Multistep impregnation method for incorporation of high amount of titania into SBA-15 |
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| Affiliation: | 1. Institute of Fluid Mechanics, Chair of Magnetofluiddynamics, Technische Universitaet Dresden, Dresden 01069, Germany;2. ENT-Department, Section for Experimental Oncology and Nanomedicine (Else Kröner-Fresenius-Stiftungsprofessur), University Hospital Erlangen, Waldstraße 1, Erlangen 91054, Germany;3. Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, Berlin 10587, Germany;1. School of Physics, Peking University, Beijing 100871, People?s Republic of China;2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People?s Republic of China;1. Department of Physics and Electronics, Beijing University of Chemical Technology, Beijing 100029, China;2. Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China;3. Institute of Plastics Machinery and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;4. School of Software Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;5. Faculty of Sciences, Department of Physics, Laboratory L.P.S., Badji Mokhtar-Annaba University, Annaba 23000, Algeria;1. Department of Physics, Bose Institute, 93/1, Acharya Prafulla Chandra Road, Kolkata 700009, India;2. UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8, Salt Lake, Kolkata 700098, India;1. CSIRO Materials Science and Engineering, Lindfield, NSW 2070, Australia;2. Laboratory for Microstructures, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;1. School of Physics & Electronic Engineering, Mianyang Normal University, Mianyang 621000, PR China;2. Department of Material Science, Sichuan University, Chengdu 610064, PR China;3. Research Center of Laser Fusion, CAEP, Mianyang 621900, PR China |
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| Abstract: | A multistep impregnation method was employed to incorporate high amount of titania into the mesoporous SBA-15 silica. No damage to the SBA-15 silica mesostructures was caused by the loading of titania in every cycle. The existence of titania small nanodomains were confirmed to be present by Raman spectra and UV–vis DRS measurements. High dispersion of them was realized via this method according to the results of low-angle X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and N2 sorption measurements. Importantly, no blockage of mesostructures was acknowledged with titania content up to 24.4 wt.%. In comparison, normally used one-step impregnation method led to serious blockage of mesopores as the results of formation of bulk titania particles in the mesochannels. Photo-activity test for the removal of oestrogen showed the superiority of the materials synthesized by multistep impregnation method to one-step impregnation method. |
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