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首页> 外文期刊>Environmental Science & Technology >Adsorption of Uranyl on Gibbsite:A Time-Resolved Laser-Induced Fluorescence Spectroscopy Study
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Adsorption of Uranyl on Gibbsite:A Time-Resolved Laser-Induced Fluorescence Spectroscopy Study

机译：铀矿在三水铝石上的吸附：时间分辨激光诱导荧光光谱研究

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摘要

Uranyl adsorbed on gibbsite at pH 4.0-8.0 and ionic strengths (ISs) 0.001-0.4 M (NaClO_4) in the absence of carbonate was studied using time-resolved laser-induced fluorescence spectroscopy (TRLIFS) under cryogenic conditions.TRLIFS data showed the presence of several distinct emission components.Their contributions were determined using the evolving factor analysis approach.Four components denoted as species A,B,C,and D were discerned.Each of them was characterized by a characteristic response to pH and IS changes and also by a unique combination of the values of the fundamental transition energy E_o,o,vibronic spacing DELTA_E,and half-width of the vibronic lines DELTAW.Species A and B were major contributors to the overall emission.They were mainly affected by the pH and predominated below and above pH 5.O,respectively.In contrast with that,the contribution of species C was noticeable only at IS = 0.001 M,while it was suppressed or absent at high IS values.It was concluded that species A and B are likely to correspond to inner-sphere surface aluminol complexes ident to AI0-(UO_2)~+ and ident to AIO- (UO_2)OH~deg,while species C was hypothesized to correspond to electrostatically bound uranyl complexes (predominantly [UO_2(OH)_3]~-).
机译：在低温条件下使用时间分辨激光诱导荧光光谱法（TRLIFS）研究了在不存在碳酸盐的条件下pH 4.0-8.0和离子强度（ISs）0.001-0.4 M（NaClO_4）吸附在三水铝石上的铀酰.TRLIFS数据表明存在通过进化因子分析法确定了它们的贡献，识别出了分别表示为物种A，B，C和D的四个组分，每个组分都具有对pH和IS变化的特征响应，以及基本跃迁能E_o，o，振动间隔DELTA_E和振动线DELTAW的一半宽度的独特组合。物种A和B是总排放的主要贡献者，它们主要受pH值的影响并且占主导地位分别低于和高于pH5.O。与此相反，仅在IS = 0.001 M时，物种C的贡献才显着，而在高IS值时，C的贡献被抑制或不存在。 es A和B可能对应于与AI0-（UO_2）〜+相同且与AIO-（UO_2）OH-deg相同的内球表面铝醇配合物，而假设物质C与静电结合的铀酰配合物相对应（主要是[UO_2（OH）_3]〜-）。

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  • 来源
    《Environmental Science & Technology》 |2006年第4期|p.1244-1249|共6页
  • 作者

    HYUN-SHIK CHANG; GREGORY V.KORSHIN; ZHEMING WANG; JOHN M.ZACHARA;

  • 作者单位

    Department of Civil and Environmental Engineering,Box 352700,University of Washington,Seattle,Washington 98115-2700,and Pacific Northwest National Laboratory,P.O.Box 999/MS K8-96,Richland,Washington 99352;

    Department of Civil and Environmental Engineering,Box 352700,University of Washington,Seattle,Washington 98115-2700,and Pacific Northwest National Laboratory,P.O.Box 999/MS K8-96,Richland,Washington 99352;

    Department of Civil and Environmental Engineering,Box 352700,University of Washington,Seattle,Washington 98115-2700,and Pacific Northwest National Laboratory,P.O.Box 999/MS K8-96,Richland,Washington 99352;

    Department of Civil and Environmental Engineering,Box 352700,University of Washington,Seattle,Washington 98115-2700,and Pacific Northwest National Laboratory,P.O.Box 999/MS K8-96,Richland,Washington 99352;

  • 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 环境化学;
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