Abstract
The UV/S2O process was applied to decompose bisphenol A (BPA), which is a representative endocrine-disrupting chemical (EDC), and was comared with the UV/H2O2 process. The BPA degradation efficiency by UV/S2O was increased by increasing S2O concentration or decreasing BPA concentration. The presence of humic acid caused an inhibitory effect. The BPA oxidation rate by UV/S2O was increased in the following order: neutral pH (pH i=7)<acidic pH (pH i=4)<basic pH (pH i=10). The main oxidizing species in the UV/S2O system was sulphate radical (SO), whereas the main oxidizing species in the UV/H2O2 system was OH radical (OHċ). Compared with UV/H2O2, the UV/S2O process showed higher performance for not only BPA degradation but also its mineralization, which means that SO is a more effective oxidant for BPA than the OH ċ. The results shown in this study imply that the SO-based UV/S2O process can be an excellent alternative process for the widely used UV/H2O2 process, with higher remediation performance.
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