凝胶网格控制合成纳米ZnO及其光催化活性  

Gel-Network Controlled Synthesis of ZnO Nanoparticles and Their Photocatalytic Activities

作　　者：汪应灵[1] 谢友海[2] 刘国光[2,3] 周建国[2] 周庆祥[2] 

机构地区：[1]新乡医学院化学教研室,河南新乡453003 [2]河南师范大学化学与环境科学学院黄淮水环境与污染防治省部共建教育部重点实验室,河南新乡453007 [3]广东工业大学环境科学与工程学院,广州510006

出　　处：《影像科学与光化学》2009年第3期207-214,共8页Imaging Science and Photochemistry

基　　金：国家自然科学基金资助项目(20877022);河南省基础与前沿技术研究项目(092300410105);河南省教育厅自然科学研究计划资助项目(2008A610007)

摘　　要：以明胶为反应介质,采用凝胶网格控制合成法制备了单分散球形纳米ZnO光催化剂.利用TG-DTA、XRD、TEM、BET、UV-Vis、HPLC等测试手段对制备过程、样品的结构和性能进行了研究,探讨了明胶浓度、煅烧温度对产物粒径和光催化活性的影响.结果表明:利用凝胶网格控制合成法不仅能够控制纳米微粒的形状和大小,而且可防止沉淀物相互聚集和团聚.以染料罗丹明B溶液为目标降解物,1 h的降解率为99.9%,最佳光催化剂的合成条件:13%明胶浓度、350℃煅烧2 h.ZnO nanoparticies have been prepared by means of a novel gel-network controlled synthesis method using gelatin as a template at lower temperature condition. The products were characterized by using TG-DTA, XRD, TEM, BET, UV-Vis and HPLC techniques. The products appeared to be regularly spherical or elliptical and their sizes range from 20 to 40 nm. The average particle size increased with increasing calcining temperature, and decreased with increasing gelatin concentration. Furthermore, photodegradation of Rhodamine B in aqueous solution was also investigated by using the ZnO nanopowders as the photocatalyst. It was found that the product（13% gelatin concentration） calcinated at 350 ℃for 2 h nearly induced 99.9 % degradation of Rhodamine B in lh.

关 键 词：纳米ZNO 凝胶网格控制合成法 光催化活性 罗丹明B 

分 类 号：O614.241[理学—无机化学] O643.36[理学—化学]