Sorption mechanisms of diphenylarsinic acid on ferrihydrite, goethite and hematite using sequential extraction, FTIR measurement and XAFS spectroscopy

doi:10.1016/j.scitotenv.2019.03.166

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	Sorption mechanisms of diphenylarsinic acid on ferrihydrite, goethite and hematite using sequential extraction, FTIR measurement and XAFS spectroscopy
	Zhu M; Hu XF; Tu C; Zhang HB; Song F; Luo YM; Luo YM
发表期刊	Science of the Total Environment
ISSN	0048-9697
	2019
卷号	669 页码:991-1000
关键词	Diphenylarsinic acid (DPAA) Sorption mechanism Iron (hydr)oxides Sequential extraction FTIR EXAFS
研究领域	Environmental Sciences
DOI	10.1016/j.scitotenv.2019.03.166
产权排序	1
通讯作者	Luo, Yongming(ymluo@yic.ac.cn)
作者部门	海岸带环境过程实验室
英文摘要	Diphenylarsinic acid (DPAA) is an organoarsenic compound derived from abandoned chemical weapons. DPAA sorption by iron (hydr)oxides is of considerable importance but remains largely unexplored. The current study aimed at investigating the sorption mechanisms of DPAA on ferrihydrite, goethite and hematite using both macroscopic sorption kinetics and sequential extraction procedure (SEP) as well as microscopic Fourier transformed infrared (FTIR) and extended X-ray absorption fine structure (EXAFS) spectroscopic techniques. Sorption kinetics studies show that >93% of added DPAA (4-100 mg L-1) was sorbed on ferrihydrite and hematite within 5 min, while only 84% of added DPAA (100 mg L-1) was sorbed on goethite after 24 h. The sequential extraction results and FTIR measurements reveal that DPAA formed simultaneously inner- and outer-sphere complexes on goethite and hematite, but predominantly inner-sphere complexes on ferrihydrite with limited formation of outer-sphere complexes (<15%). A combination of SEP, FTIR and EXAFS techniques further enables identification of the interfacial reactions between DPAA and solid surfaces of iron (hydr)oxides and the mechanisms involved. Results indicate that DPAA interacted with these iron (hydr) oxides via (1) electrostatic attraction or hydrogen bonding, (2) surface complexation and (3) complexation embedded inside the mineral particles. EXAFS studies further demonstrate that DPAA formed mainly bidentate binuclear corner-sharing (C-2) complexes regardless of the iron substrate, with As-Fe distances at 3.19-3.32 angstrom. Comparison of these results with available data in the literature on inorganic, methyl and phenyl arsenics (As) suggests that it is the phenyl group substitution that finally determines the predominance of C-2 complexes. Results from the present study will improve our knowledge of DPAA interaction with solid surfaces and may help in the prediction of the environmental fate and environmental risk management of DPAA in the soil-water system. (C) 2019 Elsevier B.V. All rights reserved.
文章类型	Article
资助机构	National Natural Science Foundation of China ; Anhui Provincial Universities Natural Science Research Project ; Doctoral Research Start-up Funds Project of Anhui Normal University ; Talent Cultivation Project of Anhui Normal University
收录类别	SCI
语种	英语
关键词[WOS]	CHEMICAL WARFARE AGENTS ; P-ARSANILIC ACID ; ATR-FTIR ; SURFACE COMPLEXATION ; IRON (OXYHYDR)OXIDES ; DIMETHYLARSINIC ACID ; ARSENIC ADSORPTION ; EXAFS ; DESORPTION ; SPECIATION
研究领域[WOS]	Environmental Sciences
WOS记录号	WOS:000463663500096
引用统计	被引频次：36[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/24147
专题	中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室中国科学院海岸带环境过程与生态修复重点实验室
通讯作者	Luo YM
推荐引用方式 GB/T 7714	Zhu M,Hu XF,Tu C,et al. Sorption mechanisms of diphenylarsinic acid on ferrihydrite, goethite and hematite using sequential extraction, FTIR measurement and XAFS spectroscopy[J]. Science of the Total Environment,2019,669:991-1000.
APA	Zhu M.,Hu XF.,Tu C.,Zhang HB.,Song F.,...&Luo YM.(2019).Sorption mechanisms of diphenylarsinic acid on ferrihydrite, goethite and hematite using sequential extraction, FTIR measurement and XAFS spectroscopy.Science of the Total Environment,669,991-1000.
MLA	Zhu M,et al."Sorption mechanisms of diphenylarsinic acid on ferrihydrite, goethite and hematite using sequential extraction, FTIR measurement and XAFS spectroscopy".Science of the Total Environment 669(2019):991-1000.