CdMoO_4@酵母菌核壳型光催化剂的制备及性能  

Fabrication of CdMoO_4 @ yeasts photocatalysts with core-shell structure and their performance

作　　者：白波[1] 宋蕊[1] 陈兰[1] 关卫省[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：《西北大学学报（自然科学版）》2013年第4期574-579,共6页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(21176031);中国博士后特别基金资助项目(201104615);陕西省自然科学基金资助项目(2011JM2011)

摘　　要：以酵母菌为核，利用水热法，获得了CdMoO4@酵母菌核一壳结构型光催化剂。采用XRD，FE．sEM，EDX，uV—VIS对产品的结构进行了表征，测试了CdMoO4@酵母菌光催化剂的悬浮性能，评价了其光催化活性。结果表明，CdMoO4@酵母茵光催化剂的形貌为椭球形，粒径在4．1～4．3μm之间，分散性好；复合光催化剂表面上的纳米CdMoO4为四方相白钨矿，对可见光具有响应。结合FT-IR分析，CdMoO4@酵母菌光催化剂的形成机理可以概括为吸附～成晶过程。在光催化降解碱性嫩黄O废水中，CdMoO4@酵母菌复合光催化剂表现出了良好的悬浮性能和光催化活性。催化活性的提高得益于酵母茵核的生物吸附和纳米CdMoO4光催化之间的耦合效应。CdMoO4 @ yeasts photocatalysts with core-shell structure were prepared by using yeasts as structure-directing scaffold. The obtained micro-spheres were characterized by XRD, FE-SEM, EDX and UV-Vis, respectively. The results indicated that the diameter of hybrid photocatalyst microspheres was about 4. 1 -4.3 μm and possessed a good mono-dispersity with an ellipsoidal shape. CdMoO4 particles on the surface of microspheres are attributed to the tetragonal scheelite crystal structure, which has a distinct trait in answer to the visible lights spectra. FT-IR ascertained that the formation mechanisms of CdMoO4@ yeasts functional hybrid microspheres can be deduced to the two steps, including absorption and subsequent crystallization. The CdMoO4@ yeasts composite photocatalysts had superior suspension abilities and exhibited a high photocatalytic activity for the degradation of Basic Flavine O dye wastewater. The causes for the enhancement of photocatalytic activity are assigned to the combined effect of biosorption at the yeast core and photocatalytic degradation driven by the attached CdMoO4 nanoparticles.

关 键 词：光催化剂 酵母 钼酸镉 核壳结构 

分 类 号：X13[环境科学与工程—环境科学]