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Three-dimensional honeycomb-like porous carbon derived from corncob for the removal of heavy metals from water by capacitive deionization.


ABSTRACT: 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.

SUBMITTER: Zhang XF 

PROVIDER: S-EPMC9076976 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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Three-dimensional honeycomb-like porous carbon derived from corncob for the removal of heavy metals from water by capacitive deionization.

Zhang X F XF   Wang B B   Yu J J   Wu X N XN   Zang Y H YH   Gao H C HC   Su P C PC   Hao S Q SQ  

RSC advances 20180104 3


In this study, porous carbon (3DHPC) with a 3D honeycomb-like structure was synthesized from waste biomass corncob <i>via</i> 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<sup>2</sup> g<sup>-1</sup>). Electrochemical tests showed that the 3DHPC electrode exhibited a specific capacitance  ...[more]

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