Immobilization of titanium dioxide in mesoporous silicas: Structural design and characterization

Heterostructural transformation of mesoporous silica–titania hybrids

“…Prior to the measurement, the samples were dehydrated at 120 °C under vacuum for 2 h. The surface area was calculated by the Brunauer–Emmett–Teller (BET) method using a linear plot in the range of P/P 0 = 0.05–0.20 63 . Pore size distributions were derived from the N 2 adsorption isotherm by BJH method 31 . The diffuse reflectance spectra were obtained by using UV spectrometer (Perkin Elmer Lambda 1050 UV/Vis/NIR Spectrophotometer) with an integrate sphere.…”

“…The properties of TiO 2 supported in/on porous materials depend on their crystallinity 21 and the surface properties [22][23][24][25] . Such porous solids as a porous carbon 26 , a metal organic framework 27 , zeolites 28 , clay minerals 29 and mesoporous silicas 30,31 have been used to accommodate TiO 2 particles with varied composition. Among available porous supports, mesoporous silicas have been used extensively for the application as drug carrier, adsorbent and catalysts/photocatalysts due to the attractive characteristic features of mesoporous silicas such as thermal and chemical stability, transparency in the visible to UV-Vis wavelength regions, and well-defined pore shape and size, which influence the heterostructures of the hybrids 31 .…”

“…Such porous solids as a porous carbon 26 , a metal organic framework 27 , zeolites 28 , clay minerals 29 and mesoporous silicas 30 , 31 have been used to accommodate TiO 2 particles with varied composition. Among available porous supports, mesoporous silicas have been used extensively for the application as drug carrier, adsorbent and catalysts/photocatalysts due to the attractive characteristic features of mesoporous silicas such as thermal and chemical stability, transparency in the visible to UV–Vis wavelength regions, and well-defined pore shape and size, which influence the heterostructures of the hybrids 31 . The heterostructure of the titania hybridized with mesoporous silicas is used for the photodecomposition of organic pollutants through the possible interactions of the organic pollutants with the pore surface 32 .…”

Crystallization of well-defined anatase nanoparticles in SBA-15 for the photocatalytic decomposition of acetic acid

“…4,5 The shape and size of the particles as well as their location in MPSs are key factors, so that the TiO 2 species have been immobilized in MPSs in such different states as isolated molecular species and oxide nanoparticles in the silica wall and on the mesopores. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Though the size-controlled synthesis of TiO 2 particles has been a topic of interest in materials chemistry to adapt the wide range of applications of TiO 2 and to optimize the materials' performances, size-controlled synthesis of TiO 2 using MPSs as templates is still challenging.…”

“…There are many papers on the preparation of anatase in MPSs and the uses as photocatalysts, while the sizes and the locations of the anatase particles in the pores/on the external surface of the MPS particles are not precisely control resulting the broad particle size distribution of the anatase particles. 7 The optimization of the crystallization temperature of anatase in MPS have been reported where the size of the anatase particle and the porosity of the hybrids changed by increasing the crystallization temperature, which were probably due to the growth of the anatase particles located on the external surface of the MPS particles during the heat treatment. [18][19][20][21] The changes in the size of the anatase and the porosity of the hybrids makes the comparative evaluation of the photocatalysts' performances difficult.…”