The effect of microstructure on the photocatalytic properties of TiO2

Khameneh Asl, S ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.4028/www.scientific.net/AMR.264-265.1340
  3. Publisher: 2011
  4. Abstract:
  5. Titanium dioxide is a cheap, chemically stable and non-toxic material. However its photocatalytic properties are unstable and it is a modest semiconductor and a mediocre insulator. For several applications it would be interesting to make it either more insulating or more conducting. The goal of this work was to modify the photocatalytic properties of nano-crystalline TiO2 powders by wet chemical routes and hydrothermal methods to understand the mechanism leading to these modifications The principal factors that influence the photocatalytic properties are on the one hand the concentration and nature of the chemical and physical conditions in TiO2, and on the other hand the morphology of the powders. The study was split into two parts. The fist part describes the modifications of the material obtained by chemical preparation's parameters. Like: preparation method, pH., additives, surfactants, and temperature. The second part describes the modifications obtained by modifying the photo catalysis reactors. Several analysis techniques have been used to characterize the TiO2 samples. They are essentially divided in four categories. The chemical analyses included electron probe microanalyses. The structure and morphology analyses of powders were carried out with x-ray diffraction. The photo catalytically properties in batch or CRS mode were measured in room temperature. Finally optical transmission provided information on the electronic states and morphology of the samples. The results imply that powders with anatase 40% and rutile 60 % with 15nm crystallite size have the optimum properties
  6. Keywords:
  7. Photo catalytic ; TiO2 ; Analysis techniques ; Chemical preparation ; Electron probe microanalyses ; Hydrothermal ; Hydrothermal methods ; Nanocrystallines ; Non-toxic materials ; Optimum properties ; Photo-catalytic ; Photocatalytic property ; Physical conditions ; Preparation method ; Principal factors ; Room temperature ; Structure and morphology ; TiO2 ; TiO2 powders ; Wet chemical route ; Chemical modification ; Crystallite size ; Light transmission ; Microstructure ; Morphology ; Oxide minerals ; Powders ; Surface active agents ; Titanium ; Titanium dioxide ; Toxic materials ; X ray diffraction ; X ray powder diffraction ; Chemical analysis
  8. Source: Advanced Materials Research, 26 October 2009 through 29 October 2009 ; Volume 264-265 , 2011 , Pages 1340-1345 ; 10226680 (ISSN) ; 9783037850534 (ISBN)
  9. URL: http://www.scientific.net/AMR.264-265.1340