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首页> 外文期刊>Environmental Science & Technology >Heavy Metal Sorption at the Muscovite (OOI)-Fulvic Acid Interface
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Heavy Metal Sorption at the Muscovite (OOI)-Fulvic Acid Interface

机译：在白云母（OOI）-富勒酸界面上的重金属吸附

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摘要

The role of fulvic acid (FA) in modifying the adsorption mode and sorption capacity of divalent metal cations on the muscovite (001) surface was evaluated by measuring the uptake of Cu~2+, Zn~2+, and Pb~2+ from 0.01 m solutions at pH 3.7 with FA using in situ resonant anomalous X-ray reflectivity. The molecular-scale distributions of these cations combined with those previously observed for Hg~2+, Sr~2+, and Ba~2+ indicate metal uptake patterns controlled by cation—FA binding strength and cation hydration enthalpy. For weakly hydrated cations the presence of FA increased metal uptake by approximately 60—140%. Greater uptake corresponded with increasing cation-FA affinity (Ba~2+ = Sr~2+ < Pb~2+ < Hg~2+). This trend is associated with differences in the sorption mechanism: Ba and Sr sorbed in the outer portion of the FA film whereas Pb and Hg~2+ complexed with FA effectively throughout the film. The more strongly hydrated Cu~2+ and Zn~2+ adsorbed as two distinct outer-sphere complexes on the muscovite surface, with minimal change from their distribution without FA, indicating that their strong hydration impedes additional binding to the FA film despite their relatively strong affinity for FA.
机译：通过测量从中吸收的Cu〜2 +，Zn〜2 +和Pb〜2 +的吸收率，评估了富里酸（FA）在改变白云母（001）表面上二价金属阳离子的吸附方式和吸附能力方面的作用。使用原位共振反常X射线反射率，在FA值为pH 3.7的0.01 m溶液中。这些阳离子的分子尺度分布与先前观察到的Hg〜2 +，Sr〜2 +和Ba〜2 +的分子尺度分布相结合，表明金属吸收模式受阳离子-FA结合强度和阳离子水合焓控制。对于弱水合阳离子，FA的存在使金属吸收增加了约60-140％。较大的吸收与增加的阳离子-FA亲和力相对应（Ba〜2 + = Sr〜2 +

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  • 来源
    《Environmental Science & Technology》 |2011年第22期|p.9574-9581|共8页
  • 作者

    Sang Soo Lee; Kathryn L. Nagy; Changyong Park; Paul Fenter;

  • 作者单位

    Department of Earth and Environmental Sciences, 845 West Taylor Street MC-186, University of Illinois at Chicago, Chicago, Illinois 60607, United States;

    Department of Earth and Environmental Sciences, 845 West Taylor Street MC-186, University of Illinois at Chicago, Chicago, Illinois 60607, United States;

    Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439,United States;

    Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439,United States;

  • 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);
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