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Korean Journal of Chemical Engineering, Vol.20, No.6, 1045-1053, 2003
Reaction Pathways and Kinetic Modeling for Sonochemical Decomposition of Benzothiophene
Benzothiophene (BT) decomposed rapidly following pseudo-first-order kinetics by ultrasonic irradiation in aqueous solution. The rate constant increased with increasing ultrasonic energy intensity. Hydroxybenzothiophenes, dihydroxy-benzothiophenes, and benzothiophene-dione were identified as reaction intermediates. It was proposed that benzothiophene was oxidized by OH radical to sequentially form hydroxybenzothiophenes, dihydroxybenzothiophenes, and benzothiophene-dione. Evolution of carbon dioxide and sulfite was also observed during ultrasonic reaction. Kinetic analysis suggested that approximately 77% of the benzothiophene decomposition occurred via OH radical addition. Pathways and a kinetic model for ultrasonic decomposition of benzothiophene in aqueous solution were proposed.
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