PDF全文下载：2011050451
徐啸， 孟阿兰*
(青岛科技大学 化学与分子工程学院，山东 青岛 266042) 摘要： 以NH4HCO3、Zn(NO3)2、AgNO3及KBr为原料，采用两步液相沉淀法制备出AgBr/ZnO纳米复合材料，采用XRD、SEM、UV-Vis光度计等测试手段对产物物相、微观形貌及紫外-可见吸收光谱进行了表征，并通过正交试验优化了AgBr/ZnO纳米复合材料的制备工艺，研究了pH值、反应温度、光照强度等因素对产物光催化降解甲基橙性能的影响。结果表明，优选制备工艺条件：pH值6，反应温度55 ℃，KBr浓度0.040 0 mol·L-1，反应时间2 h。优选条件下制得的AgBr/ZnO纳米复合材料具有优良的光催化性能，以其为光催化剂，在300 W卤钨灯照射下，控制pH值为10，催化降解甲基橙（MO）1.5 h，其降解率超过95%。
关键词： AgBr/ZnO； 光催化； 模拟日光； 甲基橙； 纳米复合材料
中图分类号： TM 914文献标志码: AStudy on Preparation and Photocatalytic Activity
of AgBr/ZnO Nanocomposite XU Xiao, MENG A-lan
(College of Chemisty and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)Abstract: The AgBr/ZnO nanocomposites were prepared by two-step precipitation method, in which NH4HCO3, Zn(NO3)2, AgNO3and KBr were used as raw materials. The AgBr/ZnO nanocomposites were characterized by XRD, SEM and UV-Vis. The preparation technicses of AgBr/ZnO nanocomposites were optimized by the orthogonal experiment, and the effect of pH, reaction temperature and light intensity on methyl orange (MO) degradation rate was examined. The results show that the optimum preparation technicses of AgBr/ZnO nanocomposites are pH=6, T=55 ℃, c（KBr）=0.040 0 mol·L-1, t=2 h. The AgBr/ZnO obtained under optimum preparation conditions have excellent photocatalytic activity for degrading methyl orange (MO), and its degradation efficiency is exceeded 95% after 1.5 h irradiation under 300 W tungsten-halogen lamp and pH value of 10.
Key words: AgBr/ZnO； photocatalysis； simulative-sunlight； methyl orange； nanocomposites
收稿日期：2011-03-17
基金项目：国家自然科学基金项目(50572041，50972063)；山东省自然科学基金项目(Y2007F64)；山东省科技攻关计划项目(2006GG2203014)；山东省教育厅科研发展计划项目(J06A02)；青岛市应用基础研究项目(09-1-3-27-jch)；青岛市关键技术重大攻关计划项目(09-1-4-21-gx).
作者简介：徐啸(1986—)，男，硕士研究生.*通信联系人
