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Study on the adsorption kinetics of

时间:2021-12-11 11:08:53 天文地理论文 我要投稿

Study on the adsorption kinetics of orthophosphate anions on layer double hydroxide

A kinetic study was conducted on the adsorption of orthophosphate anions on layer double hydroxide (LDH). The adsorption has proved itself to be a spontaneous endothermic process and is large in capacity and rate. The adsorption isotherm correlates well with the Freundlich model, and a rise in temperature will lead to an increase in adsorption efficiency. Additionally, the results suggested that the adsorption is an entropy-increasing process and is in good agreement with the pseudo-second order kinetics. The free energy (ΔG) of adsorption of orthophosphate onto LDH varies within the range of -1.75- -3.34 kJ/mol, the enthalpy (ΔH) varies by 7.96 kJ/mol and the entropy (ΔS) by 33.59 kJ/mol. The adsorption activation energy is 8.3 kJ/mol, showing that the adsorption of orthophosphate onto LDH is determined to be a physical adsorption.

作 者: PENG Shuchuan L(U) Lü WANG Jin HAN Lu CHEN Tianhu JIANG Shaotong   作者单位: School of Resources and Environment, Hefei University of Technology, Hefei 230009, China  刊 名: 中国地球化学学报(英文版)  英文刊名: CHINESE JOURNAL OF GEOCHEMISTRY  年,卷(期): 2009 28(2)  分类号: P59  关键词: layer double hydroxide   orthophosphate anion   adsorption