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Hydrothermal Preparation of TiO2 Fibers and Complex Fluorides

Author: MaKai
Tutor: MaPeiHua
School: Institute of Qinghai Salt Lake
Course: Inorganic Chemistry
Keywords: Fibrous titania Complex fluorides Hydrothermal Mineralizing agent
CLC: O643.36
Type: Master's thesis
Year: 2005
Downloads: 292
Quote: 0
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Abstract


TiO 2 wide attention and research by scholars from various countries as a photocatalyst treatment applied to environmental contaminants . Diameter in the powder state of 5 ~ 50nm titania has a high catalytic activity , but the particles are small , difficult recovery, serious loss greatly reduces the specific surface area thereof is fixed to the substrate , the activity is decreased . Has a large specific surface area and pore volume of the pores , fluffy structure of titanium dioxide fiber solves this problem . Is generally a high temperature sintering method for preparing such titania fiber having catalytic activity , this paper attempts to hydrothermal method to synthesize such fibers as a mineralizing agent , potassium hydroxide and sodium hydroxide , respectively , observed in the different alkali concentrations and different temperatures titania changes in the morphology of the system had a high aspect ratio, and a fluffy structure of the titania fiber . The morphology of the fiber obtained in different mineralizing agent , a slight difference , and observed F - of this fiber crystal phase generated , the fibers SEM, XRD, TG, TEM characterization of its formation mechanism was discussed . Synthesized under mild hydrothermal conditions LiBaF 3 KMgF 3 KNiF 3 3 four kinds of composite KZnF fluoride , and SEM, XRD characterization , which the synthesis of KZnF 3 crystal phase purity, grain morphology of neat, uniform in size , can be used as optical, electrical , magnetic functional materials use . This method compared to the conventional high - temperature solid- phase synthesis techniques , conditions

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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