氧化锌粉体的制备、表征及其光催化性能的研究

Preparation,Characterization and Photocatalytic Activity of ZnO Powders

以硝酸锌(Zn(NO3)2.6H2O)、氢氧化钠(NaOH)为原料,在不同水热温度下(60℃、80℃、100℃、120℃、150℃、200℃)制备了不同形貌的氧化锌粉体(ZnO)。运用X射线衍射仪(XRD)、扫描电镜(SEM)、紫外-可见漫反射仪以及光化学反应仪对其进行了表征。结果表明,随着水热温度的升高,氧化锌的结晶越来越完善,形貌也由球状变化到椭球状、片状再到六棱柱。氧化锌粉体在波长为200～400nm的紫外光范围内具有很强的吸收,在可见光区域的吸收很弱。光催化降解模拟实验表明,80℃下所制备的氧化锌的催化效果最好。

ZnO powders are prepared by the hydrothermal method at different temperatures（60℃, 80℃, 100℃, 120℃, 150℃ and 200℃） using Zn（NO3）2· 6H2O, NaOH as reactants. The powders are characterized by X- ray diffraction（XRD）, scanning electron microscopy（SEM）, UV-vis diffuse reflectance spectrometer and photochemical reaction instrument. The results show that the crystallinity of powders increases with the increase of temperature and their morphology also change from spherical to ellipsoidal, sheet and then to hexagonal prism. A strong absorption appears in the ultraviolet region between 200nm and 400nm, but in the visible light region, the absorption is weak. Through the photocatalysis decomposed simulation experiment, it is found that the powders which prepared at 80℃ own the best photocatalytic activity.