Titania photocatalytic activity

Zhang and Qi synthesized hybrid bacterial cellulose/titania. They obtained mesoporous Titania networks consisting of nanowires, using as a template bacterial cellulose membrane. The network obtained shows Titania photocatalytic activity [46]. Composites of cellulose acetate/silica were obtained by sol-gel method [47]. Tanaka and Kozuka precipitated silica by acid catalysis of tetraethyl orthosilicate (TEOS). The composites of cellulose acetate/silica showed... 

On account of the reported photocatalytic activity of titania nanosheets in the oxidation of water [290], Yamada et al. [291] attempted to fabricate photoelectrodes responsive to visible light by coating Cd8 electrodes with titania nanosheets. It was considered that since the thickness of a nanosheet is as small as two atomic layers of... 

Calza, P., Pelizzetti, E., Mogyorosi, K, Kun, R., and Dekany, I. (2007) Size dependent photocatalytic activity of hydrothermally crystallized titania nanoparticles on poorly adsorbing phenol in absence and presence of fluoride ion. Applied Catalysis B Environmental, 72 (3 1), 314-321. 

Yu, J., Xiang, Q., and Zhou, M. (2009) Preparation, characterization and visible-light-driven photocatalytic activity of Fe-doped titania nanorods and first-principles study for electronic structures. Applied Catalysis B Environmental,... 

Ao, Y., Xu, J., Fu, D., and Yuan, C. (2009) Synthesis of C,N, S-tridoped mesoporous titania with enhanced visible light-induced photocatalytic activity. Microporous and Mesoporous Materials, 122 (1—3), 1-6. 

Li, Y., Ma, M., Wang, X., and Chen, G. (2009) Photocatalytic activity of porous titania nanocrystals prepared by nanoscale permeation process in supercritical C02 effects of supercritical conditions. Catalysis Communications,... 

Kuo, C.S., Tseng, Y.H., Huang, C.H., and Li, Y.Y. (2007) Carbon-containing nano-titania prepared by chemical vapor deposition and its visible-light-responsive photocatalytic activity. Journal of Molecular Catalysis A Chemical, 270 (1-2), 93-100. 

Li, Y., Ma, G., Peng, S., Lu, G., and Li, S. (2008) Boron and nitrogen co-doped titania with enhanced visible-light photocatalytic activity for hydrogen evolution. Applied Surface Science,... 

Moafi et al. [143] studied the ability of titania versus zirconia to photocatalyze methylene blue and eosin yellow on polyacrylonitrile fibers. Ti02 particles ranging from 10-20 nm in size and Zr02 particles ranging from 20-40 nm in size were dispersed on the fiber surface. Photocatalytic activity of Ti02 was greater. 

Li, Y. and Kim, S.J. (2005) Synthesis and characterization of nano titania particles embedded in mesoporous silica with both high photocatalytic activity and adsorption capability. Journal of Physical Chemistry B, 109, 12309-12315. 

Figure 12.1 Generation of photocatalytic active species at the surface of titania particles (NHE = normal hydrogen electrode).

Titania-silica aerogels possess very high surface areas (600 to 1000 m2/g) and large pore volumes (1 to 4 cm3/g), and thereby have attracted considerable interest for photocatalysis. A number of studies have shown that titania-silica intimate mixtures exhibit enhanced UV photocatalytic activity compared with pure titania [180-183],... 

A. Sclafani, M.N. Mozzanega, J.M. Herrmann, Influence of silver deposits on the photocatalytic activity of titania,... 

Chen, Q. Shi, H. Shi, W. Xu, Y. Wu, D., Enhanced visible photocatalytic activity of titania-silica photocatalysts effect of carbon and silver doping. CataLScience Techn. 2012,2 1213-1220. 

Malinowska, B., Walendziewski, J., Robert, D., Weber, J.V., Stolarski, M. 2003b. The study of photocatalytic activities of titania and titania-silica aerogels. Appl Catal B Environ 46 441-451. 

Figure 10. Photocatalytic activity of Au/titania nanocomposites containing 0 to 5 % Au in phenol-oxidation and chromium-reduction reactions [57].

We focus attention here on titania (Ti02) for the following reasons. The first is that titania is a widely used oxide support for both metal particles and metal oxides, and used in some cases also directly as catalyst (Claus reaction, for example). The second is that it possesses multifunctional properties, such as Lewis and Bronsted sites, redox centres, etc. The third is that it has several applications both as a catalyst and an advanced material for coating, sensors, functional films, etc. The fourth is its high photocatalytic activity which make titania unique materials. 

Stone YF Jr, Davis RJ. Synthesis, characterization, and photocatalytic activity of titania and niobia mesoporous molecular sieves. Chem Mater 1998 10 1468-1474. 

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