tailieunhanh - Effect of functionalization conditions on loadings of 3-(trimethoxysilyl)-1-propanolthiol in hexagonal mesoporous SBA-15

Thiol-functionalized SBA-15 silicas have been directly synthesized by cocondensation of tetraethyl orthosilicate (TEOS) and 3-(trimethoxysilyl)-1-propanolthiol (TSPT) under hydrothermal condition. Mesoporous structure was obtained after the surfactant removal by Soxhlet and reflux ethanol extraction. These materials were characterized by means of powder X-ray diffraction, isotherms of nitrogen adsorption/desorption, thermal analysis, infrared spectroscopy and energy-dispersive X-ray spectroscopy. | JOURNAL OF SCIENCE, Hue University, Vol. 69, No. 6, 2011 EFFECT OF FUNCTIONALIZATION CONDITIONS ON LOADINGS OF 3-(TRIMETHOXYSILYL)-1-PROPANOLTHIOL IN HEXAGONAL MESOPOROUS SBA-15 Hoang Van Duc1, Nguyen Thi Anh Thu1, Pham Duy Thinh2 and Dinh Quang Khieu3 1 2 College of Education, Hue University To Van On High School, Khanh Hoa province 3 College of Sciences, Hue University Abstract. Thiol-functionalized SBA-15 silicas have been directly synthesized by cocondensation of tetraethyl orthosilicate (TEOS) and 3-(trimethoxysilyl)-1-propanolthiol (TSPT) under hydrothermal condition. Mesoporous structure was obtained after the surfactant removal by Soxhlet and reflux ethanol extraction. These materials were characterized by means of powder X-ray diffraction, isotherms of nitrogen adsorption/desorption, thermal analysis, infrared spectroscopy and energy-dispersive X-ray spectroscopy. The initial molar ratio of TEOS to TSPT, the time of adding TSPT to synthesize gel and the Soxhlet and reflux ethanol extraction to obtain thiol-functionalized SBA-15 silicas with high thiol content and highly ordered hexagonal mesostructure were discussed. 1 Introduction Ordered nanoporous organosilicas constitute a very exciting field in materials chemistry and have numerous potential applications due to their high surface areas, large pore volumes of ordered mesopores and narrow pore size distributions as well as the possibility of easy functionalization [1]. Among them, the SBA-15 materials have become one of the most popular ordered silica nanomaterials due to large mesopores (up to 15 nm), thicker pore walls, presence of irregular interconnecting micropores and higher thermal and hydrothermal stabilities caused by their thicker mesopore walls [2]. SBA-15 materials are synthesized by hydrolysis and condensation of silica precursor under strong acidic conditions by employing the amphiphilic triblock copolymer (usually Pluronic P123) followed by removal of polymeric template by

• Hoá học
• Functionalization conditions
• Hexagonal mesoporous SBA 15
• Thiol functionalized SBA 15 silicas
• X ray diffraction
• Energy dispersive X ray spectroscopy