Effects of surface properties and textures of imprinted silica on recognition of bisphenol A

Shu Kang Hsu*, Su-Min Chang

*此作品的通信作者

研究成果: Conference contribution同行評審

摘要

In this study, we have successfully prepared organically modified silica imprinted with bisphenol A though an acidic catalyzed sol-gel method. To understand the effects of surface interactions and diffusion on the recognition ability of the imprinted gels toward bisphenol A, the adsorption capacity and selectivity with respect to the surface functional groups, iso-electric points, pore sizes and porosity of the silica were investigated. We used phenyltrimethoxysilane (PTMOS) and 3-aminopropyl trirthoxysilane(APTES) as functional monomers and tetraethoxysilane (TEOS) and methyltrimehoxysilane (MTMOS) as cross linkers in the sol-gel process. Relative to the hydroxyl and amine groups, phenyl groups exhibited stronger □-stacking interaction with bisphenol A and higher improvement on the adsorption capacity of the imprinted silica. However, they resulted in lower recognition ability of the imprinted gels for similar aromatic compounds. The porosity, average pore sizes as well as the adsorption capacity of the gels increased in the presence of MTMOS. Since the structures of silica gels are rigid, methyl groups expanded the pore channels thus facilitated the diffusion of target compounds the inorganic matrix to the imprinted sites. The optimal gels performed a linear adsorption of 0.03-4.36 mg/g when initial concentrations of bisphenol A were 4-400 ppm. The saturated capacity was 151.5 mg/g. This value was 4.4 times higher than the maximal capacity of non-imprinted silica (34.7mg/g). In addition, the selectivity of bisphenol A was 5.3 time higher relative to phenol. These results indicate that the imprinted silica is highly promising to be used as the advanced sensing materials for detection of bisphenol A.

原文English
主出版物標題American Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
出版狀態Published - 2009
事件238th National Meeting and Exposition of the American Chemical Society, ACS 2009 - Washington, DC, United States
持續時間: 16 8月 200920 8月 2009

出版系列

名字ACS National Meeting Book of Abstracts
ISSN(列印)0065-7727

Conference

Conference238th National Meeting and Exposition of the American Chemical Society, ACS 2009
國家/地區United States
城市Washington, DC
期間16/08/0920/08/09

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