DEGRADATION OF BENZOTHIOPHENE BY ULTRASONIC IRRADIATION : INTERMEDIATES
AND PARAMETERS

Kim, ll-Kyu; Cheong, Jang-Pyo

doi:2003.8.2.72

Environmental Engineering Research 2003;8(2): 72-81. DOI: https://doi.org/10.4491/eer.2003.8.2.072

DEGRADATION OF BENZOTHIOPHENE BY ULTRASONIC IRRADIATION : INTERMEDIATES AND PARAMETERS

¹Department of Environmental Engineering, Pukyong National Engineering, Busan 608-737, Korea
²Department of Civil and Environmental Engineering, Kyungsung University, Busan 608-736, Korea

Corresponding Author: ll-Kyu Kim ,Tel: +82-51-620-6432, Fax: +82-51-621-8166, Email: ikkim@pknu.ac.kr

Received: November 6, 2002; Accepted: January 7, 2003.

ABSTRACT

Benzothiophene (BT) is decomposed rapidly following a pseudo-first-order kinetics upon ultrasonic irradiation in aqueous solutions. The rate constant increases with temperature, and pH and decreases with increasing initial benzothiophene concentration. Hydroxybenzothiophenes, dihydroxy-benzothiophenes, and benzothiophene-dione were identified as intermediates. The evolution of carbon dioxide and sulfite was also observed during sonochemical reaction. The intermediate study suggests that the degradation of benzothiophene via Oi l radical addition is one of the most important degradation mechanism.