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首页> 外文期刊>Environmental Science & Technology >Enhanced Uranium Sorption on Aluminum Oxide Pretreated with Arsenate. Part Ⅰ: Batch Uptake Behavior
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Enhanced Uranium Sorption on Aluminum Oxide Pretreated with Arsenate. Part Ⅰ: Batch Uptake Behavior

机译：用砷酸盐预处理的氧化铝对铀的吸附增强。第一部分：批量摄取行为

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摘要

We explored mechanisms for increasing U(VI) sorption by pretreating alumina surfaces with arsenate, which has a high affinity for binding with uranyl and is an analog for phosphate. Batch experiments were conducted at pH ～4 by pretreating a γ-alumina surface with arsenate, followed by the addition of uranyl. Parallel experiments were conducted with different alumina loadings as well as As and U concentrations. Results show positive correlations between U(VI) uptake and [As]_(ini)/[U]_(ini) (ratio between the initial As solution concentration for pretreatment and the initial U solution concentration), suggesting the formation of ternary surface complexes and/or precipitates. Desorption experiments show partial irreversibilhy of the adsorbed U, suggesting less likelihood of remobilization. The pretreatment process results in enhanced U uptake and enhanced stability of the sorbed U, and provides a basis for designing othertreatment processes for selective remediation applications.
机译：我们探索了通过用砷酸盐预处理氧化铝表面来增加U（VI）吸附的机制，该砷酸盐具有与铀酰结合的高亲和力，并且是磷酸盐的类似物。在pH〜4的条件下进行分批实验，用砷酸盐预处理γ-氧化铝表面，然后加入铀酰。在不同的氧化铝负载量以及As和U浓度下进行了平行实验。结果表明，U（VI）的吸收与[As] _（ini）/ [U] _（ini）的吸收之间呈正相关（用于预处理的初始As溶液浓度与初始U溶液浓度之间的比率），表明三元表面的形成络合物和/或沉淀物。解吸实验表明被吸附的U的部分不可逆性，表明重新固定的可能性较小。预处理过程可提高U吸收率并提高吸附的U的稳定性，并为设计用于选择性修复应用的其他处理过程提供了基础。

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  • 来源
    《Environmental Science & Technology》 |2009年第12期|4446-4451|共6页
  • 作者

    YUANZHI TANG; RICHARD J. REEDER;

  • 作者单位

    Department of Geosciences and Center for Environmental Molecular Science, State University of New York, Stony Brook, New York 11794-2100 School of Engineering and Applied Science, Harvard University, 40 Oxford St., Cambridge, Massachusetts 02138;

    Department of Geosciences and Center for Environmental Molecular Science, State University of New York, Stony Brook, New York 11794-2100;

  • 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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