Adsorption of arsenate onto ferrihydrite from aqueous solution: Influence of media (sulfate vs nitrate), added gypsum, and pH alteration

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	Adsorption of arsenate onto ferrihydrite from aqueous solution: Influence of media (sulfate vs nitrate), added gypsum, and pH alteration
	Jia, YF; Demopoulos, GP; Demopoulos, GP, McGill Univ, Dept Min Met & Mat Engn, 3640 Univ St, Montreal, PQ H3A 2B2, Canada
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2005
卷号	39 期号:24 页码:9523-9527
ISSN号	0013-936X
英文摘要	Mineral processing effluents generated in hydrometallurgical industrial operations are sulfate based; hence it is of interest to investigate the effect sulfate matrix solution ("sulfate media") has on arsenate adsorption onto ferrihydrite. In this work, in particular, the influence of media (SO42- vs NO3-), added gypsum, and pH alteration on the adsorption of arsenate onto ferrihydrite has been studied. The ferrihydrite precipitated from sulfate solution incorporated a significant amount of sulfate ions and showed a much higher adsorption capacity for arsenate compared to nitrate-ferrihydrite at pH 3-8 and initial Fe/As molar ratios of 2, 4, and 8. Adsorption of arsenate onto sulfate-ferrihydrite involved ligand exchange with SO42- ions that were found to be more easily exchangeable with increasing pH. Added gypsum to the adsorption system significantly enhanced the uptake of arsenate by ferrihydrite at pH 8. Equilibration treatment at acidic pH and addition of gypsum markedly improved the stability of adsorbed arsenate on ferrihydrite when pH was elevated. Comparison of arsenate adsorption onto ferrihydrite to coprecipitation of arsenate with iron(III) showed the latter process to lead to higher arsenic removal.
学科主题	Engineering, Environmental ; Environmental Sciences
语种	英语
WOS记录号	WOS:000234133300024
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/55027]
专题	沈阳应用生态研究所_沈阳应用生态研究所
通讯作者	Demopoulos, GP, McGill Univ, Dept Min Met & Mat Engn, 3640 Univ St, Montreal, PQ H3A 2B2, Canada
推荐引用方式 GB/T 7714	Jia, YF,Demopoulos, GP,Demopoulos, GP, McGill Univ, Dept Min Met & Mat Engn, 3640 Univ St, Montreal, PQ H3A 2B2, Canada. Adsorption of arsenate onto ferrihydrite from aqueous solution: Influence of media (sulfate vs nitrate), added gypsum, and pH alteration[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2005,39(24):9523-9527.
APA	Jia, YF,Demopoulos, GP,&Demopoulos, GP, McGill Univ, Dept Min Met & Mat Engn, 3640 Univ St, Montreal, PQ H3A 2B2, Canada.(2005).Adsorption of arsenate onto ferrihydrite from aqueous solution: Influence of media (sulfate vs nitrate), added gypsum, and pH alteration.ENVIRONMENTAL SCIENCE & TECHNOLOGY,39(24),9523-9527.
MLA	Jia, YF,et al."Adsorption of arsenate onto ferrihydrite from aqueous solution: Influence of media (sulfate vs nitrate), added gypsum, and pH alteration".ENVIRONMENTAL SCIENCE & TECHNOLOGY 39.24(2005):9523-9527.