{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T05:03:08Z","timestamp":1787029388790,"version":"build-2736575974"},"reference-count":52,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2020,4,20]],"date-time":"2020-04-20T00:00:00Z","timestamp":1587340800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>The paper presents an original study on adsorption and aggregation phenomena in a mixed system consisting of a macromolecular compound, heavy metal ions and an innovative adsorbent. The authors used ionic polyacrylamides (PAM), Cu(II) ions and carbon\u2013silica composite (C-SiO2) in the experiments. Such a system has not yet been described in the literature and therefore, the article is of significant novelty and great importance. The composite was prepared by mixing phenol\u2013formaldehyde resin with silica and pyrolysis at 800 \u00b0C. The adsorbed amounts of Cu(II) ions and PAM were determined spectrophotometrically. C-SiO2 was characterized using potentiometric titration, microelecrophoresis and Fourier Transform Infrared Spectroscopy (FTIR) analysis. In turn, the C-SiO2 aggregation was established turbidimetrically as well as using a particle size analyzer. The obtained results indicated that both Cu(II) ions and ionic polyacrylamide were adsorbed on the composite surface at pH 6. The highest noted adsorbed amounts were 9.8 mg\/g for Cu(II) and 35.72 mg\/g for CT PAM-25%. Cu(II) ions increased the anionic PAM adsorbed and reduced the cationic PAM one. The adsorption of anionic PAM (50 ppm) stimulated the solid aggregation significantly. What is more, Cu(II) ions enhanced this process. The size of particles\/aggregates formed without additives equaled 0.44 \u03bcm, whereas in the mixed Cu(II)\/AN PAM system, they were even at 1.04 \u03bcm.<\/jats:p>","DOI":"10.3390\/polym12040961","type":"journal-article","created":{"date-parts":[[2020,4,21]],"date-time":"2020-04-21T05:48:52Z","timestamp":1587448132000},"page":"961","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Study on Adsorption and Aggregation in the Mixed System of Polyacrylamide, Cu(II) Ions and Innovative Carbon\u2013Silica Composite"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8682-3491","authenticated-orcid":false,"given":"Katarzyna","family":"Szewczuk-Karpisz","sequence":"first","affiliation":[{"name":"Institute of Agrophysics, Polish Academy of Sciences, Do\u015bwiadczalna 4, 20-290 Lublin, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Viktor M.","family":"Bogatyrov","sequence":"additional","affiliation":[{"name":"O.O. Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, General Naumov Street 17, 03164 Kiev, Ukraine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9784-1348","authenticated-orcid":false,"given":"Mariia","family":"Galaburda","sequence":"additional","affiliation":[{"name":"O.O. Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, General Naumov Street 17, 03164 Kiev, Ukraine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2309-0785","authenticated-orcid":false,"given":"Zofia","family":"Soko\u0142owska","sequence":"additional","affiliation":[{"name":"Institute of Agrophysics, Polish Academy of Sciences, Do\u015bwiadczalna 4, 20-290 Lublin, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,20]]},"reference":[{"key":"ref_1","unstructured":"O\u015bcik, J. (1969). Adsorption, UMCS. (In Polish)."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1016\/j.surfcoat.2013.04.028","article-title":"An overview of protein adsorption on metal oxide coatings for biomedical implants","volume":"233","author":"Rodil","year":"2013","journal-title":"Surf. Coat. Technol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"3657","DOI":"10.1007\/s11356-012-1273-6","article-title":"Removal possibilities of colloidal chromium(III) oxide from water using polyacrylic acid","volume":"20","year":"2013","journal-title":"Env. Sci. Pollut. Res."},{"key":"ref_4","first-page":"135","article-title":"Potential role of soil in the transmission of prion disease","volume":"64","author":"Schramm","year":"2006","journal-title":"Geochemistry"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Kojima, C., and Watanabe, K. (2012). Adsorption and desorption of bioactive proteins on hydroxyapatite for protein delivery systems. J. Drug Deliv., 932461.","DOI":"10.1155\/2012\/932461"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"407","DOI":"10.1016\/S0894-1777(96)00142-2","article-title":"Fouling of heat exchangers in the dairy industry","volume":"14","author":"Visser","year":"1997","journal-title":"Exp. Therm. Fluid Sci."