水热合成TiO_2@酵母草莓结构微球及其光催化性能  

Hydrothermal synthesis of TiO_2@yeast raspberry-structure microspheres with photocatalytic properties

作　　者：李宏颖[1] 秦昉[1] 白波[1] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054

出　　处：《化学工程》2014年第4期59-63,78,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21176031);陕西省自然科学基金资助项目(2011JM2011);中国博士后特别资助项目(201104615);中央高校基本科研业务费专项资金项目(2013G2291015)

摘　　要：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 novel raspberry-like TiO2@yeast hybrid microspheres were fabricated by simple hydrothermal method. The products were analyzed by Field emission scanning electron microscopy （FE-SEM） , X-ray diffraction （XRD）, Fourier transformed infrared spectroscopy （b^F-IR） and Ultraviolet-visible spectrophotometry （UV-VIS）, respectively. FE-SEM shows that the TiO2@yeast hybrid microspheres have the ordered and uniform size of elliptic shapes and good dispersity. XRD pattern indicates that the crystal structure of synthesized TiO2@yeast microsphere is anatase, and TiO2 disperses onto the surface of yeast in a monolayer state. The interaction of chemical bonds between host yeast core and guest TiO2 nanopartieles was investigated by FT-IR spectroscopy. UV-VIS exhibits the improved ultraviolet photocatalytic property of TiOz@yeast hybrid microspheres. The effectiveness of the raspberry- like hybrid TiO2@yeast microspheres is confirmed by removing Hg2＋. The excellent removal efficiency of Hg2＋ is attributed to the combined effect of bio-sorption of the yeast and photoeatalytie degradation driven by the attached Ti02 nanoparticles.

关 键 词：光催化 水热法 草莓结构 二氧化钛 酵母 汞离子 

分 类 号：O643.36[理学—物理化学]