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Low-temperature Synthesis of InVO4 Sol and Photocatalytic Activities of InVO4-TiO2 Composite Thin Films

Author: FangHaiBo
Tutor: XuMingXia
School: Tianjin University
Course: Materials Science
Keywords: InVO4 Hydrothermal Composite photocatalyst Visible light activity Hydrothermal Crystallography
CLC: TB383.2
Type: Master's thesis
Year: 2007
Downloads: 113
Quote: 1
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Abstract


InVO 4 as a new narrow band gap semiconductor material, the band gap energy is low and the conduction band than TiO 2 more negative, it is envisaged that InVO 4 -TiO 2 composite material should have good visible response performance. In this paper, indium chloride (InCl3), ammonium metavanadate (NH 4 VO 3 ) and ammonia as raw materials, low-temperature hydrothermal a milky InVO 4 sol, which effectively reduces the synthesis InVO 4 temperature. The above InVO 4 sol and laboratory homemade peroxotitanic acid reflux sol (RS sol) mixing to obtain a mixed sol, this hybrid sol as precursor of InVO 4 -TiO 2 composite photocatalytic film. By means of a detailed study of a variety of characterization of process parameters on the final product water treatment phase, grain size and grain morphology, light absorption properties of composite films and photocatalytic activity. Experimental results show that the hydrothermal preparation process the pH of the reaction system, the water phase of the target treatment temperature has an important impact generated. As the treatment temperature, treatment time and the filling degree of the increase, InVO 4 grain size and particle size distribution are gradually increased, the crystal morphology is changed, there four square shape of the crystal. Hydrothermal crystallization from the perspective, according to the in situ growth mechanism model to study InVO 4 sol under hydrothermal conditions and grain formation mechanism of aggregation, the process can be considered a precursor In (OH ) 3 after removal of hydroxyl groups, by ion-situ rearrangement into orthorhombic InVO 4 . From the spatial structure of growth units starting to build four square grain morphology and InVO 4 link between growth units. This experiment also compared the TiO 2 Films and InVO 4 -TiO 2 composite photocatalytic film in the UV and visible light photocatalytic activity under irradiation . The results show that under UV irradiation, the composite film showed the best photocatalytic activity; 15h after irradiation in the visible, InVO 4 doping amount of 3.0wt% of the low-temperature preparation of composite films of methyl orange decolorization rate reached 80.1%, InVO 4 is 0.5wt% doped high-temperature preparation of composite films on the decolorization rate reached 25.1%. This is because, InVO 4 outer electrons absorb energy from the ground state to an excited state, the excited electrons injected into the neighboring TiO 2 of the conduction band, thus preventing photo- electrons and holes recombine in a short time, achieve InVO 4 of photoinduced electron and hole effective separation of improving film of visible light activity.

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