},{"key":"ref_7","first-page":"1625","article-title":"Adsorption, chemisorptions, and catalysis","volume":"68","year":"2014","journal-title":"Chem. Pap."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"110900","DOI":"10.1016\/j.molliq.2019.110900","article-title":"Adsorption characteristics of molecular oxytetracycline onto alumina particles: The role of surface modification with an anionic surfactant","volume":"287","author":"Pham","year":"2019","journal-title":"J. Mol. Liq."},{"key":"ref_9","first-page":"1","article-title":"Adsorption of anionic surfactants onto alumina: Characteristics, mechanisms, and application for heavy metal removal","volume":"2830286","author":"Nguyen","year":"2018","journal-title":"Int. J. Polymer Sci."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1007\/s00396-018-4433-5","article-title":"Adsorption of poly(styrenesulfonate) onto different-sized alumina particles: Characteristics and mechanisms","volume":"297","author":"Pham","year":"2019","journal-title":"Colloid Polymer Sci."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Pham, T.D., Bui, T.T., Nguyen, V.T., Bui, T.K.V., Tran, T.T., Phan, Q.C., Pham, T.D., and Hoang, T.H. (2018). Adsorption of polyelectrolyte onto nanosilica synthesized from rice husk: Characteristics, mechanisms, and applications for antibiotic removal. Polymers, 10.","DOI":"10.3390\/polym10020220"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"111981","DOI":"10.1016\/j.molliq.2019.111981","article-title":"Adsorption characteristics of beta-lactam cefixime onto nanosilica fabricated from rice HUSK with surface modification by polyelectrolyte","volume":"298","author":"Pham","year":"2020","journal-title":"J. Mol. Liq."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Pham, T.D., Vu, T.N., Nguyen, H.L., Le, P.H.P., and Hoang, T.S. (2020). Adsorptive removal of antibiotic ciprofloxacin from aqueous solution using protein-modified nanosilica. Polymers, 12.","DOI":"10.3390\/polym12010057"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"112456","DOI":"10.1016\/j.molliq.2020.112456","article-title":"Adsorption characteristics of anionic surfactant onto laterite soil with differently charged surfaces and application for cationic dye removal","volume":"301","author":"Pham","year":"2020","journal-title":"J. Mol. Liq."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"4899","DOI":"10.1007\/s13762-019-02227-4","article-title":"Biochar efficiency in copper removal from Haplic soils","volume":"16","author":"Tomczyk","year":"2019","journal-title":"Int. J. Env. Sci. Technol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"2095","DOI":"10.1021\/acs.energyfuels.6b02921","article-title":"Utilization of fly ashes from the coal burning processes to produce effective low-cost sorbents","volume":"31","author":"Adamczuk","year":"2017","journal-title":"Energ. Fuel."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"200","DOI":"10.1016\/j.cej.2015.03.088","article-title":"Equilibrium, thermodynamic and kinetic studies on removal of chromium, copper, zinc and arsenic from aqueous solutions onto fly ash coated by chitosan","volume":"274","author":"Adamczuk","year":"2015","journal-title":"Chem. Eng. J."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"208","DOI":"10.1016\/j.cej.2014.03.052","article-title":"Hydrogen sulphide removal on carbonaceous adsorbents prepared from coffee waste materials","volume":"248","author":"Nowicki","year":"2014","journal-title":"Chem. Eng. J."},{"key":"ref_19","first-page":"578","article-title":"Physicochemical and adsorption properties of carbonaceous sorbents prepared by activation of tropi cal fruit skins with potassium carbonate","volume":"90","author":"Nowicki","year":"2016","journal-title":"Mater. Design"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"122079","DOI":"10.1016\/j.jhazmat.2020.122079","article-title":"Facile fabrication of silver iodide\/graphitic carbon nitride nanocomposites by notable photo-catalytic performance through sunlight and antimicrobial activity","volume":"389","author":"Orooji","year":"2020","journal-title":"J. Hazard. Mater."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Orooji, Y., Ghasali, E., Emami, N., Noorisafa, F., and Razmjou, A. (2019). ANOVA design for the optimalization of TiO2 coating on polyether sulfone membranes. Molecules, 24.","DOI":"10.3390\/molecules24162924"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Irani-nezhad, M.H., Khataee, A., Hassanzadeh, J., and Orooji, Y. (2019). A chemiluminescent method for the detection of H2O2 on intrinsic peroxidase-like activity of WS2 quantum dots. Molecules, 24.","DOI":"10.3390\/molecules24040689"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"200","DOI":"10.1016\/j.jhazmat.2019.05.035","article-title":"Hirarchically structured ternary heterojunctions based on Ce3+\/Cr4+ modified Fe3O4 nanoparticles anchored onto graphene oxide sheets as magnetic visible-light-active photocatalysts for decontamination of oxytetracycline","volume":"376","author":"Hassandoost","year":"2019","journal-title":"J. Hazard. Mater."