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首页> 外文期刊>Journal of Hazardous Materials >Enhanced sorption of radiocobalt from water by Bi(III) modified montmorillonite: A novel adsorbent
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Enhanced sorption of radiocobalt from water by Bi(III) modified montmorillonite: A novel adsorbent

机译：Bi（III）改性蒙脱石增强水中放射性钴的吸附：一种新型吸附剂

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摘要

In this study, Ca-montmorillonite (Ca-Mt) modified with Bi~(3+) was used as a novel adsorbent for the sorption of Co(II) from aqueous solutions. The sorption of Co(Ⅱ) on Bi-montmorillonite (Bi-Mt) was investigated as a function of contact time, pH, ionic strength, adsorbent content, Co(Ⅱ) concentrations, fulvic acid (FA) and temperature. Compared to Ca-Mt, Bi-Mt showed a higher affinity to bind Co(Ⅱ) ions. The sorption percentage of Co(Ⅱ) on Bi-Mt increased with increasing pH at pH 3.0-8.5, and then maintained the high level at pH 8.5-12. The sorption of Co(Ⅱ) on Bi-Mt was dependent on ionic strength at low pH, and independent of ionic strength at high pH. The presence of FA enhanced Co(II) sorption at low pH, but suppressed Co(Ⅱ) sorption at high pH. The thermodynamic data derived from temperature dependent sorption isotherms suggested that the sorption of Co(Ⅱ) on Bi-Mt was spontaneous and endothermic process. Outer-sphere surface complexation and/or ion exchange were the main mechanisms of Co(Ⅱ) sorption on Bi-Mt at low pH, whereas inner-sphere surface complexation was the main sorption mechanism at high pH. From the experimental results, it is possible to conclude that Bi-Mt is suitable for application of Co(Ⅱ) removal from aqueous solutions.
机译：在这项研究中，用Bi〜（3+）改性的Ca-蒙脱石（Ca-Mt）被用作从水溶液中吸附Co（II）的新型吸附剂。研究了钴（Ⅱ）在蒙脱土（Bi-Mt）上的吸附量与接触时间，pH，离子强度，吸附剂含量，钴（Ⅱ）浓度，富里酸（FA）和温度的关系。与Ca-Mt相比，Bi-Mt具有更高的结合Co（Ⅱ）离子的亲和力。在pH 3.0-8.5时，Co（Ⅱ）在Bi-Mt上的吸附率随pH的增加而增加，在pH 8.5-12时保持较高的水平。 Co（Ⅱ）在Bi-Mt上的吸附取决于低pH下的离子强度，而与高pH下的离子强度无关。 FA的存在增强了低pH条件下Co（II）的吸附，但抑制了高pH条件下Co（Ⅱ）的吸附。由温度依赖性吸附等温线得出的热力学数据表明，Co（Ⅱ）在Bi-Mt上的吸附是自发的并且是吸热过程。低pH下Bi-Mt的外层表面络合和/或离子交换是Co（Ⅱ）吸附的主要机理，而高pH下内层表面络合是Bi-Mt吸附的主要机理。从实验结果可以得出结论，Bi-Mt适用于从水溶液中去除Co（Ⅱ）。

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  • 来源
    《Journal of Hazardous Materials》 |2011年第1期|p.168-175|共8页
  • 作者

    Zhiqiang Guo; Yuan Li; Shouwei Zhang; Haihong Niu; Zhesheng Chen; Jinzhang Xu;

  • 作者单位

    School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, PR China;

    State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, 030006, Taiyuan, PR China;

    School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, PR China;

    School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, PR China;

    School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, PR China;

    School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, PR China;

  • 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
  • 关键词

    co(ⅱ); sorption; bi-montmorillonite; kinetics; thermodynamic parameter;

    机译：co（ⅱ）;吸附蒙脱石动力学;热力学参数;

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