.1021\/ja064164c","article-title":"Origin of Photoactivity of Nitrogen-Doped Titanium Dioxide under Visible Light","volume":"128","author":"Livraghi","year":"2006","journal-title":"J. Am. Chem. Soc."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"802","DOI":"10.1016\/S1004-9541(08)60006-3","article-title":"Preparation of Nitrogen-Doped TiO2 Nanoparticle Catalyst and Its Catalytic Activity under Visible Light","volume":"15","author":"Huan","year":"2007","journal-title":"Chin. J. Chern. Eng."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"598","DOI":"10.1016\/j.egypro.2012.01.096","article-title":"Enhanced Photocatalytic Activity of Nitrogen Doped TiO2 Anatase Nano-Particle under Simulated Sunlight Irradiation","volume":"16","author":"Cheng","year":"2012","journal-title":"Energy Procedia"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1230","DOI":"10.1021\/jp030843n","article-title":"Highly Efficient Formation of Visible Light Tunable TiO2-xNx Photocatalysts and Their Transformation at the Nanoscale","volume":"108","author":"Gole","year":"2004","journal-title":"J. Phys. Chem. B"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"253","DOI":"10.1016\/j.jhazmat.2009.02.036","article-title":"Visible Light Absorption Ability and Photocatalytic Oxidation Activity of Various Interstitial N-Doped TiO2 Prepared from Different Nitrogen Dopants","volume":"168","author":"Ananpattarachai","year":"2009","journal-title":"J. Hazard. Mater."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1326","DOI":"10.1016\/j.ijhydene.2005.11.016","article-title":"Preparations and Photocatalytic Hydrogen Evolution of N-Doped TiO2 from Urea and Titanium Tetrachloride","volume":"31","author":"Yuan","year":"2006","journal-title":"Int. J. Hydrog. Energy"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"17269","DOI":"10.1021\/jp0467090","article-title":"Oxidative Power of Nitrogen-Doped TiO2 Photocatalysts under Visible Illumination","volume":"108","author":"Mrowetz","year":"2004","journal-title":"J. Phys. Chem. B"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"6976","DOI":"10.1021\/jp0685030","article-title":"Synthesis and Characterization of Nitrogen-Doped TiO2 Nanophotocatalyst with High Visible Light Activity","volume":"111","author":"Cong","year":"2007","journal-title":"J. Phys. Chem. C"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/j.jphotochem.2016.10.013","article-title":"On the Apparent Visible-Light and Enhanced UV-Light Photocatalytic Activity of Nitrogen-Doped TiO2 Thin Films","volume":"333","author":"Chadwick","year":"2017","journal-title":"J. Photochem. Photobiol. A Chem."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"6349","DOI":"10.1021\/cm052047v","article-title":"Synthesis, Characterization, Electronic Structure, and Photocatalytic Activity of Nitrogen-Doped TiO2 Nanocatalyst","volume":"17","author":"Sathish","year":"2005","journal-title":"Chem. Mater."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1142\/S0219581X07004390","article-title":"Influence of Heteroatom Doping of TiO2 Nanoparticle on the Red Shift and the Related Catalytic Activity","volume":"6","author":"Sathish","year":"2007","journal-title":"Int. J. Nanosci."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"418","DOI":"10.1016\/j.egypro.2011.09.046","article-title":"Synthesis and Characterization of Nitrogen-Doped TiO2 Nanomaterials for Photocatalytic Activities under Visible Light","volume":"9","author":"Chainarong","year":"2011","journal-title":"Energy Procedia"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1016\/j.apcatb.2015.01.039","article-title":"Nanostructured N-Doped TiO2 Coated on Glass Spheres for the Photocatalytic Removal of Organic Dyes under UV or Visible Light Irradiation","volume":"170","author":"Vaiano","year":"2015","journal-title":"Appl. Catal. B"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"841","DOI":"10.1080\/10934520902958443","article-title":"Photodegradation of Phenanthrene by N-Doped TiO2 Photocatalyst","volume":"44","author":"Sirisaksoontorn","year":"2009","journal-title":"J. Environ. Sci. Health Part A"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"14834","DOI":"10.1016\/j.ceramint.2016.06.117","article-title":"Synthesis and Characterization of N-Doped TiO2 Nanoparticles and Their Application in Photocatalytic Oxidation of Dibenzothiophene under Visible Light","volume":"42","author":"Kalantari","year":"2016","journal-title":"Ceram. Int."