{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T02:17:05Z","timestamp":1788401825589,"version":"build-2803163510"},"reference-count":52,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2025,9,16]],"date-time":"2025-09-16T00:00:00Z","timestamp":1757980800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Science and Technology of Taiwan","award":["NSTC-114-2113-M-142-002"],"award-info":[{"award-number":["NSTC-114-2113-M-142-002"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Perovskite-type CaBiO2Cl with a unique layered Sillen X1 structure exhibits great potential as an efficient visible-light photocatalyst. In this study, CaBiO2Cl was synthesized through calcination at 800 \u00b0C and subsequently composited with varying amounts of g-C3N4 to optimize photocatalytic performance. The prepared catalysts were characterized by multiple techniques to confirm their structural and compositional features. Under visible-light irradiation, the photocatalytic activities toward Rh6G degradation were systematically evaluated using UV\u2013vis PDA and EPR analyses. To further elucidate the degradation mechanism, radical scavenger experiments were conducted to identify the reactive species generated during the photodegradation process. Kinetic analysis revealed that the reaction rate constant (k) of pure CaBiO2Cl was 0.0525 h\u22121, while that of pure g-C3N4 was 0.0423 h\u22121. Notably, the CaBiO2Cl\/10 wt% g-C3N4 composite exhibited an enhanced k value of 0.0568 h\u22121, which is 1.1 and 1.3 times higher than those of CaBiO2Cl and g-C3N4, respectively. Furthermore, under ambient conditions (25 \u00b0C, 1 atm), the CO2-to-CH4 photocatalytic conversion efficiency of the CaBiO2Cl\/10 wt% g-C3N4 composite reached 0.5652 \u03bcmol g\u22121 h\u22121. These findings demonstrate that CaBiO2Cl-based composite photocatalysts not only achieve superior visible-light photocatalytic activity but also exhibit excellent stability, highlighting their potential for environmental remediation and alignment with the principles of green chemistry.<\/jats:p>","DOI":"10.3390\/molecules30183760","type":"journal-article","created":{"date-parts":[[2025,9,16]],"date-time":"2025-09-16T11:19:31Z","timestamp":1758021571000},"page":"3760","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Visible-Light-Driven Photocatalysis of Carbon Dioxide and Organic Pollutants by CaBiO2Cl\/g-C3N4"],"prefix":"10.3390","volume":"30","author":[{"given":"Yu-Yun","family":"Lin","sequence":"first","affiliation":[{"name":"Department of Science Education and Application, National Taichung University of Education, Taichung 403514, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo-Heng","family":"Huang","sequence":"additional","affiliation":[{"name":"Department of Science Education and Application, National Taichung University of Education, Taichung 403514, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wen-Yu","family":"You","sequence":"additional","affiliation":[{"name":"Department of Science Education and Application, National Taichung University of Education, Taichung 403514, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fu-Yu","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Science Education and Application, National Taichung University of Education, Taichung 403514, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia-Hao","family":"Lin","sequence":"additional","affiliation":[{"name":"Department of Science Education and Application, National Taichung University of Education, Taichung 403514, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7926-1411","authenticated-orcid":false,"given":"Chiing-Chang","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Science Education and Application, National Taichung University of Education, Taichung 403514, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"100155","DOI":"10.1016\/j.scenv.2024.100155","article-title":"A review of photocatalysis, basic principles, processes, and materials","volume":"8","author":"Chakravorty","year":"2024","journal-title":"Sustain. Chem. Environ."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1228","DOI":"10.1016\/j.scib.2021.02.007","article-title":"Engineering two-dimensional metal oxides and chalcogenides for enhanced electro- and photocatalysis","volume":"66","author":"Wang","year":"2021","journal-title":"Sci. Bull."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"2408213","DOI":"10.1002\/adfm.202408213","article-title":"The role of point defects in heterojunction photocatalysts: Perspectives and outlooks","volume":"34","author":"Zu","year":"2024","journal-title":"Adv. Funct. Mater"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"179","DOI":"10.1016\/j.jphotochemrev.2011.02.003","article-title":"Recent progress on photocatalytic and photoelectrochemical water splitting under visible light irradiation","volume":"11","author":"Abe","year":"2010","journal-title":"J. Photochem. Photobiol. C Photochem. Rev."