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首页> 外文期刊>Journal of Hazardous Materials >Adsorption of antimony onto iron oxyhydroxides: Adsorption behavior and surface structure
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Adsorption of antimony onto iron oxyhydroxides: Adsorption behavior and surface structure

机译：锑在羟基氧化铁上的吸附行为：吸附行为和表面结构

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摘要

Antimony is detected in soil and water with elevated concentration due to a variety of industrial applications and mining activities. Though antimony is classified as a pollutant of priority interest by the United States Environmental Protection Agency (USEPA) and Europe Union (EU), very little is known about its environmental behavior and adsorption mechanism. In this study, the adsorption behaviors and surface structure of antimony (III/V) on iron oxides were investigated using batch adsorption techniques, surface complexation modeling (SCM), X-ray photon spectroscopy (XPS) and extended X-ray absorption fine structure spectroscopy (EXAFS). The adsorption isotherms and edges indicated that the affinity of Sb(V) and Sb(III) toward the iron oxides depended on the Sb species, solution pH, and the characteristics of iron oxides. Sb(V) adsorption was favored at acidic pH and decreased dramatically with increasing pH, while Sb(III) adsorption was constant over a broad pH range. When pH is higher than 7, Sb(III) adsorption by goethite and hydrous ferric oxide (HFO) was greater than Sb(V). EXAFS analysis indicated that the majority of Sb(III), either adsorbed onto HFO or co-precipitated by FeCl3, was oxidized into Sb(V) probably due to the involvement of O-2 in the long duration of sample preservation. Only one Sb-Fe subshell was filtered in the EXAFS spectra of antimony adsorption onto HFO, with the coordination number of 1.0-1.9 attributed to bidentate mononuclear edge-sharing (E-2) between Sb and HFO. (C) 2014 Elsevier B.V. All rights reserved.
机译：由于各种工业应用和采矿活动，土壤和水中的锑含量升高。尽管锑被美国环境保护署（USEPA）和欧洲联盟（EU）列为优先关注的污染物，但对其环境行为和吸附机理知之甚少。在这项研究中，使用批吸附技术，表面络合模型（SCM），X射线光子能谱（XPS）和扩展的X射线吸收精细结构研究了锑（III / V）在氧化铁上的吸附行为和表面结构。光谱学（EXAFS）。吸附等温线和边缘表明Sb（V）和Sb（III）对氧化铁的亲和力取决于Sb的种类，溶液的pH值和氧化铁的特性。 Sb（V）的吸附在酸性pH值时是有利的，并且随着pH的增加而急剧下降，而Sb（III）的吸附在宽pH范围内保持恒定。当pH值高于7时，针铁矿和含水三氧化二铁（HFO）对Sb（III）的吸附大于Sb（V）。 EXAFS分析表明，大部分Sb（III）要么吸附在HFO上，要么被FeCl3共沉淀，可能被氧化为Sb（V），这可能是由于O-2参与了长时间的样品保存。在锑吸附到HFO的EXAFS光谱中仅过滤了一个Sb-Fe子壳，其配位数1.0-1.9归因于Sb和HFO之间的双齿单核边缘共享（E-2）。 （C）2014 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2014年第15期|339-345|共7页
  • 作者

    Guo Xuejun; Wu Zhijun; He Mengchang; Meng Xiaoguang; Jin Xin; Qiu Nan; Zhang Jing;

  • 作者单位

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Stevens Inst Technol, Ctr Environm Syst, Hoboken, NJ 07030 USA;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    EXAFS; Antimony; Iron oxyhydroxides; Adsorption;

    机译：EXAFS;锑;羟基氧化铁;吸附;

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