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首页> 外文期刊>RSC Advances >Three-dimensional honeycomb-like porous carbon derived from corncob for the removal of heavy metals from water by capacitive deionization
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Three-dimensional honeycomb-like porous carbon derived from corncob for the removal of heavy metals from water by capacitive deionization

机译：三维蜂窝状多孔碳衍生自玉米芯，用于通过电容去离子从水中除去重金属

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摘要

In this study, porous carbon (3DHPC) with a 3D honeycomb-like structure was synthesized from waste biomass corncob via hydrothermal carbonization coupled with KOH activation and investigated as a capacitive deionization (CDI) electrode material. The obtained 3DHPC possesses a hierarchal macroporous and mesoporous structure, and a large accessible specific surface area (952 m(2) g(-1)). Electrochemical tests showed that the 3DHPC electrode exhibited a specific capacitance of 452 F g(-1) and good electric conductivity. Moreover, the feasibility of electrosorptive removal of chromium(VI) from an aqueous solution using the 3DHPC electrode was demonstrated. When 1.0 V was applied to a solution containing 30 mg L-1 chromium(VI), the 3DHPC electrode exhibited a higher removal efficiency of 91.58% compared with that in the open circuit condition. This enhanced adsorption results from the improved affinity between chromium(VI) and the electrode under electrochemical assistance involving a non-faradic process. Consequently, the 3DHPC electrode with typical double-layer capacitor behavior is demonstrated to be a favorable electrode material for capacitive deionization.
机译：在该研究中，通过与KOH活化的水热碳化从废生物质玉米芯片中合成了具有3D蜂窝状结构的多孔碳（3DHPC），并作为电容去离子（CDI）电极材料进行研究。所获得的3DHPC具有层次的大孔和中孔结构，以及大的可接近的比表面积（952m（2）G（-1））。电化学测试表明，3DHPC电极表现出452V（-1）和良好的电导率的特定电容。此外，证明了使用3DHPC电极从水溶液中电清除络铬（VI）的可行性。当将1.0V施加到含有30mg L-1铬（VI）的溶液中时，3DHPC电极与开路条件相比，较高的去除效率为91.58％。这种增强的吸附是由铬（VI）和电极在涉及非法过程的电化学辅助下的改进的亲和力。因此，具有典型双层电容器行为的3DHPC电极被证明是一种用于电容去离子的有利电极材料。

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  • 来源
    《RSC Advances》 |2018年第3期|共9页
  • 作者

    Zhang X. F.; Wang B.; Yu J.; Wu X. N.; Zang Y. H.; Gao H. C.; Su P. C.; Hao S. Q.;

  • 作者单位

    Chengde Petr Coll Dept Chem Engn Xueyuan Rd Chengde Peoples R China;

    Univ Manchester Sch Chem Oxford Rd Manchester M13 9PL Lancs England;

    Harbin Engn Univ Coll Mat Sci &

    Chem Engn Harbin Heilongjiang Peoples R China;

    Chengde Petr Coll Dept Chem Engn Xueyuan Rd Chengde Peoples R China;

    Chengde Petr Coll Dept Chem Engn Xueyuan Rd Chengde Peoples R China;

    Chengde Petr Coll Dept Chem Engn Xueyuan Rd Chengde Peoples R China;

    Chengde Petr Coll Dept Chem Engn Xueyuan Rd Chengde Peoples R China;

    Chengde Petr Coll Dept Chem Engn Xueyuan Rd Chengde Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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