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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.40, No.2, 265-273, 2002
천연 및 합성 제올라이트의 Triadimefon 흡ㆍ탈착 특성
Adsorption and Desorption of Triadimefon by Natural and Synthetic Zeolites
감상규, 김길성, 안병준, 이민규
제올라이트의 농약 흡ㆍ탈착 특성을 살펴보기 위해 천연제올라이트(CLIN), 석탄재로부터 합성된 Faujasite 제올라이트(FAUF), 스코리아와 석탄재를 6:4의 비율로 하여 합성한 FAU와 Na-P1이 혼합된 제올라이트[(FAU+Na-P1)SF], 폐 유동층 촉매 분해반응촉매(FCCW) 등을 이용하여 골프장에 살포되고 있는 triazole류 살균제인 tridaimefon에 대해 각 제올라이트와 triadimefon 상호간의 흡ㆍ탈착, triadimefon 흡착에 미치는 용액의 pH, 온도 영향 등에 대하여 검토하였다. 제올라이트 종류에 따른 triadimefon의 분배계수 KD 및 Freundlich 흡착상수인 KF는 FCCW>FAUF>(FAU+Na-P1)SF>CLIN의 순으로 감소하였다. 천연 제올라이트인 CLIN에 흡착된 triadimefon은 4회 연속적인 탈착실험 동안 쉽게 탈착이 일어나 탈착등온선이 흡착등온선에 접근하였으나, 합성 제올라이트의 경우 탈착되는 triadimefon의 양이 매우 적어 흡착등온선과 크게 벗어나는 이력현상을 보였다. 또한 이력현상은 농약의 농도가 감소할수록, 그리고 triadimefon에 대한 흡착능이 큰 제올라이트일수록 증가하였다.
Adsorption-desorption characteristics of triadimefon(pesticide) by natural zeolite(CLIN) and several synthetic zeolites was investigated. The synthetic zeolites used in this study were as follows : Faujasite(FAUS) synthesized from coal fly ash; the mixture of FAU and Na-P1 synthesized from the ratio of Jeju scoria 6 to coal fly ash 4 by weight (FAU+Na-P1)SF; waste fluid catalytic cracking catalyst(FCCW). The distribution coefficient, KD and Freundlich constant, KF decreased in the following sequences: FCCW>FAUF>(FAU+Na-P1)SF>CLIN among the zeolites. The desorption characteristics of triadimefon adsorbed on zeolites was greatly different among natural and synthetic zeolites, i.e., the desorption of triadimefon occurred easily during four successive desorption cycles for natural zeolite CLIN, however, for synthetic zeolites, it leaded to poorly defined desorption isotherms with very small triadimefon concentrations desorbed, greatly deviated from the adsorption isotherms, indicating the severe hysterisis. The hysterisis was more evident in more adsorptive zeolites and at lower triadimefon concentrations.
Keywords: Adsorption; Desorption; Triadimefon; Zeolite; Pesticide; Hysterisis
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