Spray-dried mesoporous silica spheres functionalized with carboxylic groups

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• 作者：S. Fiorilli ; F. Tallia ; L. Pontiroli ; C. Vitale-Brovarone ; B. Onida
• 关键词：Mesoporous silica ; Fuctionalization ; Spray drying ; Spheres ; Carboxylic
• 刊名：Materials Letters
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：108
• 期：Complete
• 页码：118-121
• 全文大小：439 K

文摘

Spherical mesoporous particles functionalized with carboxylic groups were prepared through a co-condensation route by spraying a solution containing hydrolyzed alkoxide (tetraethoxysilane) and an organosilane (4-(triethoxysilyl) butyronitrile)), in the presence of nonionic block copolymer as template. Samples have been then treated with sulfuric acid to remove the template and to hydrolyze simultaneously the -CN to -COOH groups. The mesoporous spheres show high specific surface area and narrow pore size distribution. TG and FT-IR analysis confirm the incorporation of the carboxylic moieties, whose amount results ca 1 meq g^?1 by titration with alkali solution. The mean size of mesoporous spheres can be ranged from few microns to submicron by varying the initial precursor concentration of spray-dried synthesis solution.