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首页> 外文期刊>RSC Advances >Adsorption and reduction of hexavalent chromium on magnetic greigite (Fe3S4)-CTAB: leading role of Fe(ii) and S(-ii)
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Adsorption and reduction of hexavalent chromium on magnetic greigite (Fe3S4)-CTAB: leading role of Fe(ii) and S(-ii)

机译：磁性greigite（Fe3S4）-CTAB的吸附和还原六价铬：Fe（II）和S（-ii）的主要作用

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摘要

In this study, a facile one-step route was used to synthesize a novel magnetic mesoporous greigite (Fe3S4)-CTAB composite, which was utilized to remove hexavalent chromium (Cr(vi)). The optimized Fe3S4-CTAB(0.75) composite with a CTAB dosage of 0.75 g possessed the maximum specific surface, showing the highest Cr(vi) adsorption capacity of 330.03 mg g(-1). The mechanism analysis revealed that Fe(ii) and S(-ii) were critical for the reduction of Cr(vi). CTAB can promote the removal of Cr(vi) by Fe3S4-CTAB composites, possibly due to increased S(-ii) concentration, better dispersion of nanoparticles, and greater zeta potential. Besides, there is mild effect of Fe-0 on Cr(vi) removal, which is confirmed by the disappearance of the Fe-0 peak from the XPS analysis. The pseudo-second-order kinetic model could explain the Cr(vi) removal processes well. The adsorption of Cr(vi) at different initial concentrations was more consistent with a Langmuir isotherm. The existence of H+ was beneficial for Cr(vi) removal by Fe3S4-CTAB(0.75). Our work confirmed that the obtained Fe3S4-CTAB(0.75) composites exhibit considerable potential for Cr(vi) removal from aqueous solution.
机译：在这项研究中，一个浅显的一步生产用于合成的新的磁介孔硫复铁矿（Fe3S4）-CTAB复合，将其用于去除六价铬铬（Cr（VI））。优化Fe3S4-CTAB（0.75）复合材料的0.75 g的CTAB剂量具有的最大比表面积，显示出的330.03毫克克（-1）的最高铬（VI）的吸附能力。该机制分析表明，铁（II）和S（-ii）为对于Cr的还原（VI）是至关重要的。 CTAB可促进通过Fe3S4-CTAB复合材料中除去铬（VI）的，可能是由于增加了S（-ii）浓度，纳米颗粒的更好的分散，和更大的ζ电势。此外，还有为Fe-0上的Cr（VI）的去除，轻度效应，其是通过从XPS分析中的Fe-0峰的消失确认。伪二级动力学模型可以解释的Cr（VI）去除过程良好。铬（VI）在不同初始浓度的吸附用Langmuir等温更加一致。 H +的存在是通过Fe3S4-CTAB（0.75）的Cr（VI）的去除是有利的。我们的工作证实，所得Fe3S4-CTAB（0.75）复合材料具有从水溶液的Cr（VI）的去除相当大的潜力。

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  • 来源
    《RSC Advances》 |2018年第55期|共7页
  • 作者

    Zhou Yanxia; Zhao Yiting; Wu Xiaoge; Yin Weiqin; Hou Jianhua; Wang Shengsen; Feng Ke; Wang Xiaozhi;

  • 作者单位

    Yangzhou Univ Coll Environm Sci &

    Engn Yangzhou 225127 Jiangsu Peoples R China;

    Yangzhou Univ Coll Environm Sci &

    Engn Yangzhou 225127 Jiangsu Peoples R China;

    Yangzhou Univ Coll Environm Sci &

    Engn Yangzhou 225127 Jiangsu Peoples R China;

    Yangzhou Univ Coll Environm Sci &

    Engn Yangzhou 225127 Jiangsu Peoples R China;

    Yangzhou Univ Coll Environm Sci &

    Engn Yangzhou 225127 Jiangsu Peoples R China;

    Yangzhou Univ Coll Environm Sci &

    Engn Yangzhou 225127 Jiangsu Peoples R China;

    Yangzhou Univ Coll Environm Sci &

    Engn Yangzhou 225127 Jiangsu Peoples R China;

    Yangzhou Univ Coll Environm Sci &

    Engn Yangzhou 225127 Jiangsu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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