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High phosphate removal using La(OH)3 loaded chitosan based composites and mechanistic study

Journal of Environmental Sciences 2021年第8期33卷 105-115页

作者： Shaopeng Zhang Yi Zhang Jie Ding Zepeng Zhang Chao Gao Muslim Halimi Hary Demey Zhen Yang Weiben Yang School of Chemistry and Materials Science Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution ControlNanjing Normal UniversityNanjing 210023China Department of Chemical and Environmental Engineering Anyang Institute of TechnologyAnyang 455000China Department of Chemical Engineering Universitat Politècnica de CatalunyaBarcelona 08028Spain

Our present study was to prepare a biomass-supported adsorbents with high adsorptive capacity and high selectivity to prevent the accelerated eutrophication in water *** this end,different metal hydroxide(La,Zr and Fe)first was successfully loaded on chitosan *** the quaternary ammonium group with different content was introduced into the adsorbent by *** comparison of adsorption properties,chitosanLa(OH)3-quaternary ammonium-20%(CS-La-N-20%)has strong adsorption to phosphate(160 mg/g)by immobilizing nano-sized La(OH)3 within a quaternary-aminated chitosan and it maintain high adsorption in the presence of salt *** pH results indicated that the CS-La-N-20%would effectively sequestrate phosphate over a wide pH range between 3 and 7 without significant La3+***’s more,adsorption capacity on the introduce of positively charged quanternary-aminated groups was significantly higher than that of the unmodified adsorbents at alkaline *** column adsorption capacity reached 1300 bed volumes(BV)when phosphate concentration decreased until 0.5 mg/L at 6 BV/*** column adsorption/desorption reveals that no significant capacity loss is observed,indicating excellent stability and repeated use *** revealed that phosphate adsorption on CS-La-N-20%through ligand exchange(impregnated nano-La(OH)3)and electrostatic attraction(positively charged quanternary-aminated groups).All the results suggested that CS-La-N-20%can serve as a promising adsorbent for preferable phosphate removal in realistic application.

关键词： Phosphate chitosan-nanocomposite Metal hydroxide Quaternary ammonium

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