Bi系異質結光催化劑的設計及其抗生素降解機理研究
[Abstract]:In recent years, Bi-B-based photocatalytic materials have attracted much attention because of their rich resources and response in visible region. However, the application of Bi photocatalytic materials is limited by the easy recombination of photogenerated electrons and holes. The formation of p-n heterojunction and morphology control are beneficial to the separation of photogenerated electrons and holes, and the photocatalytic properties of p-n heterojunction are improved. In this paper, BiOBr/BiVO_4 p-n heterojunction and BiOCl/BiVO_4 p-n heterojunction with special structure were designed and constructed by hydrothermal method and in-situ conversion method, respectively. The effects of different reaction conditions on the formation, morphology and photocatalytic properties of composites were investigated. The degradation performance and mechanism of antibiotic norfloxacin were studied by using composite materials. The experimental results show that when BiOBr/BiVO_4 p-n heterojunction is prepared, the efficiency of photocatalytic degradation of RhB in BiOBr/BiVO_4 composite. BiOBr-BiVOP 4p-n heterojunction can only be obtained when CTAB and HNO3 exist simultaneously. The photocatalytic degradation efficiency of RhB is higher than that of pure BiVO_4. This is mainly due to the fact that the built-in electric field formed between BiVO_4 and BiOBr can effectively inhibit the combination of photogenerated electrons and holes. The concentration of BiOCl/BiVO_4 p-n heterojunction has a significant effect on the morphology and properties of BiOCl/BiVO_4 composites. Because of the interaction of p-n heterojunction and special morphology, the photocatalytic properties of BiOCl/BiVO_4 composites interlaced with BiVO_4 mesoporous spindles were further improved. The degradation mechanism of norfloxacin was analyzed. Therefore, the degradation of antibiotics requires not only the effective separation of photogenerated electrons and holes, but also the strong oxidation ability of photogenerated holes.
【學位授予單位】:青島科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:O643.36;O644.1
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