Fe(Ⅲ)掺杂Mg/Al-LDO作为氮磷吸附剂的研究

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Abstract

Aiming at the problem of nitrogen and phosphorus removal from sewage plant effluent, Mg/Al/Fe-layered double hydroxides (Mg/Al/Fe-LDHs) were synthesized via co-precipitation method, and they were then calcined for 3h under a calcination temperature of 450℃ to obtain layered double oxide (Mg/Al/Fe-LDO). The effects of Fe (Ⅲ) doping ratio on the adsorption of nitrogen and phosphorus by Mg/Al-LDO and its adsorption characteristics were investigated. The results indicated that when the Mg/Al/Fe molar ratio to 3:0.6:0.4, Mg/Al/Fe-LDO had better adsorption with the maximum adsorption capacity of nitrogen and phosphorus being 28.57 and 231.46mg/g. Respectively, the adsorption process could be described by Langmuir adsorption isotherm model, the fitting correlation coefficient (R²) were both above 0.99. Based on the results of XRD and FTIR, it was concluded that nitrogen and phosphorus removal were mainly accomplished by "memory effect" and electrostatic attraction, while phosphorus removal was also accomplished by ion exchange.

Key words： adsorption Mg/Al/Fe-LDO the Fe (Ⅲ) doping adsorption characteristics adsorption mechanism

Received: 10 September 2017

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	Articles by authors
	WAN Jing-jing
	HAO Rui-xia
	MA Jing-yu
	WANG Li-sha
	LIU Si-yuan

Cite this article:

WAN Jing-jing,HAO Rui-xia,MA Jing-yu等. Study on Fe(Ⅲ) doped Mg/Al-LDO as nitrogen and phosphorus adsorbent[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(4): 1295-1303.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I4/1295

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