Combination of heterogeneous Fenton-like reaction and photocatalysis using Co-TiO₂nanocatalyst for activation of KHSO₅ with visible light irradiation at ambient conditions

Qingkong Chen; Fangying Ji; Qian Guo; Jianping Fan; Xuan Xu

doi:10.1016/j.jes.2014.03.003

Combination of heterogeneous Fenton-like reaction and photocatalysis using Co-TiO₂nanocatalyst for activation of KHSO₅ with visible light irradiation at ambient conditions

J Environ Sci (China). 2014 Dec 1;26(12):2440-50. doi: 10.1016/j.jes.2014.03.003. Epub 2014 Oct 31.

Authors

Qingkong Chen¹, Fangying Ji², Qian Guo³, Jianping Fan⁴, Xuan Xu⁴

Affiliations

¹ School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China. Electronic address: chenqingkong@126.com.
² Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China. Electronic address: jfy@cqu.edu.cn.
³ T.Y. Lin International Engineering Consulting (China) Co., Ltd, Chongqing 401121, China.
⁴ Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China.

PMID: 25499492
DOI: 10.1016/j.jes.2014.03.003

Abstract

A novel coupled system using Co-TiO₂was successfully designed which combined two different heterogeneous advanced oxidation processes, sulfate radical based Fenton-like reaction (SR-Fenton) and visible light photocatalysis (Vis-Photo), for degradation of organic contaminants. The synergistic effect of SR-Fenton and Vis-Photo was observed through comparative tests of 50mg/L Rhodamine B (RhB) degradation and TOC removal. The Rhodamine B degradation rate and TOC removal were 100% and 68.1% using the SR-Fenton/Vis-Photo combined process under ambient conditions, respectively. Moreover, based on XRD, XPS and UV-DRS characterization, it can be deduced that tricobalt tetroxide located on the surface of the catalyst is the SR-Fenton active site, and cobalt ion implanted in the TiO₂lattice is the reason for the visible light photocatalytic activity of Co-TiO₂. Finally, the effects of the calcination temperature and cobalt concentration on the synergistic performance were also investigated and a possible mechanism for the synergistic system was proposed. This coupled system exhibited excellent catalytic stability and reusability, and almost no dissolution of Co²⁺ was found.

Keywords: Cobalt; Fenton-like; Photocatalysis; Sulfate radical; Visible light.

Publication types

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

MeSH terms

Catalysis
Cobalt / chemistry*
Models, Chemical
Peroxides / chemistry*
Photolysis*
Rhodamines
Titanium / chemistry*
Waste Disposal, Fluid / methods
Water Pollutants, Chemical / chemistry*

Substances

Peroxides
Rhodamines
Water Pollutants, Chemical
titanium dioxide
peroxymonosulfate
Cobalt
Titanium
rhodamine B