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"6301","DOI":"10.1021\/acsanm.4c06675","article-title":"Revisiting microstructure, facet exposure, and lattice distortion in bismuth oxyhalide (BiOX, X = Cl, Br, I) nanomaterials for catalysis","volume":"8","author":"Marks","year":"2025","journal-title":"ACS Appl. Nano Mater."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"5079","DOI":"10.1039\/D3NR06559F","article-title":"Potential application of bismuth oxyiodide (BiOI) when it meets light","volume":"16","author":"Sun","year":"2024","journal-title":"Nanoscale"},{"key":"ref_7","first-page":"101115","article-title":"BiOX (X = Cl, Br, I)-based S-scheme heterostructure photocatalysts for environmental remediation and energy conversion","volume":"30","author":"Yusuf","year":"2025","journal-title":"Mater. Today Sustain."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1016\/j.solmat.2016.11.040","article-title":"Sunlight responsive new Sill\u00e9n-Aurivillius A1X1 hybrid layered oxyhalides with enhanced photocatalytic activity","volume":"161","author":"Pandey","year":"2017","journal-title":"Sol. Energy Mater. Sol. Cells"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"7582","DOI":"10.1021\/acs.inorgchem.6b01024","article-title":"ABiO2X (A = Cd, Ca, Sr, Ba, Pb; X = halogen) Sillen X1 series: Polymorphism versus optical properties","volume":"55","author":"Olchowka","year":"2016","journal-title":"Inorg. Chem."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"316","DOI":"10.1016\/S0022-4596(03)00297-4","article-title":"A reinvestigation of quaternary layered bismuth oxyhalides of the Sill\u00e9n X1 type","volume":"175","author":"Charkin","year":"2003","journal-title":"J. Solid State Chem."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"15159","DOI":"10.1039\/D3TA00906H","article-title":"A Sill\u00e9n oxyhalide SrBi3O4Cl3 as a promising photocatalyst for water splitting: Impact of the asymmetric structure on light absorption and charge carrier dynamics","volume":"11","author":"Suzuki","year":"2023","journal-title":"J. Mater. Chem. A"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"6257","DOI":"10.1039\/c2ce25672j","article-title":"High photocatalytic activity of oxychloride CaBiO2Cl under visible light irradiation","volume":"14","author":"Shi","year":"2012","journal-title":"CrystEngComm"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1006\/jssc.1996.7183","article-title":"Synthesis and structure of CaBiO2Cl and SrBiO2Cl: New distorted variants of the Sillen X1 structure","volume":"128","author":"Fray","year":"1997","journal-title":"J. Solid State Chem."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"77","DOI":"10.1016\/j.cplett.2017.01.002","article-title":"Insulin adsorption on crystalline SiO2: Comparison between polar and nonpolar surfaces using accelerated molecular-dynamics simulations","volume":"670","author":"Nejad","year":"2017","journal-title":"Chem. Phys. Lett."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"146590","DOI":"10.1016\/j.scitotenv.2021.146590","article-title":"Plastic wastes biodegradation: Mechanisms, challenges and future prospects","volume":"780","author":"Ali","year":"2021","journal-title":"Sci. Total Environ."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"393","DOI":"10.1016\/j.matpr.2023.07.147","article-title":"A review of the photocatalysis process used for wastewater treatment","volume":"102","author":"Mishra","year":"2024","journal-title":"Mater. Today Proc."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"3562","DOI":"10.1167\/iovs.02-1068","article-title":"Ocular drug delivery targeting the retina and retinal pigment epithelium using polylactide nanoparticles","volume":"44","author":"Bourges","year":"2003","journal-title":"Investig. Ophth. Vis. Sci."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"816","DOI":"10.1016\/j.procs.2013.05.246","article-title":"Computational study of the chemical reactivity properties of the Rhodamine B molecule","volume":"18","year":"2013","journal-title":"Procedia Comput. Sci."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"172370","DOI":"10.1016\/j.scitotenv.2024.172370","article-title":"Air pollution and climate change as grand challenges to sustainability","volume":"928","author":"Arshad","year":"2024","journal-title":"Sci. Total Environ."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"7601","DOI":"10.1021\/acs.jpcc.4c00720","article-title":"Highly efficient photocatalytic conversion of gasphase CO2 using bimetallic porphyrin-sensitized TiO2 nanotube arrays","volume":"128","author":"Xiao","year":"2024","journal-title":"J. Phys. Chem. C"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"32708","DOI":"10.1016\/j.ijhydene.2023.05.066","article-title":"Graphitic carbon nitride (g-C3N4) synthesis and heterostructures, principles, mechanisms, and recent advances: A critical review","volume":"48","author":"Molaei","year":"2023","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"104542","DOI":"10.1016\/j.arabjc.2023.104542","article-title":"Tuning of graphitic carbon nitride (g-C3N4) for photocatalysis: A critical review","volume":"16","author":"Wudil","year":"2023","journal-title":"Arab. J. Chem."