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Cr(VI) removal by mesoporous FeOOH polymorphs: performance and mechanism

机译：CR（vi）由中孔FeoOH多晶型物去除：性能和机制

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摘要

The mesoporous FeOOH polymorphs, i.e., goethite (alpha-FeOOH), akaganeite (beta-FeOOH), lepidocrocite (gamma-FeOOH), and feroxyhyte (delta-FeOOH) were synthesized and characterized before and after reaction with Cr(VI) by scanning electron microscopy (SEM), N-2 adsorption-desorption isotherms, X-ray diffraction (XRD), saturation magnetization measurements, and X-ray photoelectron spectroscopy (XPS). The Cr(VI) removal efficiencies by these four FeOOH polymorphs were investigated. After reaction for 120 min, the Cr(VI) removal efficiencies by alpha-FeOOH, beta-FeOOH, gamma-FeOOH, and delta-FeOOH were 94.5%, 52.0%, 100%, and 84.6%, respectively. The Cr(VI) removal efficiencies by these four FeOOH polymorphs were influenced by their specific surface area. The XPS analysis indicated that the removal of Cr(VI) by these FeOOH polymorphs was a process of electrostatic attraction and ligand exchange. The study of this paper can reveal the reaction mechanism of FeOOH with Cr(VI) and the different behaviors of the four FeOOH polymorphs in the removal of Cr(VI).
机译：通过扫描合成合成介孔FeOOH多晶型物，即甲酸酯（α-FeO​​H），阿卡酮（Beta-FeOH），尿道膜（β-FeOH），尿道膜（γ-FeOH）和对Cr（vi）反应之前和后的反应电子显微镜（SEM），N-2吸附 - 解吸等温，X射线衍射（XRD），饱和磁化测量和X射线光电子谱（XPS）。研究了这四种FeOOH多晶型物的Cr（VI）去除效率。反应120分钟后，Cr（VI）通过α-FeO​​OH，β-FeOH，γ-FeOH和Delta-FeoH和Delta-FeOH的效率分别为94.5％，52.0％，100％和84.6％。这四种FeOOH多晶型物的Cr（VI）去除效率受到其特定表面积的影响。 XPS分析表明，通过这些FeOOH多晶型物去除Cr（VI）是静电吸引力和配体交换的过程。本文的研究可以揭示与Cr（VI）的FeOOH的反应机理和四种FeOOH多晶型物的不同行为在去除Cr（VI）中。

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  • 来源
    《RSC Advances》 |2016年第85期|共13页
  • 作者

    Wu Shijiao; Lu Jianwei; Ding Zecong; Li Na; Fu Fenglian; Tang Bing;

  • 作者单位

    Guangdong Univ Technol Inst Environm Hlth &

    Pollut Control Sch Environm Sci &

    Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Inst Environm Hlth &

    Pollut Control Sch Environm Sci &

    Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Inst Environm Hlth &

    Pollut Control Sch Environm Sci &

    Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Inst Environm Hlth &

    Pollut Control Sch Environm Sci &

    Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Inst Environm Hlth &

    Pollut Control Sch Environm Sci &

    Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Inst Environm Hlth &

    Pollut Control Sch Environm Sci &

    Engn Guangzhou 510006 Guangdong Peoples R China;

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