Removal of phosphate from water by a Fe-Mn binary oxide adsorbent

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Removal of phosphate from water by a Fe-Mn binary oxide adsorbent
	Zhang, Gaosheng; Liu, Huijuan; Liu, Ruiping; Qu, Jiuhui
刊名	JOURNAL OF COLLOID AND INTERFACE SCIENCE
	2009-07-15
卷号	335 期号:2 页码:168-174
关键词	Fe-Mn binary oxide Phosphate removal Mechanism Specific adsorption
中文摘要	Phosphate removal is important in the control of eutrophication of water bodies and adsorption is one of the promising approaches for this purpose. A Fe-Mn binary oxide adsorbent with a Fe/Mn molar ratio of 6:1 for phosphate removal was synthesized by a simultaneous oxidation and coprecipitation process. Laboratory experiments were carried out to investigate adsorption kinetics and equilibrium, in batch mode. The effects of different experimental parameters, namely contact time, initial phosphate concentration, solution pH, and ionic strength on the phosphate adsorption were investigated. The adsorption data were analyzed by both Freundlich and Langmuir isotherm models and the data were well fit by the Freundlich isotherm model. Kinetic data correlated well with the pseudo-second-order kinetic model, suggesting that the adsorption process might be chemical sorption. The maximal adsorption capacity was 36 mg/g at pH 5.6. The phosphate adsorption was highly pH dependent. The effects of anions such as Cl(-), SO(4)(2-), and CO(3)(2-) on phosphate removal were also investigated. The results suggest that the presence of these ions had no significant effect on phosphate removal. The phosphate removal was mainly achieved by the replacement of surface hydroxyl groups by the phosphate species and formation of inner-sphere surface complexes at the water/oxide interface. In addition, the adsorbed phosphate ions can be effectively desorbed by dilute NaOH solutions. This adsorbent, with large adsorption capacity and high selectivity, is therefore a very promising adsorbent for the removal of phosphate ions from aqueous solutions. (C) 2009 Elsevier Inc. All rights reserved.
WOS记录号	WOS:000266644000002
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/21733]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Zhang, Gaosheng,Liu, Huijuan,Liu, Ruiping,et al. Removal of phosphate from water by a Fe-Mn binary oxide adsorbent[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2009,335(2):168-174.
APA	Zhang, Gaosheng,Liu, Huijuan,Liu, Ruiping,&Qu, Jiuhui.(2009).Removal of phosphate from water by a Fe-Mn binary oxide adsorbent.JOURNAL OF COLLOID AND INTERFACE SCIENCE,335(2),168-174.
MLA	Zhang, Gaosheng,et al."Removal of phosphate from water by a Fe-Mn binary oxide adsorbent".JOURNAL OF COLLOID AND INTERFACE SCIENCE 335.2(2009):168-174.