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首页> 外文期刊>Environmental Science & Technology >Sorption of Eu(III) on Attapulgite Studied by Batch, XPS, and EXAFS Techniques
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Sorption of Eu(III) on Attapulgite Studied by Batch, XPS, and EXAFS Techniques

机译：用批，XPS和EXAFS技术研究Eu（III）在凹凸棒石上的吸附

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摘要

The effects of pH, ionic strength, and temperature on sorption of Eu(III) on attapulgite were investigated in the presence and absence of fulvic acid (FA) and humic acid (HA). The results indicated that the sorption of Eu(III) on attapulgite was strongly dependent on pH and ionic strength, and independent of temperature. In the presence of FA/HA, Eu(III) sorption was enhanced at pH < 4, decreased at pH range of 4-6, and then increased again at pH > 7. The X-ray photoelectron spectroscopy (XPS) analysis suggested that the sorption of Eu(III) might be expressed as ≡X_3Eu~0, ≡S~WOHEu~(3+), and ≡SOEu-OOC-/HA in the ternary Eu/HA/attapulgite system. The extended X-ray absorption fine structure (EXAFS) analysis of Eu-HA complexes indicated that the distances of d(Eu-O) decreased from 2.415 to 2.360 A with increasing pH from 1.76 to 9.50, whereas the coordination number (N) decreased from ～9.94 to ～8.56. Different complexation species were also found for the different addition sequences of HA and Eu(III) to attapulgite suspension. The results are important to understand the influence of humic substances on Eu(III) behavior in the natural environment.
机译：在存在和不存在富里酸（FA）和腐殖酸（HA）的条件下，研究了pH，离子强度和温度对凹凸棒石上Eu（III）吸附的影响。结果表明，凹凸棒石上Eu（III）的吸附强烈依赖于pH值和离子强度，并且与温度无关。在FA / HA存在下，在pH <4时，Eu（III）的吸附增强，在pH 4-6时降低，然后在pH> 7时再次增加。X射线光电子能谱（XPS）分析表明：在三元Eu / HA /凹凸棒石体系中，Eu（III）的吸附可以表示为≡X_3Eu〜0，≡S〜WOHEu〜（3+）和≡SOEu-OOC-/ HA。 Eu-HA配合物的扩展X射线吸收精细结构（EXAFS）分析表明，随着pH从1.76增加到9.50，d（Eu-O）的距离从2.415减小到2.360 A，而配位数（N）减小从〜9.94到〜8.56。还发现HA和Eu（III）向绿坡缕石悬浮液的不同添加顺序的不同络合物种。结果对于了解腐殖质对自然环境中Eu（III）行为的影响非常重要。

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  • 来源
    《Environmental Science & Technology》 |2009年第15期|5776-5782|共7页
  • 作者

    Q. H. FAN; X. L. TAN; J. X. LI; X. K. WANG; W. S. WU; G. MONTAVON;

  • 作者单位

    Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, P.R. China Radiochemistry Laboratory, Lanzhou University, Lanzhou, 730000, P.R. China;

    Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, P.R. China;

    Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, P.R. China;

    Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, P.R. China;

    Radiochemistry Laboratory, Lanzhou University, Lanzhou, 730000, P.R. China;

    Laboratory SUBATECH, UMR 6457 Ecole des Mines de Nantes/IN2P3-CNRS/Universite de Nantes, 4 rue A. Kastler, BP 20722, 44307 Nantes cedex 03, France;

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