Removal competition mechanism of orthophosphate and pyrophosphate by CaFe-Cl-LDHs

Yunfeng XuSchool of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai200444, P. R. China, Tel. +86 21 66137745; Fax: +86 21 66137761, Tel./Fax: +86 21 66137746, Tel. +86 21 66137769; Fax: +86 21 66137761, Tel./Fax: +86 21 66137758Correspondence[email protected]

Siqi GuoSchool of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai200444, P. R. China, Tel. +86 21 66137745; Fax: +86 21 66137761, Tel./Fax: +86 21 66137746, Tel. +86 21 66137769; Fax: +86 21 66137761, Tel./Fax: +86 21 66137758Correspondence[email protected]

Wei XiaSchool of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai200444, P. R. China, Tel. +86 21 66137745; Fax: +86 21 66137761, Tel./Fax: +86 21 66137746, Tel. +86 21 66137769; Fax: +86 21 66137761, Tel./Fax: +86 21 66137758Correspondence[email protected]

Li DouSchool of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai200444, P. R. China, Tel. +86 21 66137745; Fax: +86 21 66137761, Tel./Fax: +86 21 66137746, Tel. +86 21 66137769; Fax: +86 21 66137761, Tel./Fax: +86 21 66137758Correspondence[email protected]

Jizhi ZhouSchool of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai200444, P. R. China, Tel. +86 21 66137745; Fax: +86 21 66137761, Tel./Fax: +86 21 66137746, Tel. +86 21 66137769; Fax: +86 21 66137761, Tel./Fax: +86 21 66137758Correspondence[email protected]

Jia ZhangSchool of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai200444, P. R. China, Tel. +86 21 66137745; Fax: +86 21 66137761, Tel./Fax: +86 21 66137746, Tel. +86 21 66137769; Fax: +86 21 66137761, Tel./Fax: +86 21 66137758Correspondence[email protected]

Jianyong LiuSchool of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai200444, P. R. China, Tel. +86 21 66137745; Fax: +86 21 66137761, Tel./Fax: +86 21 66137746, Tel. +86 21 66137769; Fax: +86 21 66137761, Tel./Fax: +86 21 66137758Correspondence[email protected]

Guangren QianSchool of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai200444, P. R. China, Tel. +86 21 66137745; Fax: +86 21 66137761, Tel./Fax: +86 21 66137746, Tel. +86 21 66137769; Fax: +86 21 66137761, Tel./Fax: +86 21 66137758Correspondence[email protected]

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Abstract

Large amount of phosphorous is the main factor for eutrophication. Removal of orthophosphate and pyrophosphate with CaFe-Cl-LDHs was explored in the paper. And the aim of this paper was to investigate the different mechanisms of orthophosphate and pyrophosphate removal by CaFe-Cl-LDHs. The results displayed that the removal process was precipitation-dissolution between Ca²⁺ and orthophosphate or pyrophosphate, which was fitted with the pseudo-second-order equation well; when Ca²⁺ was not enough, pyrophosphate had a competitive advantage over orthophosphate; as the concentration of pyrophosphate increased, precipitate was formed by Ca²⁺ and . The simultaneous removal of orthophosphate and pyrophosphate on CaFe-Cl-LDHs was also evaluated to provide information for the treatment of domestic and industrial wastewaters.

Keywords:

Acknowledgments

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

Notes

Presented at the 8th International Conference on Challenges in Environmental Science & Engineering (CESE-2015) 28 September–2 October 2015, Sydney, Australia

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Removal competition mechanism of orthophosphate and pyrophosphate by CaFe-Cl-LDHs

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Removal competition mechanism of orthophosphate and pyrophosphate by CaFe-Cl-LDHs

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