Surface oxygen vacancies enriched FeOOH/Bi2MoO6 photocatalysis- fenton synergy degradation of organic pollutants

Jinshan Hu; Jing Li; Jifang Cui; Weijia An; Li Liu; Yinghua Liang; Wenquan Cui

doi:10.1016/j.jhazmat.2019.121399

Surface oxygen vacancies enriched FeOOH/Bi₂MoO₆ photocatalysis- fenton synergy degradation of organic pollutants

J Hazard Mater. 2020 Feb 15:384:121399. doi: 10.1016/j.jhazmat.2019.121399. Epub 2019 Oct 13.

Authors

Jinshan Hu¹, Jing Li¹, Jifang Cui¹, Weijia An¹, Li Liu¹, Yinghua Liang¹, Wenquan Cui²

Affiliations

¹ College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials, North China University of Science and Technology, Tangshan 063210, PR China.
² College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials, North China University of Science and Technology, Tangshan 063210, PR China. Electronic address: wqcui@ncst.edu.cn.

PMID: 31653406
DOI: 10.1016/j.jhazmat.2019.121399

Abstract

To achieve rapid separation of photogenerated charges, increase photocatalytic degradation activity, a visible light-driven FeOOH/Bi₂MoO₆-OVs photocatalyst was designed and successfully fabricated via solvothermal synthesis and calcination. H₂O₂ was added under visible light irradiation to form a heterogeneous photocatalysis-Fenton synergy system. Using visible light irradiation, 10% FeOOH/Bi₂MoO₆-OVs had the best degradation activity. The removal efficiency of phenol was 100% within 3 h, which was 1.54 times and 1.33 times of the degradation efficiency of photocatalysis and Fenton alone, respectively. The catalyst has high removal activity for various pollutants and good cycle stability. Hydroxyl radicals and superoxide radicals have proven to be the main active substances and a reasonable catalytic mechanism was proposed. Surface oxygen vacancy can not only reduce the width of band gap, promote the separation and migration of photogenerated electron-hole pairs, but also make the OO bond of H₂O₂ elongate and weaken, making it easier to react with FeOOH and realize the synergistic effect of photocatalysis-Fenton. Simultaneously, the oxygen vacancies located near the valence band can capture holes, and the holes are rapidly transferred to the surface of the catalyst and participated in the degradation of pollutants.

Keywords: FeOOH/Bi(2)MoO(6)-OVs; Phenol; Photocatalysis-Fenton synergy; Surface oxygen vacancies.

Publication types

Research Support, Non-U.S. Gov't