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기능성 Zeolite-KCIO3 복합체에 의한 Chlorothalonil의 분해
최충렬 ( Choong Lyeal Choi ),박만 ( Man Park ),이동훈 ( Dong Hoon Lee ),이병묵 ( Byung Mook Lee ),이인구 ( In Koo Rhee ),최정 ( Jyung Choi ),김장억 ( Jang Eok Kim ) 한국환경농학회 2004 한국환경농학회지 Vol.23 No.2
Salt occlusion in zeolite is a unique phenomenon that takes place only when the salt size is similar to the window size of host zeolite. KClO₃-occluded zeolite, as an environment-friendly oxidant, has a high potential for effective removal of various organic pollutants. This study was carried to investigate the characteristics and the removal kinetics of fungicide chlorothalonil by zeolite-KClO₃ complex. About 10% of KClO₃ was occluded in zeolite pores synthesized by salt-thermal method from fly ash, although the occlusion amount was relatively less compared to that of nitrate salts. By occlusion with KClO₃, no remarkable changes were found in X-ray diffraction patterns of cancrinite, whereas some decrease of overall peak intensities was found with those of sodalite. Different releasing kinetics of ClO^(-)₃ ion were observed in distilled water and soil solution from zeolite-KClO₃ complex. Two reactions, hydration and diffusion, seem to be related with the release of KClO₃. Therefore, the release isotherm of ClO^(-)₃ ion well fitted to the power function model which indicate the release was made by hydration and diffusion. The removal of chlorothalonil by zeolite and KClO₃ reached at reaction equilibrium within 6 hours by 18% and 47%, respectively. However, the chlorothalonil removal by the zeolite-KClO₃ complex increased slowly and steadily up to 92% in 96 hours. These findings suggested that zeolite-KClO₃ complex could be applied for effective removal of organic contaminants in the soil and aqueous environment.
FA-Zeolite A 및 X에 의한 수용액 중 양이온성 제초제의 흡착
최충렬 ( Choong Lyeal Choi ),여상운 ( Sang Woon Yeo ),김장억 ( Jang Eok Kim ),박만 ( Man Park ) 한국환경농학회 2009 한국환경농학회지 Vol.28 No.4
The purpose of this study is to elucidate the adsorption properties of fly ash (FA)-derived zeolites A and X for the divalent cationic herbicides, paraquat and diquat. Their adsorption isotherms were well fitted to the Langmuir equation, indicating that adsorption mainly occurred on the crystal surface. FA-zeolite X showed a higher adsorption capacity than that of FA-zeolite A due to wide pore window size in spite of its low CEC. The equilibrium adsorption increased with increasing the reaction temperature because of the enhanced molecule activity and the thermal expansion of zeolite pore windows. Overall, these results demonstrated that the FA-zeolite synthesized from fly ash could be used as a low-cost mineral adsorbent for the removal of environmental cationic organic pollutants from the aqueous solution.
Zerovalent iron-montmorillonite 복합체에 의한 chlorothalonil의 분해
최충렬 ( Choong Lyeal Choi ),박만 ( Man Park ),이동훈 ( Dong Hoon Lee ),이인구 ( In Koo Rhee ),송경식 ( Kyung Sik Song ),강상재 ( Sang Jae Kang ),김장억 ( Jang Eok Kim ) 한국환경농학회 2006 한국환경농학회지 Vol.25 No.3
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.