分级微球BiOBr和BiOI的制备及光催化活性比较

摘要

以五水硝酸铋、溴化钠和碘化钾为原料，乙二醇为溶剂，采用一步溶剂热法制备了分级结构微球BiOBr和BiOI。比较了两种催化剂在可见光和模拟日光下对罗丹明B的降解效果。结果表明，在模拟日光和可见光下，BiO-Br的催化活性要好于BiOI，同时对机理进行了深入探讨。%The flower-like BiOBr and BiOI hierarchical microspheres were successfully synthesized via a facile one-step solvothermal method in ethylene glycol(EG)condition,using the Bi(NO3)3·5H2O,NaBr and KI as the raw materials. BiOBr’s and BiOI’s photocatalytic activities was compared by the photocata-lytic degradation of Rhodamine B. The results revealed that BiOBr exhibited a higher photocatalytic re-moval efficiency of RhB than BiOI under visible light and simulation solar irradiation. The possible mech-anism for the results was further proposed.