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Bi_2WO_6 hydrothermal / solvothermal synthesis, characterization and catalytic properties of visible light

Author: XuChunXiao
Tutor: HanGaoRongï¼›XuGang
School: Zhejiang University
Course: Materials Science
Keywords: Hydrothermal Solvothermal Self-assembled structures Nanoparticles Photocatalytic
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 283
Quote: 2
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Abstract


Bi 2 WO 6 as a typical response to new visible material, the research will improve solar efficiency, environmental cleanup and new energy development has potential practical value. The nano-sized materials, whether it is zero-dimensional nano quantum dots, one-dimensional nanowires, nanotubes, two-dimensional or three-dimensional nano nanospheres with its special topography causes photocatalyst adsorption capacity, photo- rate of separation of electrons and holes and other changes, which is different from the bulk material exhibits a special catalytic properties of visible light. Therefore, with regard to different morphologies and sizes of Bi 2 WO 6 nanostructures synthesis, characterization and properties are the focus of industrial applications. In this paper, polymer modifier is not added in the case prepared by hydrothermal Bi 2 WO 6 nano-assembly structure of its growth mechanism and under visible light irradiation photocatalytic activity for RhB. Also prepared by solvothermal Bi 2 WO 6 nanoparticles investigated the reaction solvent, time, pH and other experimental parameters on Bi 2 WO 6 nanostructures synthesis. Major achievements of this study are as follows: through the use of a mineralizing agent KOH pH of the system regulating the hydrothermal synthesis of several Bi 2 WO 6 nanostructures, including Bi < sub> 2 WO 6 flower-like balls, wafer and nanosheets. TEM and HRTEM results show that the Bi 2 WO 6 wafer is nanosheets [001] direction, directed self-assembled, the performance of the entire class of single crystal wafer features. For Bi 2 WO 6 wafer growth mechanism studies show that the growth process is an Ostwald ripening and orientation gather together in the process. Photocatalytic results showed that as the pH increased from 1 to 7, the prepared Bi 2 WO 6 powders for RhB degradation activity decreased from 98.9% to 39.9%. Ethylene glycol is used as solvent used successfully prepared with good crystallinity, narrow particle size distribution of the Bi 2 WO 6 nanoparticles (12nm). If the solvent is water change, get a larger particles Bi 2 WO 6 nanosheets, range in size between 30-300nm. Solvothermal synthesis of Bi 2 WO 6 than the hydrothermal synthesis of Bi 2 WO 6 and P-25 RhB degradation rate greater photocatalytic activity trends solvothermal (98.0%)> hydrothermal method (80.8%)> P-25 (20.2%). Solvothermal reaction time by adjusting the reaction time found to extend from 1h to 16h, the average size of the nanoparticles increases resulting from 9.1nm to 25.3nm. After 16h the solvent thermal reaction product only exists nanosheets and nanorods formed with a small amount.

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