Study on the adsorption kinetics of orthophosphate anions on layer double hydroxide |
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| Authors: | Shuchuan Peng Lü Lü Jin Wang Lu Han Tianhu Chen Shaotong Jiang |
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| Institution: | School of Resources and Environment, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | 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. |
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| Keywords: | layer double hydroxide orthophosphate anion adsorption |
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