Preparation and photo-catalytic activity of TiO2-coated medical stone-based porous ceramics
Gao Ru-qin, Hou Xin-mei. Preparation and photo-catalytic activity of TiO2-coated medical stone-based porous ceramics, Int. J. Miner. Metall. Mater., 20 (2013), No. 6, p. 593-597.
porous materials; ceramics; medical stone; titanium dioxide; thin films; formaldehyde; photocatalysis
Medical stone-based porous ceramics as a carrier were prepared by ultra-fine grinding and low-temperature sintering method. Nano-TiO2 thin films were loaded on the carrier by chemical liquid deposition method using titanium tetrachloride as a precursor. The micro-morphology and microstructure of the synthesized samples were characterized using X-ray diffraction, scanning electron microscopy with energy dispersive spectrometry, and mercury injection method. The photo-catalytic activity of the TiO2 thin films was investigated by degrading formaldehyde. The main crystalline phase in the TiO2 thin films calcined at 550℃ is anatase with the average particle size about 10 nm. The specific surface area of the carrier-coated nano-TiO2 increases from 3.68 to 5.32 m2/g. The formaldehyde removal rate of the TiO2/medical stone-based porous ceramics irradiated under an ultraviolet lamp for 120 min reaches 85.6%.