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[Photodegradation of phthalic acid esters in water]
Xiaoyu Hu1, Kerong Zhang, Bo Zheng
1Department of Sanitary Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
Objective:
To investigate the environmental degradation process of phthalic acid esters (PAEs).
Methods:
The PAEs were detected by HPLC. We used the system of ultraviolet light, TiO2 and hydrogen peroxide to promote the photodegradation of PAEs in water.
Results:
The photodegradation of PAEs was consistent with the first level kinetics. The maximal photodegradation of PAEs occurred at the 2.0 g/L of TiO2, pH 6.0, and 2.0% of H2O2. The importance of these environmental factors in promoting the photodegradation of PAEs were in the following orders: initial concentration of PAEs, radiation time, pH value, concentration of H2O2, and concentration of TiO2.
Conclusion:
The system of ultraviolet light, TiO2 and hydrogen peroxide was effective in promoting the photodegradation of PAEs.