| Bi VO4 is a kind of visible-light-responsive photocatalysts. Bi VO4 can catalyze and degrade organic pollutants under visible light. Bi VO4 is widely studied because of its stable chemical properties, its relatively simple synthetic method and relatively high catalytic activity. But, because of the utilization rate of Bi VO4 to visible ligh is low and optical electronic- hole easy compound. As a result, the photocatalytic activity of Bi VO4 is low. So this paper research intends to improve its photocatalytic activity by nonmetal doping.(1) Hydrofluoric acid(HF) as F doping source, Using the sol-gel method and corn straw as templates.To prepare F doped Bi VO4 photocatalyst. The samples are characterized by XPS, XRD, SEM, BET and UV – Vis. Evaluate the photocatalytic activity of the samples through degrading methyl orange solution. The results show that all the samples copy the irregular cellular microstructure of corn straw. F doped unchanged crystalline type, but their crystal grain size is reduced. With the increase of F doping amount, particle size decreases. F replaces O in crystal to increase oxygen vacancy. In addition, light absorption ability of doped samples is enhancement, forbidden band width is smaller. When the HF doping amount is 0.07 ml, the degradation rate of methyl orange around 76%, increase 44% than before doping.(2) Six methyl tetramine, hydrofluoric acid and boric acid as the sources of doping elements N, F, B. Using the sol-gel method and corn straw as templates. To prepare F-B, F-N, B-N doped Bi VO4 photocatalyst. The samples are characterized by XRD, SEM, and UV – Vis. Evaluate the photocatalytic activity of the samples through degrading methyl orange solution. The results show that all the samples copy the irregular cellular microstructure of corn straw and double doping have strengthened the light absorption performance, reduces the forbidden band width. The activity of the double doping samples is higher than the single doping. |
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