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http://dx.doi.org/10.5338/KJEA.2004.23.2.111

Degradation of the Chlorothalonil by Functional Zeolite-KCIO3 Complex  

Choi, Choong-Lyeal (Institute of Agricultural Science & Technology, Kyungpook National University)
Park, Man (School of Chemistry and Molecular Engineering, Seoul National University)
Lee, Dong-Hoon (Department of Agricultural Chemistry, Kyungpook National University)
Lee, Byung-Mook (Department of Agricultural Chemistry, Kyungpook National University)
Rhee, In-Koo (Department of Agricultural Chemistry, Kyungpook National University)
Choi, Jyung (Department of Agricultural Chemistry, Kyungpook National University)
Kim, Jang-Eok (Department of Agricultural Chemistry, Kyungpook National University)
Publication Information
Korean Journal of Environmental Agriculture / v.23, no.2, 2004 , pp. 111-116 More about this Journal
Abstract
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. $KCIO_3$-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-$KCIO_3$ complex. About 10% of $KCIO_3$ 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 $KCIO_3$, 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 $CIO_3^-$ ion were observed in distilled water and soil solution from zeolite-$KCIO_3$ complex. Two reactions, hydration and diffusion, seem to be related with the release of $KCIO_3$. Therefore, the release isotherm of $CIO_3^-$ 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 $KCIO_3$ reached at reaction equilibrium within 6 hours by 18% and 47% respectively. However, the chlorothalonil removal by the zeolite-$KCIO_3$ complex increased slowly and steadily up to 92% in 96 hours. These findings suggested that zeolite-$KCIO_3$ complex could be applied for effective removal of organic contaminants in the soil and aqueous environment.
Keywords
salt occlusion, zeolite; fly ash; zeolite-$KCIO_3$ complex; chlorothalonil;
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