Oxidative degradation of dimethylsulfoxide by locally concentrated hydroxyl radicals in streamer corona discharge process.

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.

[1]  T. Oppenländer.  Photochemical purification of water and air , 2003 .

[2]  C. Sonntag,et al.  OH-Radical-induced oxidation of methanesulfinic acid. The reactions of the methanesulfonyl radical in the absence and presence of dioxygen , 2001 .

[3]  T. Koito,et al.  A novel treatment technique for DMSO wastewater , 1998 .

[4]  Jeyong Yoon,et al.  Kinetics and mechanisms of DMSO (dimethylsulfoxide) degradation by UV/H2O2 process , 2004 .

[5]  W. C. Finney,et al.  Formation of hydroxyl radicals, hydrogen peroxide and aqueous electrons by pulsed streamer corona discharge in aqueous solution , 1995 .

[6]  J. S. Clements,et al.  Preliminary Investigation of Prebreakdown Phenomena and Chemical Reactions Using a Pulsed High-Voltage Discharge in Water , 1987, IEEE Transactions on Industry Applications.

[7]  G. Eisenberg.  Colorimetric Determination of Hydrogen Peroxide , 1943 .

[8]  W. C. Finney,et al.  Aqueous phase pulsed streamer corona reactor using suspended activated carbon particles for phenol oxidation : Model-data comparison , 1999 .

[9]  F. Liu,et al.  Optical study of OH radical in a wire-plate pulsed corona discharge. , 2006, Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy.

[10]  Jeyong Yoon,et al.  High temperature dependence of 2,4-dichlorophenoxyacetic acid degradation by Fe3+/H(2)O(2) system. , 2003, Chemosphere.

[11]  W. C. Finney,et al.  The role of Fenton’s reaction in aqueous phase pulsed streamer corona reactors , 2001 .

[12]  D. M. Willberg,et al.  Degradation of 4-Chlorophenol, 3,4-Dichloroaniline, and 2,4,6-Trinitrotoluene in an Electrohydraulic Discharge Reactor , 1996 .

[13]  S. Martin,et al.  Environmental Applications of Semiconductor Photocatalysis , 1995 .

[14]  Zheng-Hua He,et al.  The important role of the hydroxy ion in phenol removal using pulsed corona discharge , 2005 .

[15]  G. Buxton,et al.  Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution , 1988 .

[16]  Masayuki Sato,et al.  Advanced oxidation processes using pulsed streamer corona discharge in water , 2002 .

[17]  J. Rabani,et al.  Far-ultraviolet spectra of hydrogen and hydroxyl radicals from pulse radiolysis of aqueous solutions. Direct measurement of the rate of H + H , 1969 .

[18]  Hyung-Joon Seo,et al.  Biological treatment of wastewater containing dimethyl sulphoxide from the semi-conductor industry , 2001 .

[19]  Jeyong Yoon,et al.  Temperature dependence of hydroxyl radical formation in the hv/Fe3+/H2O2 and Fe3+/H2O2 systems. , 2004, Chemosphere.

[20]  D. M. Willberg,et al.  Oxidative Degradation of 2,4,6-Trinitrotoluene by Ozone in an Electrohydraulic Discharge Reactor , 1998 .

[21]  Jen-Shih Chang,et al.  Corona discharge processes , 1991 .

[22]  J. S. Clements,et al.  Oxidative Processes Occurring When Pulsed High Voltage Discharges Degrade Phenol in Aqueous Solution , 2000 .

[23]  M. Elovitz,et al.  Hydroxyl Radical/Ozone Ratios During Ozonation Processes. II. The Effect of Temperature, pH, Alkalinity, and DOM Properties , 2000 .

[24]  J. Sid Clements,et al.  Formation of chemical species and their effects on microorganisms using a pulsed high voltage discharge in water , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[25]  R. Scaduto,et al.  Oxidation of DMSO and methanesulfinic acid by the hydroxyl radical. , 1995, Free radical biology & medicine.

[26]  K. Goto,et al.  Spectrophotometric determination of iron(II) with 1,10-phenanthroline in the presence of large amounts of iron(III). , 1974, Talanta.

[27]  J. Bolton,et al.  Kinetics and Mechanism of the Degradation and Mineralization of Acetone in Dilute Aqueous Solution Sensitized by the UV Photolysis of Hydrogen Peroxide , 1996 .

[28]  A. Henglein,et al.  Pulse radiolytic investigations of peroxy radicals produced from 2-propanol and methanol. [12 MeV electron pulses of 100-ns duration] , 1976 .

[29]  Bing Sun,et al.  Use of a pulsed high-voltage discharge for removal of organic compounds in aqueous solution , 1999 .