Synthesis and characterization of TiO2-coated SiO2 particles by hydrolysis of titanium alkoxide in alcohol solvents

Abstract

TiO 2 -coated SiO 2 particles were prepared using industrially-wasted amorphous SiO 2 particles by an alkoxide method. The amorphous SiO 2 particles were used as support for TiO 2 photocatalyst. The mean size of the amorphous SiO 2 particle was approximately 100 nm. The major synthesis parameters were a kind of alcohol solvent (methanol, ethanol, and 1-propanol) and calcination temperature. The SiO 2 particles and titanium tetraisopropoxide were mixed in an alcohol solvent and an appropriate amount of distilled water was added to the suspension for hydrolysis of the alkoxide. The precipitate was calcined in the temperature range from 600 to 1300°C to crystallize the deposited TiO 2 . The samples were characterized using XRD, BET and TEM-EDS analyzer. It was found that the use of SiO 2 support, methanol solvent in hydrolysis of Ti alkoxide and freeze-drying of product were effective to keep the anatase phase at high calcination temperature even though the crystallite size of anatase increased and the specific surface area decreased. As a result, the maximum decomposition ratio of methylene blue was obtained on the TiO 2 -coated SiO 2 particles synthesized in methanol solution and calcined at 1000°C.

Preparation and Characterization of TiO₂ Support for Pd Catalysts: Application in Hydrogenation of 4-Carboxybenzaldehyde

“…It means that SiO 2 particles effectively inhibit the growth of TiO 2 grain and the phase transformation from anatase to rutile. The conclusion of antisintering effect of SiO 2 on TiO 2 is also seen in these papers [26][27][28]. Effect of forming pressures.…”

Sand Supported Mixed‐Phase TiO2 Photocatalysts for Water Decontamination Applications

“…Various catalyst support materials of increased surface area have been utilized to enhance the available surface area of immobilized TiO 2 photocatalysts for water purification applications. These support materials include glass fibers, [13,14] porous silica, [15] silica gel, [16] amorphous silica nano-particles, [17] carbon particles, [18,19] and zeolites. [20] Sands are attractive as enhanced-surface-area catalyst support materials for large-scale water purification as a result of their low costs and the ease with which they can be separated from water.…”

“…These support materials include glass fibres [13,14] , porous silica [15] , silica gel [16] , amorphous silica nanoparticles [17] , carbon particles [18,19] , and zeolites [20] .…”

“…Various catalyst support materials of increased surface area have been utilised to enhance the available surface area of immobilised TiO 2 photocatalysts for water purification applications. These support materials include glass fibres [13,14] , porous silica [15] , silica gel [16] , amorphous silica nanoparticles [17] , carbon particles [18,19] , and zeolites [20] .…”