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以硫酸氧钛为原料,采用水热法合成了草莓型TiO2@酵母催化剂微球,通过FE-SEM,XRD,FT-IR,UV-VIS等手段对催化剂的结构进行表征,以模拟Hg2+溶液为处理体系,考察TiO2@酵母菌微/纳米光催化剂的光催化活性。SEM和XRD结果表明:TiO2@酵母微球保持了酵母原有的形貌,有良好的分散性,TiO2为纯锐钛矿型,在酵母表面呈单分散状态,呈现出草莓结构。UV-VIS证实TiO2@酵母光催化剂具有较好的紫外光光响应能力。FT-IR分析表明酵母细胞壁和TiO2粒子的表面化学官能团有助于草莓结构的形成过程。在光催化处理Hg2+水溶液中,TiO2@酵母光催化剂呈现出来较好的催化效果,光催化性能的提高得益于生物吸附和光催化的协同效应。
The microstructure of the catalyst was characterized by means of FE-SEM, XRD, FT-IR and UV-VIS. The Hg2 + solution was Processing system to investigate the photocatalytic activity of TiO2 @ yeast micro / nano photocatalyst. The SEM and XRD results showed that TiO2 @ yeast microspheres maintained the original morphology of yeast with good dispersibility. TiO2 was pure anatase and showed a monodispersed state on the surface of yeast, showing a strawberry structure. UV-VIS confirmed that TiO2 @ yeast photocatalyst has good UV light response. FT-IR analysis showed that the surface chemical functional groups of yeast cell wall and TiO2 particles contributed to the formation of strawberry structure. In the photocatalytic treatment of Hg2 + aqueous solution, TiO2 @ yeast photocatalyst shows good catalytic effect, and the improvement of photocatalytic performance is due to the synergistic effect of biosorption and photocatalysis.