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1016\/j.watres.2015.05.056","article-title":"Kinetics of Ethyl Paraben Degradation by Simulated Solar Radiation in the Presence of N-Doped TiO2 Catalysts","volume":"81","author":"Petala","year":"2015","journal-title":"Water Res."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1016\/j.cej.2010.04.034","article-title":"Photocatalytic Degradation of Lindane under UV and Visible Light Using N-Doped TiO2","volume":"161","author":"Senthilnathan","year":"2010","journal-title":"Chem. Eng. J."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"462","DOI":"10.1016\/j.apcatb.2014.09.062","article-title":"Photocatalytic Removal of Atrazine Using N-Doped TiO2 Supported on Phosphors","volume":"164","author":"Sacco","year":"2015","journal-title":"Appl. Catal. B"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"2994","DOI":"10.3390\/molecules15052994","article-title":"Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-Doped TiO2","volume":"15","author":"Todorova","year":"2010","journal-title":"Molecules"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"127979","DOI":"10.1016\/j.jhazmat.2021.127979","article-title":"A Critical Review on N-Modified TiO2 Limits to Treat Chemical and Biological Contaminants in Water. Evidence That Enhanced Visible Light Absorption Does Not Lead to Higher Degradation Rates under Whole Solar Light","volume":"425","author":"Pulgarin","year":"2022","journal-title":"J. Hazard. Mater."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"627","DOI":"10.1002\/pssb.19660150224","article-title":"Optical Properties and Electronic Structure of Amorphous Germanium","volume":"15","author":"Tauc","year":"1966","journal-title":"Phys. Status Solidi"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1016\/j.jmr.2005.08.013","article-title":"EasySpin, a Comprehensive Software Package for Spectral Simulation and Analysis in EPR","volume":"178","author":"Stoll","year":"2006","journal-title":"J. Magn. Reson."},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Lyulyukin, M., Filippov, T., Cherepanova, S., Solovyeva, M., Prosvirin, I., Bukhtiyarov, A., Kozlov, D., and Selishchev, D. (2021). Synthesis, Characterization and Visible-Light Photocatalytic Activity of Solid and TiO2-Supported Uranium Oxycompounds. Nanomaterials, 11.","DOI":"10.3390\/nano11041036"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"931","DOI":"10.1351\/PAC-REC-09-09-36","article-title":"Glossary of Terms Used in Photocatalysis and Radiation Catalysis (IUPAC Recommendations 2011)","volume":"83","author":"Braslavsky","year":"2011","journal-title":"Pure Appl. Chem."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"101221","DOI":"10.1016\/j.mex.2021.101221","article-title":"Method for Correction of Experimental Action Spectrum Using Actual Overlapping Spectra of Radiation Sources","volume":"8","author":"Lyulyukin","year":"2021","journal-title":"MethodsX"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"112981","DOI":"10.1016\/j.jphotochem.2020.112981","article-title":"Correction of Experimental Action Spectra for TiO2 Photocatalysts Measured Using Single-Peak LEDs","volume":"405","author":"Lyulyukin","year":"2021","journal-title":"J. Photochem. Photobiol. A Chem."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"259","DOI":"10.1016\/j.apcatb.2005.06.004","article-title":"Highly Photoactive Supported TiO2 Prepared by Thermal Hydrolysis of TiOSO4: Optimisation of the Method and Comparison with Other Synthetic Routes","volume":"61","author":"Hidalgo","year":"2005","journal-title":"Appl. Catal. B"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"4969","DOI":"10.1021\/jp0673258","article-title":"Anatase, Brookite, and Rutile Nanocrystals via Redox Reactions under Mild Hydrothermal Conditions: Phase-Selective Synthesis and Physicochemical Properties","volume":"111","author":"Li","year":"2007","journal-title":"J. Phys. Chem. C"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"102911","DOI":"10.1039\/C5RA22816F","article-title":"Quantitative XRD Characterisation and Gas-Phase Photocatalytic Activity Testing for Visible-Light (Indoor Applications) of KRONOClean 7000\u00ae","volume":"5","author":"Tobaldi","year":"2015","journal-title":"RSC Adv."