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首页> 外文期刊>Environmental research >Arsenate removal from aqueous solution by montmorillonite and organo-montmorillonite magnetic materials
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Arsenate removal from aqueous solution by montmorillonite and organo-montmorillonite magnetic materials

机译：通过蒙脱土和有机蒙脱石磁性材料从水溶液中除去除去

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摘要

Magnetic-clay (MtMag) and magnetic-organoclay (O100MtMag) nanocomposites were synthesized, characterized and evaluated for arsenic adsorption. Batch arsenic adsorption experiments were performed varying pH conditions and initial As(V) concentration, while successive adsorption cycles were made in order to evaluate the materials reuse. The highest As(V) removal efficiency (9 ± 1 mg g~(-1) and 7.8 ± 0.8 mg g~(-1) for MtMag and OlOOMtMag, respectively) was found at pH 4.0, decreasing at neutral and alkaline conditions. From As(V) adsorption isotherm, two adsorption processes or two different surface sites were distinguished. Nanocomposites resulted composed by montmorillonite or organo-montmorillonite and magnetite as the principal iron oxide, with saturation magnetization of 8.5 ± 0.5 Am~2 Kg~(-1) (MtMag) and 20.3 ± 0.5 Am~2 Kg~(-1) (OlOOMtMag). Thus, both materials could be separated and recovered from aqueous solutions using external magnetic fields. Both materials allowed achieving arsenic concentrations lower than the World Health Organization (WHO) recommended concentration limit after two consecutive adsorption cycles (2.25 and 4.5 μg L~(*1) for MtMag and O100MtMag, respectively).
机译：合成，特征和评价磁性粘土（MTMAG）和磁性有机粘土（O100MTMAG）纳米复合材料以进行砷吸附。分批砷吸附实验是不同的pH条件和初始作为（v）浓度，而进行连续吸附循环以评估材料再利用。在pH 4.0中发现了最高的（v）去除效率（9±1mg g〜（-1）和7.8±0.8mg g〜（-1），在pH 4.0时发现中性和碱性条件下降。从AS（V）吸附等温线，区分两个吸附过程或两个不同的表面位点。纳米复合材料由Montmorillonite或有机锰矿和磁铁矿组成为主要氧化铁，饱和磁化为8.5±0.5Ab〜2kg〜（mtmag）和20.3±0.5AM〜2kg〜（1）（ oloomtmag）。因此，可以使用外部磁场从水溶液中分离和回收两种材料。两种材料都允许实现比世界健康组织（WHO）在两个连续吸附循环（2.25和4.5μgL〜（* 1）的推荐浓度限制的砷浓度分别用于分别为MTMAG和O100MTMAG）。

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  • 来源
    《Environmental research》 |2021年第1期|110247.1-110247.10|共10页
  • 作者

    Facundo Barraque; Maria L. Montes; Mariela A. Fernandez; Roberto Candal; Rosa M. Torres Sanchez; Jose L. Marco-Brown;

  • 作者单位

    CETMIC CICPBA CONICET CCT-La Plata Camino Centenario y 506 B1897ZCA M. B. Gonnet Argentina;

    IFLP Instituto de Fisica La Plata CONICET CCT-La Plata Departamento de Fisica Facultad de Ciencias Exactas Universidad Nacional de La Plata La Plata Argentina;

    CETMIC CICPBA CONICET CCT-La Plata Camino Centenario y 506 B1897ZCA M. B. Gonnet Argentina;

    Instituto de Investigacion e Ingenieria Ambiental IIIA Universidad Nacional de San Martin CONICET UNSAM Av. 25 de Mayo y Francia San Martin Buenos Aires Argentina;

    CETMIC CICPBA CONICET CCT-La Plata Camino Centenario y 506 B1897ZCA M. B. Gonnet Argentina;

    Instituto de Investigacion e Ingenieria Ambiental IIIA Universidad Nacional de San Martin CONICET UNSAM Av. 25 de Mayo y Francia San Martin Buenos Aires Argentina;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Montmorillonite; Organo-montmorillonite; Magnetite-clay systems; As adsorption; Surface complexes;

    机译：蒙脱石;有机莫尔米尔尼岩;磁铁粘土系统;吸附;表面复合物;

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