Combination of heterogeneous Fenton-like reaction and photocatalysis using Co-TiO2 nanocatalyst for activation of KHSO5 with visible light irradiation at ambient conditions |
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| Authors: | Qingkong Chen Fangying Ji Qian Guo Jianping Fan and Xuan Xu |
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| Institution: | 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;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;T.Y. Lin International Engineering Consulting (China) Co., Ltd, Chongqing 401121, 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;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 |
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| Abstract: | A novel coupled system using Co-TiO2 was 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 50 mg/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 TiO2 lattice 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. |
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| Keywords: | Fenton-like Photocatalysis Cobalt Sulfate radical Visible light |
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