A simple strategy to refine Cu2O photocatalytic capacity for refractory pollutants removal: Roles of oxygen reduction and Fe(II) chemistry

• Published in: Journal of hazardous materials Vol. 330; pp. 9 - 17
• Main Authors: Zhang, Ai-Yong, He, Yuan-Yi, Lin, Tan, Huang, Nai-Hui, Xu, Qiao, Feng, Jing-Wei
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.05.2017
• Subjects: Cu2O; Fenton; Iron; Oxygen reduction; Photochemical water treatment; Oxygen reduction; Fenton; Iron; Photochemical water treatment; Cu2O
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2017.01.051

[Display omitted] •A simple strategy was proposed to improve Cu2O photochemical performance.•The photocatalysis-driven Fenton was developed for advanced water treatment.•The novel system had superior performance under visible light irradiation.•The catalytic mechanisms of novel system were elucidated and clearly presented. 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 O2 reduction mediated by semi-metallic Nano-C for efficient H2O2 generation, (3) the specific H2O2 activation 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.