新型水泥基材料富镁C<sub>3</sub>A对氮磷的共去除

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Abstract Magnesium-rich C₃A (Mg@C₃A) was successfully prepared via doping magnesium into cement-based material tricalcium aluminate (C₃A) for the co-removal of ammonium (NH₄⁺-N) and phosphorus (PO₄^3-). The effects of Mg@C₃A dosage, contaminants concentration, solution pH value, and temperature as well as the mechanism were investigated. Mg@C₃A was composed of the C₃A isomorphism formed by the replacement of Ca with Mg and the surface MgO, in which the Mg doping does not affect the cubic symmetric structure and morphology of C₃A. The maximum removal capacity of NH₄⁺ and PO₄^3- were 38.4, 78.9mg/g at the Mg@C₃A dosage of 3g/L, respectively. The increase of temperature was conducive to the co-removal of NH₄⁺ and PO₄^3-by Mg@C₃A. High pH value enhanced the NH₄⁺ removal. The removal mechanism of NH₄⁺ was mainly neutralization and the precipitation; PO₄^3- was removed via the precipitation combining with Mg²⁺ or Al³⁺ to form struvite or aluminum phosphate.

Key words： magnesium-rich tricalcium aluminate (Mg@C₃A) ammonium (NH₄⁺) phosphate (PO₄^3-) co-removal

Received: 02 November 2020

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X703.1

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	Articles by authors
	ZOU You-qin
	LI Yong-li
	HAO Peng-fei
	OUYANG Si-da
	ZHU Zhong-bang
	ZHANG Ping

Cite this article:

ZOU You-qin,LI Yong-li,HAO Peng-fei等. The co-removal of ammonium and phosphate by novel cement-based material magnesium-rich tricalcium aluminate and its mechanism investigation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2639-2645.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2639

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