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首页> 外文期刊>Materials Research Bulletin >Preparation and characterization of a single-walled aluminosilicate nanotube-iron oxide composite: Its applications to removal of aqueous arsenate
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Preparation and characterization of a single-walled aluminosilicate nanotube-iron oxide composite: Its applications to removal of aqueous arsenate

机译：单壁铝硅酸盐纳米管-氧化铁复合材料的制备与表征：在去除砷酸水溶液中的应用

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摘要

A chemical method to synthesize a magnetite coating on aluminosilicate nanotubes (imogolite) that can be used as a magnetic adsorptive composite is reported via a new procedure based on impregnation with excess of solvent. This produced a nanocomposite of imogolite and magnetite, retaining at least two of the individual properties of its initial chemical species, which are determinant for some technological applications: large surface area and high saturation magnetization. Comparatively significant differences in terms of electrophoretic and magnetic characteristics were found between the direct solid mixture of the starting materials and the resultant imogolite-magnetite mixture. The adsorption kinetics of arsenate is described adequately by the pseudo-second model and the maximum adsorbed amounts (q_e) of this anion were closed to those obtained experimentally. A high rate of arsenate adsorption on Fe-imogolite was initially observed, suggesting that the formation of new surface sites qualitatively and quantitatively improve the removal of arsenate. The combined use of different characterization techniques (XRD, TEM, Moessbauer spectroscopy, EM, VSM and SQUID) and the kinetic sorption study suggest that Fe-imogolite has a large potential for the treatment of arsenate polluted water or other nanotechnological applications, due to its high chemical reactivity.
机译：通过基于过量溶剂浸渍的新方法，报道了一种化学方法来合成铝硅酸盐纳米管（伊莫石）上的磁铁矿涂层，该涂层可用作磁性吸附复合材料。这产生了伊莫高岩和磁铁矿的纳米复合材料，保留了其初始化学物种的至少两个独立属性，这对于某些技术应用是决定性的：大表面积和高饱和磁化强度。在起始原料的直接固体混合物和所得的伊莫石-磁铁矿混合物之间发现了在电泳和磁特性方面的相对显着差异。拟秒模型充分描述了砷酸盐的吸附动力学，该阴离子的最大吸附量（q_e）与实验获得的接近。最初观察到高砷酸盐吸附在铁-堇青石上，表明定性和定量地形成新的表面位点改善了砷酸盐的去除。结合使用不同的表征技术（XRD，TEM，Moessbauer光谱学，EM，VSM和SQUID）和动力学吸附研究表明，由于铁易蒙脱石具有以下特征，因此具有处理砷污染水或其他纳米技术应用的巨大潜力。高化学反应性。

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  • 来源
    《Materials Research Bulletin》 |2014年第3期|145-152|共8页
  • 作者

    Nicolas Arancibia-Miranda; Mauricio Escudey; Carmen Pizarro; Juliano C. Denardin; Maria Teresa Garcia-Gonzalez; Jose D. Fabris; Laurent Charlet;

  • 作者单位

    Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124 Santiago, Chile;

    Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124 Santiago, Chile Facultad de Quimica y Biologia, Universidad de Santiago de Chile, Av. B. O'Higgins, 3363 Santiago, Chile;

    Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124 Santiago, Chile Facultad de Quimica y Biologia, Universidad de Santiago de Chile, Av. B. O'Higgins, 3363 Santiago, Chile;

    Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124 Santiago, Chile;

    Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Cientificas, Serrano 115-dup., 28006 Madrid, Spain;

    Federal University of Jequitinhonha and Mucuri Valleys (UFVJM), Diamantina, Minas Gerais, Brazil;

    Department of Earth and Planetary Science (LGIT-OSUG), University of Grenoble-I, BP-53, 38041 Grenoble, France;

  • 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

    A. Amorphous materials; A. Magnetic materials; C. Moessbauer spectroscopy; D. Magnetic properties; D. Surface properties;

    机译：A.非晶态材料;A.磁性材料;C. Moessbauer光谱;D.磁性能;D.表面性质;

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