Dechlorination of the Fungicide Chlorothalonil by Zerovalent Iron and Manganese Oxides

Zerovalent Iron 및 Manganese Oxide에 의한 살균제 Chlorothalonil의 탈염소화

  • Yun, Jong-Kuk (Division of Applied Biology and Chemistry, Kyungpook National University) ;
  • Kim, Tae-Hwa (Division of Applied Biology and Chemistry, Kyungpook National University) ;
  • Kim, Jang-Eok (Division of Applied Biology and Chemistry, Kyungpook National University)
  • 윤종국 (경북대학교 응용생물화학부) ;
  • 김태화 (경북대학교 응용생물화학부) ;
  • 김장억 (경북대학교 응용생물화학부)
  • Published : 2008.03.31

Abstract

This study is conducted to determine the potential of zerovalent iron (ZVI), pyrolusite and birnessite to remediate water contaminated with chlorothalonil. The degradation rate of chlorothalonil by treatment of ZVI, pyrolusite and birnessite was much higher in low condition of pH. Mixing an aqueous solution of chlorothalonil with 1.0% (w/v) ZVI, pyrolusite and birnessite resulted in 4.7, 13.46 and 21.38 hours degradation half-life of chlorothalonil, respectively. Dechlorination number of chlorothalonil by treaonent of ZVI, pyrolusite and birnessite exhibited 2.85, 1.12 and 1.09, respectively. Degradation products of chlorothalonil by teartment of pyrolusite and birnessite were confirmed as trichloro-1,3-dicyanobenzene and dichloro-1,3-dicyanobenzene which were dechlorinated one and two chlorine atoms from parent chlorothalonil by GC-mass. Degradation products of chlorothalonil by ZVI were identified not only as those by pyrolusite and birnessite but as further reduced chloro-1,3-dicyanobenzene and chlorocyanobenzene.

Keywords

Chlorothalonil;zerovalent iron;pyrolusite;birnessite;dechlorination;D/N value;degradation products

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