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Degradation of Chlorothalonil by Zerovalent Iron-Montmorillonite Complex

Zerovalent iron-montmorillonite 복합체에 의한 chlorothalonil의 분해

  • Choi, Choong-Lyeal (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Park, Man (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Lee, Dong-Hoon (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Rhee, In-Koo (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Song, Kyung-Sik (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Kang, Sang-Jae (Department of Environmental Horticulture, Sangju National University) ;
  • Kim, Jang-Eok (Department of Agricultural Chemistry, Kyungpook National University)
  • Published : 2006.09.30

Abstract

Zerovalent iron (ZVI) has been recently used for environmental remediation of soils and groundwaters contaminated by chlorinated organic compounds. As a new approach to improve its reductive activity and stability, zerovalent iron-montmorillonites (ZVI-Mt) complex are synthesized by simple process. Therefore, this study was carried out to elucidate the characteristics of ZVI-Mt complex and to investigate degradation effects of fungicide chlorothalonil. The XRD patterns of ZVI-Mt complex showed distinctive peaks of ZVI and montmorillonite. In ZVI-Mt complex, the oval particles of ZVI were partly surrounded by montmorillonite layers that could prevent ZVI surface oxidation by air. The degradation ratio of chlorothalonil after 60 min exhibited 71% by ZVI and 100% by ZVI-Mt complex. ZVI-Mt21 complex exhibited much higher and faster degradation ratio of chlorothalonil compare to that of ZVI or ZVI-Mt11 complex. Also, degradation rate of chlorothalonil was increased with increasing ZVI or ZVI-Mt complex content and with decreasing initial solution pH.

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