ZnO-Zn_2TiO_4中空纳米纤维复合材料的制备及其光催化  

Preparation and Photocatalysis of ZnO-Zn_2TiO_4 Hollow Nano-fiber Complex Materials

作　　者：张春娥[1,2] 费鹏[1,2] 钟明 邓超 陈亚丽 苏碧桃[1,2] 

机构地区：[1]西北师范大学化学化工学院省部共建生态环境相关高分子材料教育部重点实验室 [2]甘肃省高分子材料重点实验室,兰州730070

出　　处：《材料导报》2013年第18期23-27,共5页Materials Reports

基　　金：国家自然科学基金(21174114);教育部"长江学者和创新团队发展计划"(IRT1177);甘肃省科技支撑计划(1204GKCA006);甘肃省自然科学基金(1010RJZA024);西北师范大学科技创新计划(kjcxgc-03-63)

摘　　要：利用棉花模板辅助的两步法制备了ZnO-Zn2TiO4中空纳米纤维结构光催化材料,利用热重分析(TG)、X射线衍射(XRD)、扫描电子显微镜(SEM)和紫外-可见光谱(UV-vis)等技术对其晶体结构、组成、形貌、光吸收特性等进行了表征。以罗丹明B(RB)的降解脱色为模型反应,考察了不同的钛-锌元素质量比(%)对复合材料光催化性能的影响。实验结果表明:所制得的ZnO-Zn2TiO4纳米纤维材料保留了棉花纤维的形貌;Zn2TiO4的引入极大地提高了ZnO材料在紫外光下的光催化活性,并且元素质量比为8%的前驱体在650℃焙烧2.5h时所得样品具有最佳的光催化效果。如在紫外光下,可使RB溶液反应2h的降解脱色率达96.44%,一级反应动力学常数k1达到1.142h-1。同时,该催化剂具有良好的稳定性能,重复使用5次,其对RB溶液的降解脱色率仍在86%以上。A facile template-assisted two-step method was employed to prepare ZnO-Zn2 TiO4 hollow fiber ma-terials by using defatted cotton fibers as the template.The structures,morphologies,compositions and optical absorp-tion properties of the prepared samples were characterized by thermogravimetry （TG）,X-ray diffraction （XRD）,scanning electron microscopy （SEM）,and UV-vis absorbance spectroscopy.By the photocatalytic degradation of rho-damine B （RB） on ZnO-Zn2TiO4 as the model reaction,the influence of different element mass ratios of Zn-Ti （％） on the photocatalytic property of the nano-composite materials was investigated under the irradiation of UV-light.The re sults indicated that,the samples replicated the morphology of original cotton fibers very well and had hollow fiber structure,the obtained sample from the precursor with suitable element mass ratios （8 ％） calcinated under 650 ℃ for 2.5 h shows the optimal photocatalytic property.For example,on the surface of ZnO-Zn2TiO4 hollow nano-fiber material,the decolorizing efficiency of RB solution was to 96.44 ％,and the first-order catalytic degradation kinetics constant （k1） reached 1.142 h-1 when irradiation time was 2 h under UV-light.In addition,the photocatalyst has good stability with the decolorizing rate remained above 86％ when it was repeatedly used for 5 times and easily removed from the system.

关 键 词：ZnO-Zn2TiO4 中空纳米纤维材料 模板辅助的两步法 光催化性能 

分 类 号：O643[理学—物理化学]