首页|Controlled synthesis of ZnO modified N-doped porous carbon nanofiber membrane for highly efficient removal of heavy metal ions by capacitive deionization
Controlled synthesis of ZnO modified N-doped porous carbon nanofiber membrane for highly efficient removal of heavy metal ions by capacitive deionization
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Capacitive deionization(CDI),known as an emerging,environment-friendly,energy-efficient and cost-effective technology,has gained tremendous attention and shown great application potential in brackish water desalination.However,the limited electrical double layer(EDL)capacitance and desalination capacity of conventional carbon-based electrodes seriously affect its practical application.Here,we prepared a flexible,self-supporting,zinc oxide-modified N-doped porous carbon nanofiber membrane(ZnO@N-PCNM)as capacitive deionized electrode materials.The prepared carbon membrane possesses a large specific surface area(488.6 m~2 g~(-1))due to the interconnected and hierarchical multi-layer pores,which can provide more adsorption sites and good electronic/ion conductivity.In addition,benefiting from the high N-doping(10.9%)and the loading of Zn,the prepared ZnO@N-PCNM electrode shows a specific capacitance of 253.62 F g~(-1)in 3 M KOH electrolyte at a scanning rate of 5 mV s"1.As electrode materials for CDI,the ZnO@N-PCNM delivers an outstanding electro-sorption capacities of 32.87 mg g~(-1),23.81 mg g~(-1)and 20.85 mg g~(-1)at a low pressure of 1.8 V for heavy metal ions Pb~(2+),Cu~(2+),and Cd~(2+),respectively.These results mean that the prepared ZnO@N-PCNM membrane has great potential for Hybrid capacitive deionization practical applications.
Capacitive deionizationSupercapacitorsElectrospinningZIF-8Heavy metal ions
Yuguo Li、Ran Xu、Li Qiao
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Advanced Materials Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan,250014,PR China
NSTL
