摘要
针对污水厂尾水脱氮除磷问题,采用共沉淀法制备了镁铝铁类水滑石(Mg/Al/Fe–LDHs),在450℃下焙烧3h得到焙烧态类水滑石(Mg/Al/Fe–LDO).研究了Fe(Ⅲ)掺杂对Mg/Al-LDO吸附氮磷的影响及吸附特性.结果表明,当Mg/Al/Fe物质的量比为3:0.6:0.4时,Mg/Al/Fe-LDO对氮磷吸附性能较好,最大吸附容量分别为28.57mg/g和231.46mg/g.吸附过程均符合Langmuir吸附等温模型,拟合相关系数(R^2)达到0.99以上.根据XRD、FTIR的表征结果可以推断,Mg/Al/Fe–LDO是通过"记忆效应"、静电引力作用完成对氮磷的吸附,对磷的吸附还包括离子交换作用.
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.
作者
万京京
郝瑞霞
马静雨
王丽沙
刘思远
WAN Jing-jing;HAO Rui-xia;MA Jing-yu;WANG Li-sha;LIU Si-yuan(Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,College of Architectural Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第4期1295-1303,共9页
China Environmental Science
基金
国家自然科学基金项目(51778011)
