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    FeS胶体对三价铁吸附态As(Ⅴ)的解吸作用

    成东 廖鹏 袁松虎

    成东, 廖鹏, 袁松虎, 2016. FeS胶体对三价铁吸附态As(Ⅴ)的解吸作用. 地球科学, 41(2): 325-330. doi: 10.3799/dqkx.2016.024
    引用本文: 成东, 廖鹏, 袁松虎, 2016. FeS胶体对三价铁吸附态As(Ⅴ)的解吸作用. 地球科学, 41(2): 325-330. doi: 10.3799/dqkx.2016.024
    Cheng Dong, Liao Peng, Yuan Songhu, 2016. Effect of FeS Colloids on Desorption of As(Ⅴ) Adsorbed on Ferric Iron. Earth Science, 41(2): 325-330. doi: 10.3799/dqkx.2016.024
    Citation: Cheng Dong, Liao Peng, Yuan Songhu, 2016. Effect of FeS Colloids on Desorption of As(Ⅴ) Adsorbed on Ferric Iron. Earth Science, 41(2): 325-330. doi: 10.3799/dqkx.2016.024

    FeS胶体对三价铁吸附态As(Ⅴ)的解吸作用

    doi: 10.3799/dqkx.2016.024
    基金项目: 

    教育部新世纪优秀人才支持计划 NCET-13-1014

    详细信息
      作者简介:

      成东(1990-),男,在读硕士,主要从事沉积物中胶体与污染物相互作用研究.E-mail: justin_chengcug@163.com

      通讯作者:

      袁松虎,E-mail:yuansonghu622@cug.edu.cn

    • 中图分类号: X523

    Effect of FeS Colloids on Desorption of As(Ⅴ) Adsorbed on Ferric Iron

    • 摘要: 地下水中的含铁胶体颗粒会携带污染物如砷等运移,但人们对该过程中的机理缺乏认识.通过群组静态吸附解吸模拟实验, 探究FeS胶体对吸附在覆Fe2O3石英砂上As(Ⅴ)的解吸作用, 以及腐殖酸(HA)、H2PO4-和HCO3-对解吸的影响.实验结果表明,室内合成的FeS胶体具有纳米级粒径和较大的比表面积,且能均匀稳定存在于水溶液中.低浓度的FeS胶体主要通过竞争覆Fe2O3石英砂表面的吸附点位将As(Ⅴ)解吸,而高浓度的FeS胶体主要通过与覆Fe2O3石英砂竞争对As(Ⅴ)的吸附而导致解吸.HA、H2PO4-和HCO3-对As(Ⅴ)的竞争解吸作用降低了FeS胶体导致的解吸效率.

       

    • 图  1  FeS胶体对水溶液中As(Ⅴ)的吸附时间曲线

      Fig.  1.  Time profiles of As (V) adsorption by FeS colloids in aqueous solution

      图  2  FeS胶体对As(Ⅴ)的解吸时间曲线(a),以及溶液中FeS浓度随时间的变化(b)

      Fig.  2.  Time profiles of As(Ⅴ) desorption by FeS colloids (a), the change of FeS concentration by time in the solution (b)

      图  3  不同浓度HA对FeS胶体解吸As(Ⅴ)的影响

      Fig.  3.  Effects of HA on As (V) desorption by FeS colloids

      图  4  不同浓度H2PO4-对FeS胶体解吸As(Ⅴ)的影响(a),以及对溶液中H2PO4-浓度的变化(b)

      Fig.  4.  Effects of H2PO4- on As (V) desorption by FeS colloids (a), and the change of H2PO4- concentration in the solution (b)

      图  5  HCO3-对FeS胶体解吸As(Ⅴ)的影响

      Fig.  5.  Effects of HCO3- on As (V) desorption by FeS colloids

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    • 收稿日期:  2015-08-30
    • 刊出日期:  2016-02-15

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