Photocatalytic Degradation Of Organic Pollutants And Detection Of Chemical Oxygen Demand By Fluorescence Methods

摘要

TiO_2 photocatalyst was used to degrade organic pollutants in aqueous solutions and the detection of chemical oxygen demand was studied by fluorescence method. It was found that TiO_2 dosage, initial solution pH, initial concentration electron acceptor Ce~(4+) the time of UV light irradiation and the temperature of solution affected the degradation of the organic pollutants. The optimum conditions were obtained at amounts of TiO_2 1.0gl~(-1), pH 0.38, Ce~(4+) 6.0mmoll~(-1), time 10min and temperature 80 C, respectively. The produced Ce~(3+) was determined by fluorescence method, with the maximum excitation and emission wavelengths at 264.8 and 362.1 nm, respectively. The fluorescence intensity was linear with COD in 0~100.0 mg l~(-1). The limit of detection was 0.9 mg l~(-1). This method was applied in detection of COD in samples of lake water and simulate sewage.