磷吸附剂Mg/Al-LDO的再生方法及机制

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Abstract

In order to improve the reuse of phosphorus adsorbent Mg/Al-LDO, the regeneration effects of roasting one-step regeneration and desorption-roasting two-step regeneration were compared.Based on XRD and FTIR spectrum analysis, the changes of crystal structure and interlayer anionof the adsorbentwere analyzed, and the regeneration mechanism of Mg/Al-LDO and reasons for the declining regenerationratewere then discussed. The results indicated thatdesorption-roasting two-step regeneration was more suitable for the regeneration of Mg/Al-LDO, with the following optimum regeneration condition:desorption solution of NaOH-Na₂CO₃ mixture, roasting temperature of 550℃ and duration of 6h. It was found that the primary regeneration rate reached 95%, but the regeneration rate dropped to 67% after five regenerations. Thus, a problem of decreased regeneration rate existed. Based on the adsorption mechanism of Mg/Al-LDO and the analysis of XRD and FTIR spectrum, the reasons for the declining regeneration rate include two aspects:(1) incomplete desorption of phosphate due to the chemical adsorptionof Mg/Al-LDO led toun-removed residual phosphate in the crystal under high temperature calcination that still occupy the adsorbent adsorption site; (2) the conversion of Mg/Al-LDO into spinel(MgAl₂O₄) after several high-temperature calcinationsled to the loss of adsorption capacity.

Key words： phosphorus adsorbent Mg/Al-LDO roasting one-step regeneration desorption-roasting two-step regeneration regeneration mechanism

Received: 02 November 2016

PACS:

X703.1

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	Articles by authors
	WANG Wei-dong
	HAO Rui-xia
	ZHU Xiao-xia
	WAN Jing-jing
	ZHONG Li-yan

Cite this article:

WANG Wei-dong,HAO Rui-xia,ZHU Xiao-xia等. Regeneration method and mechanism of phosphorus adsorbent Mg/Al-LDO[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(6): 2092-2099.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I6/2092

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