| Summary: | 碩士 === 國立東華大學 === 材料科學與工程學系 === 95 === Core-shell structure calcium bismuth oxide photocatalysts prepared by chemical impregnation method. The result indicated adding HNO3 can promoted the reaction. From the different reaction temperature experiments, we found that in the 500℃and 550℃have the best photocatalysic activities. Reacted in the 550℃，generated special band structure due to the core-shell structure. It makes the electron-hole pairs separated well.
From the different reaction temperature and time experiments, when the reaction temperature in the 450℃, a lot of Bi5O7NO3 were formed, and it decomposed during the second reaction. Temperature is the main factor of the calcium bismuth oxide phase formation. In the same reaction temperature, its phase are the same, and the phase ratio are slight different.
The Ca/Bi ratio is the important factor during the reaction. The higher Ca/Bi ratio, the better photocatalytic activities are observation, and the reacted in the 500℃ photocatalysts photocatalytic activities are better than reacted in the 450℃.
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