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"7062","DOI":"10.1039\/C7CP00188F","article-title":"Modification of N-Doped TiO2 Photocatalysts Using Noble Metals (Pt, Pd)\u2014A Combined XPS and DFT Study","volume":"19","author":"Bundaleski","year":"2017","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"420","DOI":"10.1039\/C3RA44421J","article-title":"An N-Doped Anatase\/Rutile TiO2 Hybrid from Low-Temperature Direct Nitridization: Enhanced Photoactivity under UV-\/Visible-Light","volume":"4","author":"Hu","year":"2013","journal-title":"RSC Adv."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/j.tsf.2013.04.116","article-title":"Structural and Optical Characteristics of Filtered Vacuum Arc Deposited N:TiOx Thin Films","volume":"537","author":"Burstein","year":"2013","journal-title":"Thin Solid Film"},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"129","DOI":"10.1016\/j.jphotochem.2010.05.011","article-title":"Influence of Nitrogen Chemical States on Photocatalytic Activities of Nitrogen-Doped TiO2 Nanoparticles under Visible Light","volume":"213","author":"Lee","year":"2010","journal-title":"J. Photochem. Photobiol. A Chem."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"523","DOI":"10.1016\/j.elspec.2012.10.011","article-title":"A Complete and Self-Consistent Evaluation of XPS Spectra of TiN","volume":"185","author":"Jaeger","year":"2012","journal-title":"J. Electron Spectrosc. Relat. Phenom."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/j.chemphys.2007.07.041","article-title":"Nitrogen Complex Species and Its Chemical Nature in TiO2 for Visible-Light Sensitized Photocatalysis","volume":"339","author":"Asahi","year":"2007","journal-title":"Chem. Phys."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"2741","DOI":"10.1021\/ie061491k","article-title":"Carbon and Nitrogen Co-Doped TiO2 with Enhanced Visible-Light Photocatalytic Activity","volume":"46","author":"Chen","year":"2007","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1155\/2012\/269654","article-title":"Nitrogen Incorporation in TiO2: Does It Make a Visible Light Photo-Active Material?","volume":"2012","author":"Viswanathan","year":"2012","journal-title":"Int. J. Photoenergy"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1016\/j.jallcom.2012.07.112","article-title":"Relationship between N-Doping Induced Point Defects by Annealing in Ammonia and Enhanced Thermal Stability for Anodized Titania Nanotube Arrays","volume":"543","author":"Liu","year":"2012","journal-title":"J. Alloys Compd."},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"130","DOI":"10.1016\/j.jssc.2007.11.012","article-title":"Synthesis and Characterization of Substitutional and Interstitial Nitrogen-Doped Titanium Dioxides with Visible Light Photocatalytic Activity","volume":"181","author":"Peng","year":"2008","journal-title":"J. Solid State Chem."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"2624","DOI":"10.1021\/jp077417c","article-title":"N Doping of Rutile TiO2 (110) Surface. A Theoretical DFT Study","volume":"112","author":"Graciani","year":"2008","journal-title":"J. Phys. Chem. C"},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"23099","DOI":"10.1021\/acsami.7b03181","article-title":"Role of Oxygen Deposition Pressure in the Formation of Ti Defect States in TiO2 (001) Anatase Thin Films","volume":"9","author":"Gobaut","year":"2017","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"262","DOI":"10.1002\/sia.1296","article-title":"Alteration of Ti 2p XPS Spectrum for Titanium Oxide by Low-Energy Ar Ion Bombardment","volume":"34","author":"Hashimoto","year":"2002","journal-title":"Surf. Interface Anal."