Novel Electrochemical Preparation of N-Doped TiO 2 /Graphene for Enhanced Stability and Photocatalysis Degradation of Humic Acid

Anqi Wang, Wei Chen, Nannan Geng, Xiaomeng Lan, Mingxiang Liu () and Xing Wu ()
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Anqi Wang: College of Environment, Hohai University, Nanjing 210098, China
Wei Chen: College of Environment, Hohai University, Nanjing 210098, China
Nannan Geng: College of Environment, Hohai University, Nanjing 210098, China
Xiaomeng Lan: College of Environment, Hohai University, Nanjing 210098, China
Mingxiang Liu: College of Environment, Hohai University, Nanjing 210098, China
Xing Wu: CSIRO Manufacturing, Private Bag 10, Clayton South, VIC 3169, Australia

Sustainability, 2022, vol. 14, issue 17, 1-16

Abstract: Industrialization and urbanization have resulted in large volumes of municipal wastewater containing abundant refractory humic acid (HA), which is difficult to biodegrade with carcinogenic byproducts and has posed a great threat to human health. Photocatalysis is a promising advanced oxidation process (AOP) for the efficient degradation of HA. In this work, a novel three-step electrochemical method was employed to fabricate electrochemically converted N-doped TiO 2 nanotubes/graphene (ENTG) composite film. Compared with traditional hydrothermally synthesized N-doped TiO 2 /graphene (NTG) nanoparticles, the ENTG photocatalyst exhibited enhanced degradation performance, recyclability and stability. It was found that ETNG can extend the range of light absorption to over 400 nm and narrow the band gap to 2.7 eV. The degradation rate for HA was up to 92.3% under the optimum condition. The preparation mechanism for ENTG is based on an electrochemical reduction–deposition hypothesis, while the degradation mechanism is dependent on adsorption and free radical oxidation. According to a free radical quenching test, both •OH and •O 2 − radicals were produced, and •OH played the dominant role in HA degradation. In general, ENTG is a promising photocatalyst for further application in municipal wastewater treatment.

Keywords: electrochemically fabricated; N-doped TiO 2 /graphene; photocatalytic degradation; humic acid; municipal wastewater treatment (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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