| Summary: | 碩士 === 國立臺北教育大學 === 自然科學教育學系 === 106 === Photocatalytic solar energy conversion is regarded as a promising way to resolve environmental crisis and energy shortage. Bismuth oxybromide, which is a visible light driven photocatalyst, has been widely researched due to its suitable band structure and layered structure. As a rising material, it is important to solve the combination of electron-hole pairs which causes the low quantum yield during the photoreaction. By modulating the morphology and the band structure of semiconductors, this situation can be tackled.
In our research, a new heterostructure of BiOBr was prepared through a hydrothermal synthesis by introducing surfactants and their photocatalytic activity were investigated via decontaminating several kinds of wastewater including Rhodamine B, ciprofloxacin, tetracycline and bacteria strain under the visible light LED lamp irradiation. With the increasing stoichiometric amount of bismuth, the thickness of BiOBr nanosheets transformed from 20 nm to about 9 nm and gradually assembled into hierarchical microsphere during the synthesis. In several characterizations, TEM and SEM images will confirm the surface morphology and the crystal structure of BiOBr. UV-Vis DRS spectra could be used to evaluate the band gap and optical properties of the materials. Also, the radical quenching experiment will further elucidate the main BiOBr generated active ROS species in the degradation of the contaminants as well as EPR analysis. In addition, the proposed photocatalytic mechanism will be verified in our later works.
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