Study on Fe(Ⅲ) doped Mg/Al-LDO as nitrogen and phosphorus adsorbent
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
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.
万京京, 郝瑞霞, 马静雨, 王丽沙, 刘思远. Fe(Ⅲ)掺杂Mg/Al-LDO作为氮磷吸附剂的研究[J]. 中国环境科学, 2018, 38(4): 1295-1303.
WAN Jing-jing, HAO Rui-xia, MA Jing-yu, WANG Li-sha, LIU Si-yuan. Study on Fe(Ⅲ) doped Mg/Al-LDO as nitrogen and phosphorus adsorbent. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(4): 1295-1303.
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