Abstract
The performance of clofibric acid (CA) degradation in Milli-Q water and wastewater treatment plant (WWTP) effluent by solar/TiO2 and solar/ZnO was investigated in summer and winter seasons. The effects of NO3− and HCO3− anions, humic acid (HA), and H2O2 on CA photocatalysis were evaluated. Significant difference in CA degradation in two seasons was observed. Both NO3− and HCO3− anions adversely affected CA degradation, particularly at high HCO3− concentration. CA degradation slightly increased with 0.5 mg L−1 HA in solar/TiO2 in summer, but was significantly inhibited in winter at 20 mg L−1 HA. However, the inhibitive effect of 20 mg L−1 HA on CA removal in solar/ZnO had no remarkable difference in two seasons. The degradation in solar/TiO2/H2O2 was similar to that in solar/TiO2, but was inhibited obviously in solar/ZnO/H2O2. When applying photocatalytic process into WWTP effluent, degradation rates were apparently lower compared to Milli-Q water and temperature caused a great adverse effect on CA elimination.
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