title: Oxidative degradation of dimethylsulfoxide by locally concentrated hydroxyl radicals in streamer corona discharge process.
abstract: This study systematically investigates the characteristic degradation behaviors of dimethylsulfoxide (DMSO) by the streamer corona discharge process (SCDP) in water. The analysis of the oxidized intermediates of DMSO shows that hydroxyl radical (*OH) is the main oxidant responsible for the degradation of DMSO in the SCDP. The various experiments on the degradation and mineralization of DMSO, and the effect of the *OH scavenger suggest that the SCDP produces locally concentrated *OHs in and around the plasma channel. This explanation was also supported by the formation of H(2)O(2) and the effect of the *OH scavenger on the H(2)O(2) production rate in the SCDP. Based on the kinetic data for the degradation of DMSO and the production of H(2)O(2) in the SCDP, the volume of the active region in which the *OHs are concentrated, and the effective concentration of *OH in that region were estimated to be 0.21 microl and 5.0 x 10(-3)M, respectively. This level of *OH concentration in the SCDP is approximately 10(7)-10(9) times higher than that generated in ordinary advanced oxidation processes using *OH. The ramifications of the results obtained in this study on successful water treatment using the SCDP are also discussed.
authors.affiliation: School of Chemical and Biological Engineering, College of Engineering, Seoul National University, San 56-1, Shilli-dong, Gwanak-gu, Seoul 151-742, Republic of Korea.
authors.forename: Changha
authors.initials: C
authors.lastname: Lee
authors.forename: Yunho
authors.initials: Y
authors.lastname: Lee
authors.forename: Jeyong
authors.initials: J
authors.lastname: Yoon
mesh_terms: D004121:Dimethyl Sulfoxide / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry*; D010084:Oxidation-Reduction; D010472:Perchlorates / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D010472:Perchlorates; D012997:Solvents; D014874:Water Pollutants, Chemical; C001473:iron perchlorate; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D004121:Dimethyl Sulfoxide