Honeycombed Au@C-TiO2-Xcatalysts for enhanced photocatalytic mineralization of Acid red 3R under visible light

Hengli Qian; Qidong Hou; Erhong Duan; Jianrui Niu; Yifan Nie; Chuanyunlong Bai; Xinyu Bai; Meiting Ju

doi:10.1016/j.jhazmat.2020.122246

Honeycombed Au@C-TiO_2-Xcatalysts for enhanced photocatalytic mineralization of Acid red 3R under visible light

J Hazard Mater. 2020 Jun 5:391:122246. doi: 10.1016/j.jhazmat.2020.122246. Epub 2020 Feb 5.

Authors

Hengli Qian¹, Qidong Hou², Erhong Duan³, Jianrui Niu³, Yifan Nie¹, Chuanyunlong Bai¹, Xinyu Bai¹, Meiting Ju⁴

Affiliations

¹ Tianjin Engineering Research Center of Biomass Solid Waste Resources Technology, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; National & Local Joint Engineering Research Center of Biomass Resource Utilization, Tianjin 300350, China.
² Tianjin Engineering Research Center of Biomass Solid Waste Resources Technology, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; National & Local Joint Engineering Research Center of Biomass Resource Utilization, Tianjin 300350, China. Electronic address: houqidong@nankai.edu.cn.
³ School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, China.
⁴ Tianjin Engineering Research Center of Biomass Solid Waste Resources Technology, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; National & Local Joint Engineering Research Center of Biomass Resource Utilization, Tianjin 300350, China. Electronic address: jumeit@nankai.edu.cn.

PMID: 32059162
DOI: 10.1016/j.jhazmat.2020.122246

Abstract

The mineralization of organic pollutants under visible light is challenging, limiting the practical application of photocatalytic technology in wastewater treatment. To achieve the efficient mineralization of Acid red 3R (AR3R), a series of honeycombed catalysts (TiO₂, C-TiO_2-X, Au@TiO₂ and Au@C-TiO_2-X) were prepared via a facile in situ synthetic method and characterized by XRD, TEM, BET, XPS and DRS, respectively. The introduction of C and Au species promote the simultaneous generation of •O₂^- and •OH over Au@C-TiO_2-X under visible light radiation. The Au@C-TiO_2-X catalyst showed superior performance for the deep mineralization of AR3R, affording a TOC removal rate larger than 90 % within 240 min under visible light (> 420 nm). The photocatalytic degradation mechanism of AR3R is proposed according to UV-vis and in situ DRIFTS analysis. The superior photocatalytic activity of Au@C-TiO_2-X is attributed to the synergistic effect of •O₂^- and •OH owing to C doping and Au deposition.

Keywords: Acid red 3R; C-TiO(2-X); Honeycombed; Photocatalysis; Structure.

Publication types

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