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首页> 外文期刊>Journal of Hazardous Materials >Chromium immobilization in soil using quaternary ammonium cations modified montmorillonite: Characterization and mechanism
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Chromium immobilization in soil using quaternary ammonium cations modified montmorillonite: Characterization and mechanism

机译：季铵阳离子改性蒙脱土固定铬在土壤中的特性与机理

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摘要

The potential risk of heavy metal in soil can be reduced by stabilization techniques. Stabilizing amendments, montmorillonites modified with tetramethylammonium (TMA) and hexadecyltrimethylammonium (HDTMA) at different loadings were prepared, characterized and assayed for remediation of hexavalent chromium contaminated soil. Characterization results demonstrated that TMA modification resulted in increased surface area and pore volume, whereas HDTMA modification resulted in decreased surface area and pore volume. For HDTMA modified montmorillonites (H-Monts), the arrangement model of surfactant molecules and the structural characteristics strongly depended on the surfactant loading density. Less pronounced packing density dependence was observed for TMA modified montmorillonites (T-Monts). Modified toxicity characteristic leaching procedure (TCLP) was utilized to evaluate the chromium immobilizing capacity of the prepared organo-montmorillonites, and the results revealed that both T-Monts and H-Monts can be reasonably effective in chromium stabilization under different leaching condition. The comparison of chromium leaching behavior manifested by T-Monts and H-Monts suggested that mechanisms for chromium immobilization by organo-montmorillonites amendment proceeded via two adsorption approaches. Each approach involves different functional groups, depending on the leaching pH and surfactant loading concentration. In addition, the effect of HDTMA loading concentration, amendment dosage, initial chromium concentration and incubation time on the immobilizing efficiency of H-Monts was investigated. (C) 2016 Elsevier B.V. All rights reserved.
机译：土壤中重金属的潜在风险可以通过稳定化技术来降低。制备了稳定剂，用四甲基铵（TMA）和十六烷基三甲基铵（HDTMA）改性的蒙脱土在不同的负载量下进行了改性，表征和分析，以修复六价铬污染的土壤。表征结果表明，TMA修饰导致表面积和孔体积增加，而HDTMA修饰导致表面积和孔体积减小。对于HDTMA改性的蒙脱土（H-Monts），表面活性剂分子的排列模型和结构特征在很大程度上取决于表面活性剂的负载密度。对于TMA改性的蒙脱石（T-Monts），观察到不太明显的堆积密度依赖性。采用改进的毒性特征浸出法（TCLP）评价了制备的有机蒙脱土的铬固定能力，结果表明，在不同浸出条件下，T-Monts和H-Monts均可有效地稳定铬。由T-Monts和H-Monts表现出的铬浸出行为的比较表明，有机蒙脱土修饰剂固定铬的机理是通过两种吸附方法进行的。每种方法都涉及不同的官能团，具体取决于浸提pH和表面活性剂的负载浓度。此外，研究了HDTMA负载浓度，修饰剂量，初始铬浓度和孵育时间对H-Monts固定化效率的影响。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2017年第5期|73-80|共8页
  • 作者

    Yang Jie; Yu Kai; Liu Cun;

  • 作者单位

    Shanghai Acad Environm Sci, Shanghai 200233, Peoples R China;

    Shanghai Acad Environm Sci, Shanghai 200233, Peoples R China;

    Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R 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

    Montmorillonite; Modification; Soil chromium; Immobilization; pH;

    机译：蒙脱石改性土壤铬固定化pH;

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