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Received November 23, 2005
Accepted January 24, 2006
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계면활성제가 담지된 메조포러스 실리케이트에 의한 수중 납이온 제거
Removal of Pb2+ Ions from Water by Surfactant-templated Mesoporous Silicates
울산대학교 생명화학공학부, 680-749 울산시 남구 무거2동 산 29
School of Chemical Engineering and Bioengineering, University of Ulsan, San 29, Mugeo 2-dong, Nam-gu, Ulsan 680-749, Korea
ewshin@mail.ulsan.ac.kr
Korean Chemical Engineering Research, April 2006, 44(2), 172-178(7), NONE Epub 10 May 2006
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Abstract
메조포러스 실리케이트 물질은 포어 내에 thiol(?SH)기나 amine(?NH2)기 등의 관능기를 도입하여 수중의 중금속이온을 제거하는 흡착제로 많이 활용되어왔다. 본 연구는 메조포러스 실리케이트 합성에서 구조형성 전구체로 사용되는계면활성제가 중금속 이온의 흡착활성점으로도 작용하는지를 조사하고자 하였다. 서로 다른 계면활성제를 사용하는 세가지 메조포러스 실리케이트(SBA-15, MCM-41, HMS)을 합성하여 소성 전 계면활성제가 담지되어 있는 경우와 소성되어 계면활성제가 사라진 경우에 이들의 수중 납이온의 흡착거동을 살펴보았다. 먼저, X선 회절분석 실험과 질소 기체 흡착 거동으로 메조포러스 실리케이트의 메조포어 구조를 확인하였고, FT-IR 분석을 통해 소성 전의 계면활성제의존재와 소성 후에 계면활성제의 제거를 확인하였다. 중금속인 납이온을 사용하여 이들의 흡착능을 측정한 결과, 모든소성된 메조포러스 실리케이트 물질과 공중합 고분자를 계면활성제로 이용하는 SBA-15는 수중에서 납이온에 대한 흡착능이 극히 미비한 반면에 각각 dodecylamine과 hexadecyltrimethylammoniumbromide(HDTMA)를 계면활성제로 사용하는 HMS, MCM-41은 소정의 흡착능을 보여주었다. 초기 납이온 농도가 50ppm, 용액 pH가 5인 흡착 조건에서 얻은 흡착 키네틱 데이터를 pseudo second order kinetic model에 적용하여 계산한 결과, 계면활성제가 담지된 HMS는115.16mg/g, 계면활성제가 담지된 MCM-41은 26.60 mg/g의 납이온 흡착능을 나타내었다. 이러한 흡착능은 기존의 다른 메조포러스 실리케이트 흡착제의 흡착능과 유사하며, 그들과 비교하여 계면활성제가 담지된 흡착제는 전처리나 후처리 없이 흡착제로 활용할 수 있는 장점을 가지고 있다.
Mesoporous silicate materials have been used as adsorbents for the removal of heavy metals from water byintroducing functional groups such as thiol and amine. In this research, it was investigated whether surfactants used astemplating agents in synthetic processes can act as adsorption sites for heavy metals. Three mesoporous silicates-SBA-15, MCM-41, and HMS were synthesized using, respectively, block copolymer, hexadecyltrimethylammoniumbromide(HDTMA), and dodecyamine as surfactants. X-ray diffraction and N2 gas adsorption analysis confirmed that the meso-porous silicates were well prepared and FT-IR spectra resulted in the existence of the surfactants in as-synthesized meso-porous silicates and the removal of surfactants after calcination. The interactions between Pb2+ ions and the mesoporoussilicate materials with/without surfactants were observed. In adsorption kinetic experiments, it revealed that the calcinedmesoporous silicates and the surfactant-loaded SBA-15 almost had no adsorption capacity for Pb2+ ions. In contrast, thesurfactant-loaded MCM-41 and HMS showed, respectively, the adsorption capacities of 26.60 and 115.16 mg/g whichwere acquired through the fits of adsorption kinetic data to the pseudo second order kinetic model. The adsorptioncapacities were comparable to those of other mesoporous adsorbents for heavy metals.
Keywords
References
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Pitcher SK, Slade RCT, Ward NI, Sci. Total Environ., 334(17), 161 (2004)
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Algarra M, Jimenez V, Rodriquez-Castellon E, Jimenez-Lopez A, Jimenez-Jimenez J, Chemosphere, 59(4), 779 (2005)
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Feng X, Fryxell GE, Wang LQ, Kim AY, Liu J, Kemner KM, Science, 276(5314), 923 (1997)
Zhao H, Nagy KL, Waples JS, Vance J, Environ. Sci. Technol., 34(25), 4822 (2000)
Mercier L, Pinnavaia TJ, Environ. Sci. Technol., 32(14), 2749 (1998)
Jeon C, Park JY, Yoo YJ, Water Res., 36(17), 1814 (2002)
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Jang M, Park JK, Shin EW, Microporous Mesoporous Mater., 75(20), 159 (2004)
Sayari A, Hamoudi S, Yang Y, Chem. Mater., 17(34), 212 (2005)