},{"key":"ref_23","first-page":"100473","article-title":"Visible-light-driven photocatalysis of carbon dioxide by BiSeX and BiSeX\/g-C3N4 (X = Cl, Br, I)","volume":"23","author":"Lin","year":"2023","journal-title":"Mater. Today Sustain."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"106794","DOI":"10.1016\/j.catcom.2023.106794","article-title":"Fabrication and characterization of BiOxBry\/BiOmIn coupled GCN heterojunctions with enhanced visible-light catalytic activity","volume":"184","author":"Lu","year":"2023","journal-title":"Catal. Commun."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"e20879","DOI":"10.1016\/j.heliyon.2023.e20879","article-title":"Fabrication and characterization of ZnGa1.01Te2.13\/g-C3N4 heterojunction with enhanced photocatalytic activity","volume":"9","author":"Chen","year":"2023","journal-title":"Helyion"},{"key":"ref_26","first-page":"100430","article-title":"Photocatalytic CO2 reduction to C1\u2013C5 hydrocarbons using K2Fe2O4\/g-C3N4 as coupling photocatalyst","volume":"23","author":"Chen","year":"2023","journal-title":"Mater. Today Sustain."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"3336","DOI":"10.1002\/smll.201203135","article-title":"Cross-linked g-C3N4\/rGO nanocomposites with tunable band structure and enhanced visible light photocatalytic activity","volume":"9","author":"Li","year":"2013","journal-title":"Small"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"15399","DOI":"10.1021\/acsanm.2c03446","article-title":"Enhancement of g-C3N4 photocatalysis by selectively anchoring metal cocatalysts with a strong metal\u2013support interaction","volume":"5","author":"Huang","year":"2022","journal-title":"ACS Appl. Nano Mater."},{"key":"ref_29","first-page":"101069","article-title":"Graphitic carbon nitride (g\u2013C3N4)\u2013Based Z-scheme photocatalysts: Innovations for energy and environmental applications","volume":"29","author":"Basivi","year":"2025","journal-title":"Mater. Today Sustain."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"2938","DOI":"10.1039\/D5CY00022J","article-title":"Achieving high CH4 selectivity in CO2 photoreduction via S-type MoO3\/g-C3N4 heterojunction with Pt co-catalyst","volume":"15","author":"Wang","year":"2025","journal-title":"Catal. Sci. Technol."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"265","DOI":"10.1039\/D3SU00382E","article-title":"Graphitic carbon nitride (g-C3N4) as an emerging photocatalyst for sustainable environmental applications: A comprehensive review","volume":"2","author":"Bhanderi","year":"2024","journal-title":"RSC Sustain."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"20609","DOI":"10.1039\/D4RA03259D","article-title":"Photocatalytic systems: Reactions, mechanism, and applications","volume":"14","author":"Mohamadpour","year":"2024","journal-title":"RSC Adv."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"13487","DOI":"10.1016\/j.jece.2024.113487","article-title":"Recent advances on photocatalytic CO2 reduction using CeO2-based photocatalysts: A review","volume":"12","author":"Hoque","year":"2024","journal-title":"J. Environ. Chem. Eng."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"2359","DOI":"10.1021\/acsenergylett.5c00437","article-title":"Solar-fuel production by photodriven CO2 reduction: Facts, challenges, and recommendations","volume":"10","author":"Chakraborty","year":"2025","journal-title":"ACS Energy Lett."},{"key":"ref_35","first-page":"100263","article-title":"Developments and challenges on enhancement of photocatalytic CO2 reduction through photocatalysis","volume":"7","author":"Wang","year":"2024","journal-title":"Carbon Resour. Convers."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"6133","DOI":"10.1021\/acsanm.5c00363","article-title":"Nanosheet-stacked g-C3N4 tubes with carbon vacancies for enhanced photocatalytic H2 evolution","volume":"8","author":"Lu","year":"2025","journal-title":"ACS Appl. Nano Mater."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"22650","DOI":"10.1021\/acsomega.3c10521","article-title":"Structural, Optical, Electrical and photocatalytic investigation of n-Type Zn2+-Doped \u03b1-Bi2O3 nanoparticles for optoelectronics applications","volume":"9","author":"Khan","year":"2024","journal-title":"ACS Omega"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"111073","DOI":"10.1016\/j.materresbull.2020.111073","article-title":"Photocatalytic CO2 reduction over Nb2O5\/basic bismuth nitrate nanocomposites","volume":"133","author":"Oliveira","year":"2021","journal-title":"Mater. Res. Bull."