Park, Ki Young Song, Ji Hyun Lee, Sang Hyup Kim, Han S. 2024-01-20T18:33:55Z 2024-01-20T18:33:55Z 2021-09-05 2010-09 1092-8758 https://pubs.kist.re.kr/handle/201004/131131 In this study, a synthetic layered double hydroxide modified with chloride ions (LDH-Cl) was employed for the removal of phosphorus from wastewaters. A series of phosphate adsorption experiments demonstrated that the adsorption capacity of LDH-Cl was described well by the three-parameter isotherm model (Langmuir-Freundlich combination model). LDH-Cl was found to have similar to 50 mg P/g of ion exchange capacity for phosphate, which was sufficient for phosphate recovery from wastewaters. Phosphate adsorption by LDH-Cl also followed pseudo-second-order reaction kinetics. Effective replacement of Cl- with PO43- during sorption was confirmed by X-ray diffraction and Fourier transform infrared analyses. Adsorption capacity varied with pH and reached a maximum value at pH 3. Anions commonly present in most wastewaters, such as nitrate, sulfate, and chloride, had a minimal effect on phosphate adsorption by LDH-Cl. On the contrary, the amount of phosphate ions removed by LDH-Cl decreased with increasing bicarbonate ion concentration. LDH-Cl also exhibited a sufficient chemical stability against adsorption/desorption repetitions and similar to 80% of desorption rate was achieved at 5 M NaCl concentration. LDH-Cl exhibited a high phosphate removal capacity and a low sensitivity to the environmental conditions of wastewaters, supporting use as an effective means for the removal of phosphate. English MARY ANN LIEBERT, INC LAYERED DOUBLE HYDROXIDES ADSORPTIVE REMOVAL PHOSPHATE Utilization of a Selective Adsorbent for Phosphorus Removal from Wastewaters Article 10.1089/ees.2010.0139 1 ENVIRONMENTAL ENGINEERING SCIENCE, v.27, no.9, pp.805 - 810 ENVIRONMENTAL ENGINEERING SCIENCE 27 9 805 810 scie scopus 000281666300011 2-s2.0-77958028409 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article LAYERED DOUBLE HYDROXIDES ADSORPTIVE REMOVAL PHOSPHATE adsorption layered double hydroxide phosphate secondary effluent selectivity