Abstract
Designing a highly-active electro-Fenton membrane (EFM) and understanding how its microstructure controls its catalytic activity is vital for organic micropollutants treatment. Herein, an EFM based on the in-situ growth of vertical FeNi layered double hydroxide catalyst on a carbon nanotube membrane (FeNi LDH/CNTs) was constructed. The •OH catalytic activity was tailored by altering the structure and composition of the key active component, FeNi LDH. The results showed that the optimal Fe1Ni1 LDH with a highly-ordered porous honeycomb structure endowed the Fe1Ni1 LDH/CNT membrane with superior catalytic activity and favorable phenol removal efficiency (86%). The highly-ordered vertical nanosheets of Fe1Ni1 LDH made the active sites fully exposed to proceed the redox cycling of Fe3+/Fe2+ and further catalyzed •OH. The porous CNT substrate catalytically produced H2O2 and greatly enhanced the mass transfer efficiency. This study provides new insights into exploring the effect of the catalyst structure and composition on the performance of functionalized EFMs.
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