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"112040","DOI":"10.1016\/j.molliq.2019.112040","article-title":"The role of magnetite\/grapheme oxide nanocomposite as a high-efficiency adsorbent for removal of phenazopyridine residues from water samples, an experimental\/theoretical investigation","volume":"298","author":"Shafieizadeh","year":"2020","journal-title":"J. Mol. Liq."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"4391","DOI":"10.1039\/C3TA14604A","article-title":"Porous magnetic carbon sheets from biomass as an adsorbent for the fast removal of organic pollutants from aqueous solution","volume":"2","author":"Zhang","year":"2014","journal-title":"J. Mater. Chem. A"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1101","DOI":"10.1007\/s13762-019-02546-6","article-title":"Anionic polyacrylamide as a substance strengthening the Pb(II) immobilization on the kaolinite surface","volume":"17","year":"2020","journal-title":"Int. J. Env. Technol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"111514","DOI":"10.1016\/j.molliq.2019.111514","article-title":"Chromium(VI) and lead(II) accumulation at the montmorillonite\/aqueous solution interface in the presence of polyacrylamide containing quaternary amine groups","volume":"293","year":"2019","journal-title":"J. Mol. Liq."},{"key":"ref_28","first-page":"124179","article-title":"Peat-based activated carbons as adsorbents for simultaneous separation of organic molecules from mixed solution of poly(acrylic acid) polymer and sodium dodecyl sulfate surfactant","volume":"585","author":"Nowicki","year":"2019","journal-title":"Colloid. Surf. A."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"111806","DOI":"10.1016\/j.molliq.2019.111806","article-title":"Simultaneous removal of lead(II) ions and poly(acrylic acid) macromolecules from liquid phase using biocarbons obtained from corncob and peanut shell precursors","volume":"296","author":"Nowicki","year":"2019","journal-title":"J. Mol. Liq."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"126312","DOI":"10.1016\/j.chemosphere.2020.126312","article-title":"Hay-based activated biochars obtained using two different heating methods as effective low-cost sorbents: Solid surface charactristics, adsorptive properties and aggregation in the mixed Cu(II)\/PAM system","volume":"250","author":"Nowicki","year":"2020","journal-title":"Chemosphere"},{"key":"ref_31","unstructured":"Janusz, W. (1999). Electrical double layer at metal oxide-electrolyte interface. Interfacial Forces and Fields Theory and Applications, M. Dekker."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1006\/jcis.1994.1419","article-title":"A simple expansion for Henry\u2019s function for the retardation effect in electrophoresis of spherical colloidal particles","volume":"168","author":"Oshima","year":"1994","journal-title":"J. Colloid Interface Sci."},{"key":"ref_33","unstructured":"Minczewski, J., and Marczenko, Z. (1965). Analytical Chemistry, PWN."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1902","DOI":"10.2134\/jeq2013.07.0279","article-title":"Turbidimetric determination of anionic polyacrylamide in low biochar soil extracts","volume":"42","author":"Kang","year":"2013","journal-title":"J. Environ. Qual."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"533","DOI":"10.1021\/i560096a006","article-title":"Colorimetric determination of copper with ammonia","volume":"13","author":"Mehlig","year":"1941","journal-title":"Ind. Eng. Chem. Anal. Ed."},{"key":"ref_36","first-page":"31","article-title":"Effect of Co(II) ions adsorption in the hydroxyapatite\/aqueous NaClO4 solution system in particles electrokinetics","volume":"54","author":"Janusz","year":"2018","journal-title":"Physicochem. Probl. Mi."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"507","DOI":"10.1177\/0263617417698966","article-title":"The influence of the hydroxyapatite synthesis method on the electrochemical, surface and adsorption properties of hydroxyapatite","volume":"35","author":"Skwarek","year":"2017","journal-title":"Adsorption Sci. Technol."},{"key":"ref_38","first-page":"81","article-title":"Infrared spectroscopy study of silicone oil C-Si stretching vibration","volume":"30","author":"Chang","year":"2016","journal-title":"Mater. Rev."