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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：源自玉米芯的三维蜂窝状多孔碳，用于通过电容去离子从水中去除重金属

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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 m2 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：在这项研究中，通过水热碳化结合KOH活化从废弃的生物质玉米芯合成了具有3D蜂窝状结构的多孔碳（3DHPC），并作为电容性去离子（CDI）电极材料进行了研究。所得3DHPC具有层状大孔和中孔结构，可及的比表面积大（952 m 2 g ？1 < / small>）。电化学测试表明，3DHPC电极的比电容为452 F g ？1 ，导电性能良好。此外，证明了使用3DHPC电极从水溶液中电吸附去除铬（ VI ）的可行性。在含有30 mg L ？1 铬（ VI ）的溶液中施加1.0 V电压时，3DHPC电极的去除效率更高，为91.58。与开路条件下的百分比相比。这种增强的吸附是由于铬（ VI ）与电极之间在非辅助过程中电化学辅助作用下的亲和力提高所致。因此，具有典型双层电容器性能的3DHPC电极被证明是用于电容去离子的理想电极材料。

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