Study on photocatalytic oxidation for determination of the low chemical oxygen demand using a nano-TiO2-Ce(SO4)2 coexisted system |
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| Authors: | Chai Yihao Ding Hongchun Zhang Zhonghai Xian Yuezhong Pan Zhensheng Jin Litong |
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| Institution: | Department of Chemistry, East China Normal University, ZhongShan Road North 3663, Shanghai 200062, China |
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| Abstract: | A new photocatalytic system, nano-TiO2-Ce(SO4)2 coexisted system, which can be used to determine the low chemical oxygen demand (COD) is described. Nano-TiO2 powders is used as photocatalyst in this system. The measuring method is based on direct determination of the concentration change of Ce(IV) resulting from photocatalytic oxidation of organic compounds. The mechanism of the photocatalytic oxidation for COD determination was discussed and the optimum experimental conditions were investigated. Under the optimum conditions, a good calibration graph for COD values between 1.0 and 12 mg l−1 was obtained and the LOD value was achieved as low as 0.4 mg l−1. When determining the real samples, the results were in good agreement with those from the conventional methods. |
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| Keywords: | Chemical oxygen demand (COD) Photocatalytic oxidation TiO2 Ce(IV) Synergistic reaction Ultraviolet spectrophotometry |
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