Zhu M; Hu XF
; Tu C; Zhang HB; Song F; Luo YM; Luo YM发表期刊Science of the Total Environment
ISSN0048-9697
2019
卷号669页码:991-1000
关键词Diphenylarsinic acid (DPAA)Sorption mechanismIron (hydr)oxidesSequential extractionFTIREXAFS
研究领域Environmental Sciences
DOI10.1016/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：16[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.cnhttp://ir.yic.ac.cn/handle/133337/24147
专题中科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
中科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 7714Zhu 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.
APAZhu 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.
MLAZhu 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.
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