Anatase TiO2 single crystals with exposed {001} and {110} facets: facile synthesis and enhanced photocatalysis

Abstract

Anatase TiO(2) single crystals with exposed {001} and {110} facets have been successfully synthesized using a modified hydrothermal technique in the presence of hydrogen peroxide and hydrofluoric acid solution; these single crystals exhibited enhanced photocatalytic activities for degradation of Methylene Blue dye under ultraviolet light irradiation.

Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

“…In addition, the photo-oxidation ability with respect to the production of hydroxyl radicals and the decomposition of organic pollutants was enhanced to some extent by the presence of {001} facets by employing the previously cited materials [33,41,42,44,46,91]. Although the detailed geometrical and electronic structures of the majority of pollutant molecules adsorbed on {001} facets are not fully known, in general, the high-energy {001} facets are recognized to be more effective for dissociative adsorption of reactant molecules than the thermodynamically more stable {101} facets [14,92,93].…”

“…All precursors can apparently be used for tailoring both the percentage of {001} facets and the particles size, soluble precursors thus appearing not discriminating in growing the desired pure anatase crystals. However, some very recently employed insoluble precursors, such as Ti [46,47], TiN [48], TiS 2 [49] and TiB 2 [50] crystalline powders, seem to ensure unique properties consequent to TiO 2 doping, including visible light absorption and oxygen deficiencies formation.…”

TiO2-Impregnated Porous Silica Tube and Its Application for Compact Air- and Water-Purification Units

“…The significant difference between the TiO2-impregnated a-silica tube and the TiO2-coated a-silica tube by the OVD method may be caused by the particle size and crystal phase of the TiO2. The high photocatalytic property of the anatase phase and smaller particle size of TiO2 of the TiO2-impregnated a-silica tube led to an effective decomposition of gaseous compounds [8,9]. However, the removal ratio of the tube was slightly decreased during long-term treatment ( Figure 5).…”

“…Thus, Raman spectroscopy indicates that the TiO2 particles in the TiO2-impregnated a-silica tube consisted of anatase crystals. Anatase crystals with exposed high-energy facets, including (001) and (010) facets, have attracted significant attention because of their high photocatalytic property [8,9]. The combination of TiO2 particle size and crystal phase of the TiO2-impregnated a-silica tube are more effective than the TiO2-coated a-silica tube by the OVD method alone for photocatalytic capacity.…”

Synthesis of Single Crystalline Titanium Oxide and Sodium Titanate Nanorods Via Salt-Assisted Ultrasonic Spray Pyrolysis

“…These current synthesis routes require expensive precursors or templates and complicated or multi-step procedures, moreover, all of them are batch type processes which require a long reaction time and thus, the processes are not compatible for a cost-effective mass production. In addition, it is difficult to obtain single crystalline 1D TiO 2 nanostructures via the methods because the common titanium precursors for the solution-based methods exhibit a hydrolytic reaction rates which make it difficult to control their reaction processes and invariably lead to a mixture of different polymeric species [11][12].…”