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首页> 外文期刊>RSC Advances >One-step synthesis of Fe2O3 nano-rod modified reduced graphene oxide composites for effective Cr(vi) removal: removal capability and mechanism
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One-step synthesis of Fe2O3 nano-rod modified reduced graphene oxide composites for effective Cr(vi) removal: removal capability and mechanism

机译：Fe2O3纳米棒的一步合成改性的石墨烯氧化物复合材料用于有效Cr（VI）去除：去除能力和机理

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摘要

Reduced graphene oxide (rGO) supported Fe2O3 nanorod composites were prepared via a one-step hydrothermal method and further utilized for hexavalent chromium (Cr(vi)) removal from aqueous environments. The composite material exhibited an excellent removal efficiency for chromium (47.28 mg L-1), which was attributed to the electrostatic attraction and chemical reduction of chromium by the material. The removal mechanism was studied by SEM, BET, XPS, and FTIR. The results demonstrated that rGO was successfully modified by Fe2O3 nanorods (approximately 50 nm wide). Compared with graphene oxide (GO), the compound was much more easily separated from the solution after completing the removal. Furthermore, XPS characterization showed that Cr(vi) could also be reduced to low-toxicity Cr(iii) by hydroxyl groups. In the variables test, it was found that the removal process was pH-dependent. The results of the designed experiments for exploring the adsorption kinetics, isotherms and thermodynamics indicated that the removal process obeyed a pseudo-second-order kinetics model, Langmuir isotherm model and that it was a spontaneous exothermal process. This study provides the possibility of hydrothermal synthesis of Fe2O3/rGO for use as an excellent material to remove Cr(vi) from aqueous environments.
机译：通过一步水热法制料，制备了石墨烯氧化物（RGO）负载的Fe 2 O 3纳米棒复合材料，进一步用于从含水环境中除去六价铬（Cr（VI））。复合材料表现出铬（47.28mg L-1）的优异的去除效率，其归因于材料的静电吸引和铬的化学降低。通过SEM，BET，XPS和FTIR研究了去除机制。结果证明RGO通过Fe2O3纳米棒（约50nm宽）成功修饰。与石墨烯氧化物（GO）相比，在完成除去后，该化合物比溶液更容易分离。此外，XPS表征显示Cr（VI）也可以通过羟基降至低毒性Cr（III）。在变量测试中，发现去除过程依赖于pH依赖性。设计实验的结果探索吸附动力学，等温线和热力学表明，去除过程遵循了伪二阶动力学模型，朗马尔等温线模型，这是一种自发放热过程。该研究提供了水热合成Fe2O3 / RGO的可能性，用作优异的材料，以从水性环境中除去Cr（VI）。

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  • 来源
    《RSC Advances》 |2019年第36期|共11页
  • 作者

    Kong Chaopei; Li Miao; Li Jiacheng; Ma Xuejiao; Feng Chuanping; Liu Xiang;

  • 作者单位

    Tsinghua Univ Sch Environm Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Environm Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Environm Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Environm Beijing 100084 Peoples R China;

    China Univ Geosci Beijing Sch Water Resources &

    Environm Beijing 100083 Peoples R China;

    Tsinghua Univ Sch Environm Beijing 100084 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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