Removal behavior research of orthophosphate by CaFe-layered double hydroxides

Yunfeng XuSchool of Environmental and Chemical Engineering, Shanghai University, Shanghai200444, China, Tel./Fax: +86 21 66137758Correspondence[email protected]

Hetian HouSchool of Environmental and Chemical Engineering, Shanghai University, Shanghai200444, China, Tel./Fax: +86 21 66137758Correspondence[email protected]

Qiang LiuSchool of Environmental and Chemical Engineering, Shanghai University, Shanghai200444, China, Tel./Fax: +86 21 66137758Correspondence[email protected]

Jianyong LiuSchool of Environmental and Chemical Engineering, Shanghai University, Shanghai200444, China, Tel./Fax: +86 21 66137758Correspondence[email protected]

Li DouSchool of Environmental and Chemical Engineering, Shanghai University, Shanghai200444, China, Tel./Fax: +86 21 66137758Correspondence[email protected]

Guangren QianSchool of Environmental and Chemical Engineering, Shanghai University, Shanghai200444, China, Tel./Fax: +86 21 66137758Correspondence[email protected]

Abstract

The different removal behavior of orthophosphate (OP) over the CaFe-layered double hydroxides (CaFe-LDH) was investigated. The results displayed that the existence of Ca²⁺ in the solution could promote the phosphorus removal, the removal efficiency could reach 100% with 1.473 mmol P/g LDH. The kinetics fitting parameters showed that the removal process of OP was in accordance with the secondary dynamic equation, and it changed from the homogeneous reaction to heterogeneous reaction according to Elovich equation. Moreover, Freundlich isothermal adsorption equation preferably described the removal process of OP, indicated that it was a complicated process including physical and chemical adsorption. The main removal mechanism was the formation of hydroxyapatite by and Ca²⁺ dissolved from LDHs, and ferrihydrite could also strengthen the OP removal effect via the formation of surface complexes.

Keywords:

Acknowledgments

This project is financially supported by the National Nature Science Foundation of China (No. 21107067/B070303, No. 41472312/D0218) and Innovative Research Team in University (No. IRT13078).

Notes

Presented at the 7th International Conference on Challenges in Environmental Science and Engineering (CESE 2014) 12–16 October 2014, Johor Bahru, Malaysia

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Removal behavior research of orthophosphate by CaFe-layered double hydroxides

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