Size-Controlled Synthesis of Anatase in a Mesoporous Silica, SBA-15

Langmuir : the ACS Journal of Surfaces and Colloids
Kasimanat VibulyaseakMakoto Ogawa

Abstract

The preparation of anatase in the cylindrical mesopore of SBA-15 (pore size of 8 nm) was done by the impregnation of tetraisopropyl orthotitanate and its subsequent crystallization. The impregnation was done without a solvent. Hydrolysis and condensation were promoted by the HCl vapor to encapsulate a larger amount of titanium oxo species in the mesopore and to suppress the desorption of the titanium oxo species during crystallization to anatase. After the reaction, the shape of the N2 adsorption isotherm changed significantly, indicating the decrease of the Brunauer-Emmett-Teller surface area from 743 to 283 m2/g and of the pore volume from 1.27 to 0.26 cm3/g, respectively. After the crystallization to anatase, the TiO2 content in the product was estimated to be 62 mass %, filling 30% of the pore volume of SBA-15. The homogeneous distribution of titanium in the SBA-15 sample was confirmed by elemental mapping based on scanning electron microscopy/energy-dispersive X-ray spectrometry. The crystal size of the anatase was determined to be ca. 8.1 nm, which is consistent with the pore size of the used SBA-15 (8.0 nm, derived from the Barrett-Joyner-Halenda analysis of the nitrogen adsorption isotherm). The zeta potential measureme...Continue Reading

References

Nov 20, 2003·Journal of the American Chemical Society·P Davide CozzoliHorst Weller
Oct 7, 2005·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ruirong GuoDezhong Shen

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Citations

Jul 2, 2019·Chemical Communications : Chem Comm·Kasimanat Guy VibulyaseakMakoto Ogawa
Jul 12, 2019·Beilstein Journal of Nanotechnology·Eduardo Ruiz-HitzkyMakoto Ogawa
Oct 11, 2020·Environmental Science and Pollution Research International·Laíse M CarvalhoGeraldo E Luz
Feb 7, 2021·Scientific Reports·Navarut PaengjunMakoto Ogawa
Jun 4, 2020·Inorganic Chemistry·Kasimanat VibulyaseakMakoto Ogawa

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