水热合成六方柱状氧化锌及其光催化性能研究  

Preparation and Photocatalysis of Hexagonal Column-like ZnO Crystal by Hydrothermal Method

作　　者：徐晓虹[1] 刘淑洁[1] 吴建锋[1] 李先行[1] 倪杨[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《陶瓷学报》2011年第3期341-346,共6页Journal of Ceramics

基　　金：国家支撑计划项目(编号:2008BAC41B00)

摘　　要：以二水醋酸锌和六次甲基四胺为原料,采用温和水热法制备了六方柱状ZnO。采用X射线衍射(XRD)、扫描电镜(SEM)和紫外可见光谱对其物相、形貌和光催化性能进行了分析,着重研究了不同的反应条件对ZnO形貌的影响,探讨了六方柱状ZnO的形成机理。结果表明:溶液浓度、pH值、反应温度和反应时间对生成晶体的形貌和晶体质量都会产生影响。制备结晶良好的ZnO的最佳反应条件为:反应液浓度为0.57mol/L,pH值为6.0,反应温度为97℃,反应时间为16h。六方柱状ZnO晶体的形成机理是在一定的水热条件下,醋酸锌与六次甲基四胺水解后形成晶核,由于(0001)晶面的生长速率大于其它晶面,以及(0001)晶面易俘获原子,使得成核后的ZnO沿(0001)面定向生长,最终形成六方柱状结构。Various ZnO hexagonal column-like crystallites have been synthesized by hydrothermal method from zinc acetate and hexamethylenetetramine.X-ray diffraction（XRD）,scanning electron microscopy（SEM） and UV-Vis spectrum were used to analyze the crystal phase,microstructure and the photocatalytic property.The influence of different reaction conditions on the morphology of ZnO and mechanism of ZnO crystal growth were discussed in this study.The results showed that ZnO morphology and crystal quality were influenced by the concentration and pH value of the solvent,the reaction temperature and the reaction time.For achieving good crystallinity of ZnO,the concentration and the pH of the solvent were 0.57mol/L and 6.0,the temperature was 97°C,and the time was 16h.The growth mechanism of the hexagonal column-like ZnO crystal is that the ZnO crystal nucleuses are formed by hydrolysis of zinc acetate and hexamethylenetetramine under appropriate hydrothermal condition.Since the（0001） face has faster growth rate than the other faces and the（0001） face can easily capture atoms,ZnO crystal nucleuses grow along the（0001） direction,which results in forming hexagonal column-like structure finally.

关 键 词：水热法 六方柱状ZnO 反应条件 形貌 形成机理 

分 类 号：TQ174.75[化学工程—陶瓷工业]