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"12641","DOI":"10.1016\/j.ceramint.2017.06.144","article-title":"Alkaline activation of metakaolinite-silica mixtures: Role of dissolved silica concentration on the formation of geopolymers","volume":"43","author":"Gild","year":"2017","journal-title":"Ceramics Int."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"118272","DOI":"10.1016\/j.saa.2020.118272","article-title":"Cerium doped magnetite nanoparticles for highly sensitive detection of metronidazole via chemiluminescence assay","volume":"234","author":"Orooji","year":"2020","journal-title":"Spectrochim. Acta A"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1006\/jcis.1999.6312","article-title":"Polyacrylamide at soli\/liquid interfaces","volume":"216","author":"Pefferkorn","year":"1999","journal-title":"J. Colloid Interface Sci."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"524","DOI":"10.1016\/j.chemosphere.2018.07.198","article-title":"The mechanism of anionic polyacrylamide adsorption on montmorillonite surface in the presence of Cr(VI) ions","volume":"211","year":"2018","journal-title":"Chemosphere"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1511","DOI":"10.1007\/s00396-016-3906-7","article-title":"Impact of anionic polyacrylamide on stability and surface properties of the Al2O3-polymer solution system at different temperatures","volume":"294","author":"Chibowski","year":"2016","journal-title":"Colloid. Polym. Sci."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"815","DOI":"10.1016\/j.jhazmat.2014.10.037","article-title":"Impact of polyacrylamide with different contents of carboxyl groups on the chromium(III) oxide adsorption properties in aqueous solution","volume":"283","author":"Chibowski","year":"2015","journal-title":"J. Hazard. Mater."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"31092","DOI":"10.1039\/C6RA02308H","article-title":"Investigation into the adsorption of partially hydrolyzed polyacrylamide onto in situ formed magnesium hydroxide particles","volume":"6","author":"Li","year":"2016","journal-title":"RSC Adv."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"54","DOI":"10.1016\/j.jcis.2005.10.037","article-title":"An in situ ATR-FTIR study of polyacrylamide adsorption at the talc surface","volume":"297","author":"Chiem","year":"2006","journal-title":"J. Colloid Interface Sci."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1016\/j.jece.2015.11.022","article-title":"Copper(II) removal potential from aqueous solution by pyrolysis biochar derived from anaerobically digested algae-dairy-manure and effect of KOH activation","volume":"4","author":"Jin","year":"2016","journal-title":"J. Environ. Chem. Eng."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1016\/j.biortech.2015.08.055","article-title":"Effect of steamactivation of biochar produced from a giant Miscanthus on copper sorption and toxicity","volume":"197","author":"Shim","year":"2015","journal-title":"Bioresour. Technol."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"777","DOI":"10.1016\/j.scitotenv.2019.04.085","article-title":"Removal of copper ions from aqueous solution using low temperature biochar derived from the pyrolysis of municipal solid waste","volume":"673","author":"Hoslett","year":"2019","journal-title":"Sci. Total Environ."},{"key":"ref_50","unstructured":"Chhabra, R., and Basavaraj, M.G. (2019). Coulson and Richardson\u2019s Chemical Engineering, Elsevier. Volume 2a: Particulate Systems and Particle Technology, Chapter 13: Colloidal Dispersions."},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Wi\u015bniewska, M. (2018). Polyacrylamide (Chapter 4) In High Performance Polymers and Their Nanocomposites, Wiley Online Library.","DOI":"10.1002\/9781119363910.ch4"},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Birdi, K.S. (2003). Handbook of Surface and Colloid Chemistry, CRS Press. [2nd ed.].","DOI":"10.1201\/9781420040944"}],"container-title":["Polymers"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4360\/12\/4\/961\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:21:33Z","timestamp":1760361693000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4360\/12\/4\/961"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,4,20]]},"references-count":52,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2020,4]]}},"alternative-id":["polym12040961"],"URL":"https:\/\/doi.org\/10.3390\/polym12040961","relation":{},"ISSN":["2073-4360"],"issn-type":[{"value":"2073-4360","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,4,20]]}}}