An, Byungryul Nam, Juhee Choi, Jae-Woo Hong, Seok-Won Lee, Sang-Hyup 2024-01-20T11:04:39Z 2024-01-20T11:04:39Z 2021-09-04 2013-11 0021-9797 https://pubs.kist.re.kr/handle/201004/127515 In water and wastewater, phosphate is considered a critical contaminant due to cause algae blooms and eutrophication. To meet the stringent regulation of phosphate in water, a new commercial chelating resin functionalized with polyethylenimine was tested for phosphate removal by loading Cu2+ and Fe2+/Fe3+ to enhance selectivity for phosphate. Batch and column experiments showed that CR20-Cu exhibited high selectivity for phosphate over other strong anions such as sulfate. The average binary phosphate/nitrate and phosphate/sulfate factors for CR20-Cu were calculated to be 7.3 and 4.8, respectively, which were more than 0.97 and 0.22 for a commercial anion exchanger (AMP16). The optimal pH for the phosphate removal efficiency was determined to be 7. According to the fixed-bed column test, the breakthrough sequence for multiple ions was HPO42- > SO42- > NO3- > Cl-. Saturated CR20-Cu can be regenerated using 4% NaCl at pH 7. More than 95% of the phosphate from CR20-Cu was recovered, and the phosphate uptake capacity for CR20-Cu was not reduced after 7 regeneration cycles. (C) 2013 Elsevier Inc. All rights reserved. English ACADEMIC PRESS INC ELSEVIER SCIENCE Enhanced phosphate selectivity from wastewater using copper-loaded chelating resin functionalized with polyethylenimine Article 10.1016/j.jcis.2013.07.038 1 JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.409, pp.129 - 134 JOURNAL OF COLLOID AND INTERFACE SCIENCE 409 129 134 N scie scopus 000324510700018 2-s2.0-84884415086 Chemistry, Physical Chemistry Article POLYMERIC LIGAND EXCHANGER REMOVAL PHOSPHORUS ARSENATE SORPTION Phosphate Ion exchanger Selectivity Regeneration