title: A simple strategy to refine Cu2O photocatalytic capacity for refractory pollutants removal: Roles of oxygen reduction and Fe(II) chemistry.
abstract: Visible-light-driven photocatalysis is a promising technology for advanced water treatment, but it usually exhibits a low efficiency. Cu2O is a low-cost semiconductor with narrow band gap, high absorption coefficient and suitable conduction band, but suffers from low charge mobility, poor quantum yield and weak catalytic performance. Herein, the Cu2O catalytic capacity for refractory pollutants degradation is drastically improved by a simple and effective strategy. By virtue of the synergistic effects between photocatalysis and Fenton, a novel and efficient photocatalysis-driven Fenton system, PFC, is originally proposed and experimentally validated using Cu2O/Nano-C hybrids. The synergistic PFC is highly Nano-C-dependent and exhibits a significant superiority for the removal of rhodamine B and p-nitrophenol, two typical refractory pollutants in wastewater. The PFC superiority is mainly attributed to: (1) the rapid photo-electron transfer driven by Schottky-like junction, (2) the selective O2reduction mediated by semi-metallic Nano-C for efficient H2O2generation, (3) the specific H2O2activation and large OH generation catalyzed by Haber-Weiss Fenton mechanism, and (4) the accelerated Fe2+/Fe3+cycling and robust Fe2+regeneration via two additional pathways. Our findings might provide a new chance to overcome the intrinsic challenges of both photocatalysis and Fenton, as well as develop novel technology for advanced water treatment.
authors.affiliation: Department of Municipal Engineering, Hefei University of Technology, Hefei, 230009, China. Electronic address: ayzhang@hfut.edu.cn.
authors.forename: Ai-Yong
authors.initials: AY
authors.lastname: Zhang
authors.affiliation: Department of Municipal Engineering, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Yuan-Yi
authors.initials: YY
authors.lastname: He
authors.affiliation: Department of Municipal Engineering, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Tan
authors.initials: T
authors.lastname: Lin
authors.affiliation: Department of Municipal Engineering, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Nai-Hui
authors.initials: NH
authors.lastname: Huang
authors.affiliation: Department of Municipal Engineering, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Qiao
authors.initials: Q
authors.lastname: Xu
authors.affiliation: Department of Municipal Engineering, Hefei University of Technology, Hefei, 230009, China. Electronic address: jingweifeng@hfut.edu.cn.
authors.forename: Jing-Wei
authors.initials: JW
authors.lastname: Feng
keywords: Cu(2)O; Fenton; Iron; Oxygen reduction; Photochemical water treatment