Synthesis, Bifunctionalization, and Remarkable Adsorption Performance of Benzene-Bridged Periodic Mesoporous Organosilicas Functionalized with High Loadings of Carboxylic Acids

Autor:	Fa Kuen Shieh, Kevin C.-W. Wu, Yi Wen Chen, Hsien Ming Kao, Hao Yiang Wu, Juti Rani Deka, Shih Hsiang Liao
Rok vydání:	2013
Předmět:	Magnetic Resonance Spectroscopy Carboxylic acid Inorganic chemistry Carboxylic Acids Catalysis chemistry.chemical_compound Drug Delivery Systems Adsorption X-Ray Diffraction Pulmonary surfactant Desorption Benzene Derivatives Organosilicon Compounds Benzene chemistry.chemical_classification Organic Chemistry General Chemistry Nuclear magnetic resonance spectroscopy Methylene Blue Mesoporous organosilica Models Chemical chemistry Doxorubicin Porosity Methylene blue Nuclear chemistry
Zdroj:	Chemistry - A European Journal. 19:6358-6367
ISSN:	0947-6539
DOI:	10.1002/chem.201204400
Popis:	Highly ordered benzene-bridged periodic mesoporous organosilicas (PMOs) that were functionalized with exceptionally high loadings of carboxylic acid groups (COOH), up to 80 mol % based on silica, have been synthesized and their use as adsorbents for the adsorption of methylene blue (MB), a basic dye pollutant, and for the loading and release of doxorubicin (DOX), an anticancer drug, is demonstrated. These COOH-functionalized benzene-silicas were synthesized by the co-condensation of 1,4-bis(triethoxysilyl) benzene (BTEB) and carboxyethylsilanetriol sodium salt (CES), an organosilane that contained a carboxylic acid group, in the presence of non-ionic oligomeric surfactant Brij 76 in acidic medium. The materials thus obtained were characterized by a variety of techniques, including powder X-ray diffraction (XRD), nitrogen-adsorption/desorption isotherms, TEM, and (13)C and (29)Si solid-state NMR spectroscopy. Owing to the exceptionally high loadings of COOH groups, their high surface areas, and possible π-π-stacking interactions, these adsorbents have very high adsorption capacities and extremely rapid adsorption rates for MB removal and for the controlled loading/release of DOX, thus manifesting their great potential for environmental and biomedical applications.
Databáze:	OpenAIRE
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