Ferrate(VI) enhanced photocatalytic oxidation of pollutants in aqueous TiO2 suspensions |
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| Authors: | Virender K. Sharma Nigel J. D. Graham Xiang-Zhong Li Bao-Ling Yuan |
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| Affiliation: | (1) Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901, USA;(2) Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;(3) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China;(4) State Key Laboratory Breeding Base of Photocatalysis, Department of Environmental Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China |
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| Abstract: | Background, aim and scope Photocatalytic oxidation using UV irradiation of TiO2 has been studied extensively and has many potential industrial applications, including the degradation of recalcitrant contaminants in water and wastewater treatment. A limiting factor in the oxidation process is the recombination of conduction band electrons (e − cb) with electron holes (hvb+) on the irradiated TiO2 surface; thus, in aqueous conditions, the presence of an effective electron scavenger will be beneficial to the efficiency of the oxidation process. Ferrate (FeO42−) has received much recent attention as a water treatment chemical since it behaves simultaneously as an oxidant and coagulant. The combination of ferrate [Fe(VI)] with UV/TiO2 photocatalysis offers an oxidation synergism arising from the Fe(VI) scavenging of e − cb and the corresponding beneficial formation of Fe(V) from the Fe(VI) reduction. This paper reviews recent studies concerning the photocatalytic oxidation of problematic pollutants with and without ferrate. |
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