首页> 外文期刊>Applied clay science >An insight into the removal of Pb(II), Cu(II), Co(II), Cd(II), Zn(II), Ag(I), Hg(I), Cr(VI) by Na(I)-montmorillonite and Ca(II)-montmorillonite
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An insight into the removal of Pb(II), Cu(II), Co(II), Cd(II), Zn(II), Ag(I), Hg(I), Cr(VI) by Na(I)-montmorillonite and Ca(II)-montmorillonite

机译:Na(I)去除Pb(II),Cu(II),Co(II),Cd(II),Zn(II),Ag(I),Hg(I),Cr(VI)的见解-蒙脱石和Ca(II)-蒙脱石

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摘要

Heavy metal pollution has attracted extensive attention due to the dangers to ecosystems and human health. In this work, Na-montmorillonite and Ca-montmorillonite were used to remove Pb(II), Cu(II), Co(II), Cd(II), Zn(II), Ag(I), Hg(I), and Cr(VI) from aqueous solution. Na-montmorillonite (Na-Mt) and Ca-montmorillonite (Ca-Mt) were characterized using X-ray diffraction, scanning electron microscopy, and nitrogen surface area. The effects of contact time and initial concentration on metal removal were studied. A pseudo-second-order kinetic model and Langmuir, Freundlich, and Dubinin-Radushkevich isotherms were used to describe the adsorption behavior. The heavy metal removal mechanism was discussed in terms of solution pH variation during the adsorption and changes of Na and Ca concentrations before and after adsorption. The results indicated the capacity of Na-Mt and Ca-Mt to Pb(II), Co(II), Cd(II), Zn(II) reached 0.262, 0.152, 0.205, 0.204, 0.151 mmol/g and 0.165, 0.104, 0.175, 0.159, 0.116 mmol/g, respectively. The calculated adsorption free energy of between 8 kJ/mol and 16 kJ/mol indicated ion exchange was the main adsorption mechanism. Besides, the role of precipitation was more important for Na-Mt heavy metal ion adsorption than for Ca-Mt. The Na-Mt was more effective for heavy metal adsorption than Ca-Mt and proved to be a potentially useful material for Pb(II), Cu(II), Co(II), Cd(II), Zn(II) removal from aqueous solution. (C) 2015 Elsevier B.V. All rights reserved.
机译:由于对生态系统和人类健康的危害,重金属污染已引起广泛关注。在这项工作中,使用钠蒙脱石和钙蒙脱石去除Pb(II),Cu(II),Co(II),Cd(II),Zn(II),Ag(I),Hg(I),水溶液中的Cr(VI)。使用X射线衍射,扫描电子显微镜和氮表面积表征了钠蒙脱石(Na-Mt)和钙蒙脱石(Ca-Mt)。研究了接触时间和初始浓度对金属去除的影响。拟二级动力学模型和Langmuir,Freundlich和Dubinin-Radushkevich等温线用于描述吸附行为。从吸附过程中溶液的pH变化以及吸附前后Na和Ca浓度的变化来讨论重金属去除机理。结果表明Na-Mt和Ca-Mt对Pb(II),Co(II),Cd(II),Zn(II)的容量分别达到0.262、0.152、0.255、0.204、0.151 mmol / g和0.165、0.104分别为0.175、0.159、0.116 mmol / g。计算出的吸附自由能在8 kJ / mol和16 kJ / mol之间,表明离子交换是主要的吸附机理。此外,沉淀作用对Na-Mt重金属离子的吸附比对Ca-Mt的更为重要。 Na-Mt对重金属的吸附比Ca-Mt更有效,并且被证明是从中去除Pb(II),Cu(II),Co(II),Cd(II),Zn(II)的潜在有用材料。水溶液。 (C)2015 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Applied clay science》 |2015年第12期|239-247|共9页
  • 作者单位

    Hefei Univ Technol, Sch Resources & Environm Engn, Lab Nanomineral & Environm Mat, Hefei, Peoples R China;

    Hefei Univ Technol, Sch Resources & Environm Engn, Lab Nanomineral & Environm Mat, Hefei, Peoples R China|Queensland Univ Technol, Fac Sci & Engn, Sch Chem Phys & Mech Engn, Brisbane, Qld 4001, Australia;

    Hefei Univ Technol, Sch Resources & Environm Engn, Lab Nanomineral & Environm Mat, Hefei, Peoples R China;

    Hefei Univ Technol, Sch Resources & Environm Engn, Lab Nanomineral & Environm Mat, Hefei, Peoples R China;

    Queensland Univ Technol, Fac Sci & Engn, Sch Chem Phys & Mech Engn, Brisbane, Qld 4001, Australia;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Heavy metal; Montmorillonite; Ion exchange; Precipitation; pH;

    机译:重金属蒙脱石离子交换沉淀pH;

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