title: Oxidation of bisphenol A by UV/S2O8(2-): comparison with UV/H2O2.
abstract: The UV/S2O8(2-) 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/S2O8(2-) was increased by increasing S2O8(2-) concentration or decreasing BPA concentration. The presence of humic acid caused an inhibitory effect. The BPA oxidation rate by UV/S2O8(2-) 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/S2O8(2-) system was sulphate radical (SO4(-*)), whereas the main oxidizing species in the UV/H2O2 system was OH radical (OH*). Compared with UV/H2O2, the UV/S2O8(2-) process showed higher performance for not only BPA degradation but also its mineralization, which means that SO4(-*) is a more effective oxidant for BPA than the OH*. The results shown in this study imply that the SO4(-*) -based UV/S2O8(2-) process can be an excellent alternative process for the widely used UV/H2O2 process, with higher remediation performance.
authors.affiliation: Water Environmental Centre, Korea Institute of Science and Technology (KIST), 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Sung-Hwan
authors.initials: SH
authors.lastname: Yoon
authors.forename: Seongpil
authors.initials: S
authors.lastname: Jeong
authors.forename: Seockheon
authors.initials: S
authors.lastname: Lee
mesh_terms: D001559:Benzhydryl Compounds; D052244:Endocrine Disruptors / Q000737:chemistry* / Q000528:radiation effects; D000431:Ethanol / Q000737:chemistry; D006812:Humic Substances; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D010636:Phenols / Q000737:chemistry* / Q000528:radiation effects; D013431:Sulfates / Q000737:chemistry*; D014466:Ultraviolet Rays; D020002:tert-Butyl Alcohol / Q000737:chemistry; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D052244:Endocrine Disruptors; D000431:Ethanol; D006812:Humic Substances; D006861:Hydrogen Peroxide; D010636:Phenols; D013431:Sulfates; D020002:tert-Butyl Alcohol; C069025:sulfate radical; C006780:bisphenol A; D000098826:Bisphenol A Compounds