可见光响应型石墨烯/氧化铈复合材料的制备及性能  

Preparation and visible-light-induced photocatalytic activity of graphene/CeO_2 composites

作　　者：杨娟[1] 李丹[1] 马双彪 周亚洲[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2015年第3期348-352,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金青年科学基金资助项目(50902061)

摘　　要：采用水热法在不同的温度条件下制备了石墨烯/氧化铈复合粉体.通过XRD,SEM,TEM,TG,UV-vis光谱仪等分析手段对产物的结构和形貌进行了表征,并以甲基橙溶液为模拟废水,测试了所得到的催化剂在可见光照射下的光催化性能.研究结果表明:制备温度影响了复合材料的组成和结构;140℃制备所得样品,其石墨烯表面修饰的氧化铈含量最高,颗粒尺寸在20 nm左右,并且分布均匀.同时所制备出的石墨烯/氧化铈复合粉体对降解甲基橙表现出了良好的光催化活性.UV-vis和光电流分析表明,复合粉体表现出良好的可见光吸收能力和光生电子-空穴分离能力.The graphene / CeO2 composites were prepared by hydrothermal method at different temperatures. The sample structures were analyzed by XRD,SEM,TEM,TG and UV-vis spectrometer,and the photocatalytic activity of the samples was evaluated by degradation of methylene orange dye under visible light. The results indicate that grapheme / CeO2 composite with high loading percentage and relatively small particle size of about 20 nm can be prepared at 140 ℃. The obtained photocatalyst shows excellent photocatalytic activity under visible light,which is mainly attributed to the enhanced optical absorption in the visible region and the improved separation ability of photogenerated charges.

关 键 词：石墨烯/氧化铈 水热法 可见光催化剂 石墨烯 氧化铈 

分 类 号：TB322[一般工业技术—材料科学与工程]