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"5223","DOI":"10.1021\/jp057053t","article-title":"EPR Investigation of TiO2 Nanoparticles with Temperature-Dependent Properties","volume":"110","author":"Kumar","year":"2006","journal-title":"J. Phys. Chem. B"},{"key":"ref_71","unstructured":"Ahmed, H., Pepper, M., and Broers, A. (1996). Photoinduced Defects in Semiconductors, Cambridge University Press. Cambridge Studies in Semiconductor Physics and Microelectronic Engineering: 4."},{"key":"ref_72","unstructured":"Funabiki, H., Ozawa, K., and Sekiya, T. (2018, January 8\u201313). Electronic State of Nitrogen in Doped Titanium Dioxide. Proceedings of the 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials (EXCON 2018), Nara City, Japan."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"4353","DOI":"10.1007\/s11164-017-2882-y","article-title":"Characterization of SO42\u2212\/TiO2 and Its Catalytic Activity in the Epoxidation Reaction","volume":"43","author":"Yuan","year":"2017","journal-title":"Res. Chem. Intermed."},{"key":"ref_74","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1016\/S1010-6030(01)00462-2","article-title":"Correlation of TiO2 Photocatalytic Activity and Diffuse Reflectance Spectra","volume":"144","author":"Vorontsov","year":"2001","journal-title":"J. Photochem. Photobiol. A Chem."},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"12","DOI":"10.1016\/j.cattod.2011.11.030","article-title":"Trends in Non-Metal Doping of Anatase TiO2: B, C, N and F","volume":"206","author":"Pacchioni","year":"2013","journal-title":"Catal. Today"},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"123011","DOI":"10.1016\/j.cej.2019.123011","article-title":"Recent Advances in Ti3+ Self-Doped Nanostructured TiO2 Visible Light Photocatalysts for Environmental and Energy Applications","volume":"382","author":"Xiu","year":"2020","journal-title":"Chem. Eng. J."},{"key":"ref_77","doi-asserted-by":"crossref","unstructured":"Na, S., Seo, S., and Lee, H. (2020). Recent Developments of Advanced Ti3+-Self-Doped TiO2 for Efficient Visible-Light-Driven Photocatalysis. Catalysts, 10.","DOI":"10.3390\/catal10060679"},{"key":"ref_78","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1016\/j.jcat.2008.01.025","article-title":"The Effect of Postnitridation Annealing on the Surface Property and Photocatalytic Performance of N-Doped TiO2 under Visible Light Irradiation","volume":"255","author":"Chen","year":"2008","journal-title":"J. Catal."},{"key":"ref_79","doi-asserted-by":"crossref","unstructured":"Kovalevskiy, N., Cherepanova, S., Gerasimov, E., Lyulyukin, M., Solovyeva, M., Prosvirin, I., Kozlov, D., and Selishchev, D. (2022). Enhanced Photocatalytic Activity and Stability of Bi2WO6\u2014TiO2-N Nanocomposites in the Oxidation of Volatile Pollutants. Nanomaterials, 12.","DOI":"10.3390\/nano12030359"},{"key":"ref_80","doi-asserted-by":"crossref","first-page":"644","DOI":"10.1016\/j.mencom.2021.09.017","article-title":"Cu-Grafted TiO2 Photocatalysts: Effect of Cu on the Action Spectrum of Composite Materials","volume":"31","author":"Kovalevskiy","year":"2021","journal-title":"Mendeleev Commun."},{"key":"ref_81","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/0039-6028(73)90206-9","article-title":"ESCA Studies of Cu, Cu2O and CuO","volume":"35","author":"Schon","year":"1973","journal-title":"Surf. Sci."},{"key":"ref_82","doi-asserted-by":"crossref","first-page":"8542","DOI":"10.1016\/j.apsusc.2011.05.012","article-title":"Investigation of Oxygen States and Reactivities on a Nanostructured Cupric Oxide Surface","volume":"257","author":"Svintsitskiy","year":"2011","journal-title":"Appl. Surf. Sci."},{"key":"ref_83","unstructured":"Moulder, J.F., Stickle, W.F., Sobol, P.E., and Bomben, K.D. (1992). Handbook of X-ray Photoelectron Spectroscopy, Perkin-Elmer Corp."},{"key":"ref_84","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1002\/pssb.19680300207","article-title":"ESR Studies of Cupric Ion in Various Oxide Glasses","volume":"30","author":"Imagawa","year":"1968","journal-title":"Phys. Status Solidi"},{"key":"ref_85","doi-asserted-by":"crossref","first-page":"500","DOI":"10.1007\/s10720-005-0005-0","article-title":"Electron Paramagnetic Resonance of Color Centers in Nanoporous Glasses Impregnated with Copper Beta-Diketonate with the Use of Supercritical Carbon Dioxide","volume":"30","author":"Bagratashvili","year":"2004","journal-title":"Glass Phys. Chem."