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Ultrasonic Spray Preparation of TiO2-based Porous Microspheres and Their Photocatalytic Properties

Author: LiuHong
Tutor: ZhangZuoTong
School: Northeast Normal University
Course: Materials Physics and Chemistry
Keywords: TiO2 Porous microsphere material Doping Composite Preparation
CLC: TQ134.11
Type: Master's thesis
Year: 2013
Downloads: 52
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Abstract


TiO2materials have excellent properties in structural,optical and chemical properties.Recently, TiO2materials have been a hot research topic in photocatalytic materials. The porousTiO2microspheres with sub-micron size has been widely applied in the field of photochemicalsolar energy conversion and the use of solar energy. The size of TiO2porous microspheres isnear ultraviolet and visible wavelength. Thus, the microspheres may display interesting lighttrapping via multiple scattering at air-solid interface and the absorption of sunlight can beimproved. Ultrasonic spray pyrolysis method is a low cost and simple process. We preparedTiO2-based porous microspheres by this method and investigated how to enhance thephotocatalytic activity of TiO2by Nb doping and WO3compositing. In addition, TiO2porousmicrospheres were applied in self-cleaning cement. The contents of the paper are listed asfollow:1. Ultrasonic spray pyrolysis method combined impregnation method was used to prepareTiO2, Nb doped TiO2and WO3composite Nb doped TiO2microspheres with an averagediameter of500nm. The as-prepared microspheres had a mesoporous structure and the meanpore diameter was around8-10nm. UV-vis spectra results showed that Nb doped TiO2spheresshowed extended visible light absorption and the spectrum onset had about88nm red shiftcompared with pristine TiO2microspheres. However, WO3composite Nb doped TiO2microspheres do not display a red-shifted absorption edge compared with Nb doped TiO2microspheres. Nb doped TiO2and WO3composite Nb doped TiO2microspheres showed higherphotocatalytic activity for methylene blue degradation compared with that of pristine TiO2microspheres under both visible and solar light irradiation, which could be ascribed to theextended light absorption range and the suppression of electron-hole pair recombination.Moreover, the present microspheres catalysts were advantageous in terms of their ease ofseparation from the aqueous phase, and hence they had good potential in photocatalytic reactorsdesigned on the concept of rational use of sunlight.2. TiO2porous microspheres were applied in self-cleaning cement, which were preparedby ultrasonic spray pyrolysis method. Two model self-cleaning test methods, i.e. change ofwater contact angle after applying oleic acid to the film surface and change of the spectralabsorption of Resazurin dye, were used to characterize photocatalytic self-cleaning property ofcement films, cement films with TiO2nanoparticles, and cement films with TiO2porousmicropheres. Under UV light irradiation, cements film did not show any photocatalytic activity, TiO2microspheres-cement film showed higher photocatalytic activity compared with TiO2particles-cement film, which could be ascribed to the enhancing of the sunlight utilization andthe increasing of the amount of TiO2participated in the reaction in cement internal and surfaceby the introducing of TiO2porous microspheres.

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CLC: > Industrial Technology > Chemical Industry > Inorganic compounds, the chemical industry of the metal elements > Section IV metals elements inorganic compounds > Inorganic compounds of the element titanium vice family ( IV B family) > Inorganic compounds of titanium
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