Infrared spectroscopic and X-ray diffraction characterization of the nature of adsorbed arsenate on ferrihydrite

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	Infrared spectroscopic and X-ray diffraction characterization of the nature of adsorbed arsenate on ferrihydrite
	Jia, YF; Xu, LY; Wang, X; Demopoulos, GP; Jia, YF, Chinese Acad Sci, Key Lab Terrestrial Proc, Inst Appl Ecol, Shenyang 110016, Peoples R China
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2007
卷号	71 期号:7 页码:1643-1654
ISSN号	0016-7037
英文摘要	Fourier transformed infrared (FTIR) spectroscopy was used to characterize arsenate-ferrihydrite sorption solids synthesized at pH 3-8. The speciation of sorbed arsenate was determined based on the As-O stretching vibration bands located at 650-950 cm(-1) and O-H stretching vibration bands at 3000-3500 cm(-1). The positions of the As-O and O-H stretching vibration bands changed with pH indicating that the nature of surface arsenate species on ferrihydrite was strongly pH dependent. Sorption density and synthesis media (sulfate vs. nitrate) had no appreciable effect. At acidic pH (3, 4), ferric arsenate surface precipitate formed on ferrihydrite and constituted the predominant surface arsenate species. X-ray diffraction (XRD) analyses of he sorption solids synthesized at elevated temperature (75 degrees C), pH 3 clearly showed the development of crystalline ferric arsenate (i.e. scorodite). In neutral and alkaline media (pH 7, 8), arsenate sorbed as a bidentate surface complex (in both protonated FeO2As(O)(OH)(-) and unprotonated FeO2As(O)(2)(2-) forms). For the sorption systems in slightly acidic media (pH 5, 6), both ferric arsenate and surface complex were probably present on ferrihydrite. It was further determined that the incorporated sulfate in ferrihydrite during synthesis was substituted by arsenate and was more easily exchangeable with increasing pH. (c) 2007 Elsevier Ltd. All rights reserved.
学科主题	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000245445700001
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/54731]
专题	沈阳应用生态研究所_沈阳应用生态研究所
通讯作者	Jia, YF, Chinese Acad Sci, Key Lab Terrestrial Proc, Inst Appl Ecol, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Jia, YF,Xu, LY,Wang, X,et al. Infrared spectroscopic and X-ray diffraction characterization of the nature of adsorbed arsenate on ferrihydrite[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2007,71(7):1643-1654.
APA	Jia, YF,Xu, LY,Wang, X,Demopoulos, GP,&Jia, YF, Chinese Acad Sci, Key Lab Terrestrial Proc, Inst Appl Ecol, Shenyang 110016, Peoples R China.(2007).Infrared spectroscopic and X-ray diffraction characterization of the nature of adsorbed arsenate on ferrihydrite.GEOCHIMICA ET COSMOCHIMICA ACTA,71(7),1643-1654.
MLA	Jia, YF,et al."Infrared spectroscopic and X-ray diffraction characterization of the nature of adsorbed arsenate on ferrihydrite".GEOCHIMICA ET COSMOCHIMICA ACTA 71.7(2007):1643-1654.