},{"key":"ref_86","doi-asserted-by":"crossref","first-page":"9996","DOI":"10.1021\/la301684h","article-title":"Effect of Ti3+ on TiO2-Supported Cu Catalysts Used for CO Oxidation","volume":"28","author":"Chen","year":"2012","journal-title":"Langmuir"},{"key":"ref_87","doi-asserted-by":"crossref","unstructured":"Endo-Kimura, M., Karabiyik, B., Wang, K., Wei, Z., Ohtani, B., Markowska-Szczupak, A., and Kowalska, E. (2020). Vis-Responsive Copper-Modified Titania for Decomposition of Organic Compounds and Microorganisms. Catalysts, 10.","DOI":"10.3390\/catal10101194"},{"key":"ref_88","doi-asserted-by":"crossref","first-page":"14900","DOI":"10.1021\/jp3020657","article-title":"Photocatalytic Reaction Mechanism of Fe(III)-Grafted TiO2 Studied by Means of ESR Spectroscopy and Chemiluminescence Photometry","volume":"116","author":"Nishikawa","year":"2012","journal-title":"J. Phys. Chem. C"},{"key":"ref_89","doi-asserted-by":"crossref","first-page":"10064","DOI":"10.1021\/ja401541k","article-title":"Energy-Level Matching of Fe(III) Ions Grafted at Surface and Doped in Bulk for Efficient Visible-Light Photocatalysts","volume":"135","author":"Liu","year":"2013","journal-title":"J. Am. Chem. Soc."},{"key":"ref_90","doi-asserted-by":"crossref","first-page":"16481","DOI":"10.1021\/jp1071956","article-title":"An Efficient Visible-Light-Sensitive Fe(III)-Grafted TiO2 Photocatalyst","volume":"114","author":"Yu","year":"2010","journal-title":"J. Phys. Chem. C"},{"key":"ref_91","doi-asserted-by":"crossref","first-page":"L11","DOI":"10.1016\/S0926-3373(00)00145-4","article-title":"The investigation of mechanism of SCR reaction on a TiO2-SO42\u2212 catalyst by DRIFTS","volume":"27","author":"Jung","year":"2000","journal-title":"Appl. Catal. B"},{"key":"ref_92","doi-asserted-by":"crossref","first-page":"126","DOI":"10.1016\/j.apcatb.2009.03.001","article-title":"Products distribution during the gas phase photocatalytic oxidation of ammonia over the various titania based photocatalysts","volume":"90","author":"Kolinko","year":"2009","journal-title":"Appl. Catal. B."},{"key":"ref_93","doi-asserted-by":"crossref","first-page":"3637","DOI":"10.1039\/C9CY00466A","article-title":"The promoting effect of visible light on the CO + NO reaction over the Pd\/N\u2013TiO2 catalyst","volume":"9","author":"Tan","year":"2019","journal-title":"Catal. Sci. Technol."},{"key":"ref_94","doi-asserted-by":"crossref","first-page":"243","DOI":"10.1016\/S0166-9834(00)81564-X","article-title":"Fourier transform infrared study of the adsorption and coadsorption of nitric oxide, nitrogen dioxide and ammonia on TiO2 anatase","volume":"64","author":"Ramis","year":"1990","journal-title":"Appl. Catal."},{"key":"ref_95","doi-asserted-by":"crossref","first-page":"582","DOI":"10.1016\/j.apcatb.2013.09.016","article-title":"The role of cerium in the improved SO2 tolerance for NO reduction with NH3 over Mn-Ce\/TiO2 catalyst at low temperature","volume":"148\u2013149","author":"Jin","year":"2014","journal-title":"Appl. Catal. B."},{"key":"ref_96","doi-asserted-by":"crossref","unstructured":"Kamaei, M., Rashedi, H., Dastgheib, S.M.M., and Tasharrofi, S. (2018). Comparing Photocatalytic Degradation of Gaseous Ethylbenzene Using N-doped and Pure TiO2 Nano-Catalysts Coated on Glass Beads under Both UV and Visible Light Irradiation. Catalysts, 8.","DOI":"10.3390\/catal8100466"},{"key":"ref_97","doi-asserted-by":"crossref","first-page":"309","DOI":"10.1016\/j.apcatb.2006.02.016","article-title":"Nitrogen-containing TiO2 photocatalysts: Part 2. Photocatalytic behavior under sunlight excitation","volume":"65","author":"Belver","year":"2006","journal-title":"Appl. Catal. B: Environ."