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1016\/j.jhazmat.2014.09.035","article-title":"Enhanced visible-light photocatalytic activity of active Al2O3\/g-C3N4 heterojunctions synthesized via surface hydroxyl modification","volume":"283","author":"Li","year":"2015","journal-title":"J. Hazard. Mater."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"262","DOI":"10.1016\/j.apcatb.2018.11.054","article-title":"Hydroxyl decorated g-C3N4 nanoparticles with narrowed bandgap for high efficient photocatalyst design","volume":"244","author":"Wang","year":"2019","journal-title":"Appl. Catal. B Environ."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"737","DOI":"10.1007\/s00339-018-2161-9","article-title":"Electrochemical sensor for detection of mercury (II) ions in water using nanostructured bismuth hexagons","volume":"124","author":"Gupta","year":"2018","journal-title":"Appl. Phys. A"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1045","DOI":"10.1002\/asia.201800016","article-title":"Coupling of bifunctional CoMn-layered double hydroxide@graphitic-C3N4 nanohybrids towards efficient photoelectrochemical overall water splitting","volume":"13","author":"Arif","year":"2018","journal-title":"Chem.-Asian J."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"22819","DOI":"10.1039\/C9CP04573B","article-title":"Accurate K-edge X-ray photoelectron and absorption spectra of g-C3N4 nanosheets by first-principles simulations and reinterpretations","volume":"21","author":"Zhang","year":"2019","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"e202400343","DOI":"10.1002\/cptc.202400343","article-title":"Photocatalytic activity and stability of carbon nitride-pyrite composites","volume":"9","author":"Kaulbersch","year":"2025","journal-title":"ChemPhotoChem"},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Rahman, M.M., Muttakin, M., Pal, A., Shafiullah, A.Z., and Saha, B.B. (2019). A statistical approach to determine optimal models for IUPAC-Classified Adsorption Isotherms. Energies, 12.","DOI":"10.3390\/en12234565"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"132319","DOI":"10.1016\/j.seppur.2025.132319","article-title":"High selectivity of photocatalysis for CO2 conversion into hydrocarbons using potassium ferrate\/sulfur-doped graphitic-carbon nitride as catalyst","volume":"363","author":"Chen","year":"2025","journal-title":"Sep. Purification Technol."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"18358","DOI":"10.1039\/D4TA02377C","article-title":"Intrinsic bimetallic cations regulating band centers and reactive sites for boosting CO2 photoreduction","volume":"12","author":"Wang","year":"2024","journal-title":"J. Mater. Chem. A"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"117","DOI":"10.1016\/j.jphotochemrev.2019.02.002","article-title":"Catalysts in electro-, photo- and photoelectrocatalytic CO2 reduction reactions","volume":"40","author":"Wang","year":"2019","journal-title":"J. Photochem. Photobiol. C Photochem. Rev."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"124844","DOI":"10.1016\/j.apcatb.2024.124844","article-title":"Unveiling photochemical CO2 reduction processes on PbBiO2I\/GO surfaces: Insights from in situ Raman spectroscopy","volume":"364","author":"Liu","year":"2025","journal-title":"Appl. Catal. B Environ. Energy"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"3153","DOI":"10.1021\/acscatal.4c06401","article-title":"Probing photocatalytic reduction pathways of CO2 by catalyst PbBiO2Br using in-situ Raman spectroscopy","volume":"15","author":"Hsiao","year":"2025","journal-title":"ACS Catal."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"130992","DOI":"10.1016\/j.matchemphys.2025.130992","article-title":"Investigating the vibrational structures of lead bismuth oxyhalides PbBiO2X (X = Cl, Br, I) using temperature-dependent low-wavenumber Raman spectroscopy and the emission properties of the trapped states","volume":"342","author":"Wei","year":"2025","journal-title":"Mater. Chem. Phys."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"102858","DOI":"10.1016\/j.jcou.2024.102858","article-title":"Efficiency of CO2 photoreduction to hydrocarbons with K2Fe2O4\/rGO heterojunction as a photocatalyst","volume":"85","author":"Chen","year":"2024","journal-title":"J. CO2 Util."}],"container-title":["Molecules"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1420-3049\/30\/18\/3760\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T18:46:20Z","timestamp":1760035580000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1420-3049\/30\/18\/3760"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,9,16]]},"references-count":52,"journal-issue":{"issue":"18","published-online":{"date-parts":[[2025,9]]}},"alternative-id":["molecules30183760"],"URL":"https:\/\/doi.org\/10.3390\/molecules30183760","relation":{},"ISSN":["1420-3049"],"issn-type":[{"value":"1420-3049","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,9,16]]}}}