},{"key":"ref_98","doi-asserted-by":"crossref","first-page":"115019","DOI":"10.1088\/2053-1591\/ab44f2","article-title":"Facile synthesis of nitrogen-doped titanium dioxide with enhanced photocatalytic properties","volume":"6","author":"Li","year":"2019","journal-title":"Mater. Res. Express"},{"key":"ref_99","doi-asserted-by":"crossref","first-page":"223","DOI":"10.1016\/j.apcatb.2004.11.008","article-title":"Photocatalytic degradation of phenol in aqueous nitrogen-doped TiO2 suspensions with various light sources","volume":"57","author":"Wang","year":"2005","journal-title":"Appl. Catal. B: Environ."},{"key":"ref_100","doi-asserted-by":"crossref","first-page":"5301","DOI":"10.1039\/c0jm00376j","article-title":"Preparation of highly visible-light active N-doped TiO2 photocatalyst","volume":"20","author":"Yang","year":"2010","journal-title":"J. Mater. Chem."},{"key":"ref_101","doi-asserted-by":"crossref","first-page":"2157","DOI":"10.1007\/s11434-007-0306-x","article-title":"Visible light photocatalytic decoloration of methylene blue on novel N-doped TiO2","volume":"52","author":"Wang","year":"2007","journal-title":"Chin. Sci. Bull."},{"key":"ref_102","doi-asserted-by":"crossref","unstructured":"Khan, T.T., Bari, G.A.K.M.R., Kang, H.J., Lee, T.G., Park, J.W., Hwang, H.J., Hossain, S.M., Mun, J.S., Suzuki, N., and Fujishima, A. (2021). Synthesis of N-Doped TiO2 for Efficient Photocatalytic Degradation of Atmospheric NOx. Catalysts, 11.","DOI":"10.3390\/catal11010109"},{"key":"ref_103","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1155\/2014\/724910","article-title":"Sol-gel to prepare nitrogen doped TiO2 nanocrystals with exposed {001} facets and high visible-light photocatalytic performance","volume":"2014","author":"Ai","year":"2014","journal-title":"Int. J. Photoenergy"},{"key":"ref_104","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1007\/s11051-006-9141-2","article-title":"Preparation of N-doped TiO2 photocatalyst by atmospheric pressure plasma process for VOCs decomposition under UV and visible light sources","volume":"9","author":"Chen","year":"2006","journal-title":"J. Nanoparticle Res."},{"key":"ref_105","doi-asserted-by":"crossref","first-page":"24006","DOI":"10.1016\/j.ijhydene.2017.08.009","article-title":"Self-assembled ionic liquid synthesis of nitrogen-doped mesoporous TiO2 for visible-light-responsive hydrogen production","volume":"42","author":"Liu","year":"2017","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_106","doi-asserted-by":"crossref","first-page":"125743","DOI":"10.1016\/j.colsurfa.2020.125743","article-title":"Simple preparation of nitrogen-doped TiO2 and its performance in selective oxidation of benzyl alcohol and benzylamine under visible light","volume":"610","author":"Japa","year":"2020","journal-title":"Colloids Surfaces A: Physicochem. Eng. Asp."},{"key":"ref_107","doi-asserted-by":"crossref","first-page":"4084","DOI":"10.1039\/b816708g","article-title":"Preparation of N-doped TiO2: Characterization and photocatalytic performance under UV and visible light","volume":"11","author":"Bellardita","year":"2009","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_108","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1016\/j.jcis.2009.02.017","article-title":"Synthesis of mesoporous TiO2\u2212xNx spheres by template free homogeneous co-precipitation method and their photo-catalytic activity under visible light illumination","volume":"333","author":"Parida","year":"2009","journal-title":"J. Colloid Interface Sci."},{"key":"ref_109","doi-asserted-by":"crossref","first-page":"2441","DOI":"10.1016\/j.apsusc.2007.09.063","article-title":"Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials","volume":"254","author":"Yamashita","year":"2008","journal-title":"Appl. Surf. Sci."}],"container-title":["Nanomaterials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2079-4991\/12\/23\/4146\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:25:15Z","timestamp":1760145915000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2079-4991\/12\/23\/4146"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,11,23]]},"references-count":109,"journal-issue":{"issue":"23","published-online":{"date-parts":[[2022,12]]}},"alternative-id":["nano12234146"],"URL":"https:\/\/doi.org\/10.3390\/nano12234146","relation":{},"ISSN":["2079-4991"],"issn-type":[{"value":"2079-4991","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,11,23]]}}}