Optical and photocatalytic properties of nanocrystalline ZnO powders synthesized by a low-temperature hydrothermal method

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• 作者：Yang Zhou^a ; Linhua Xu^a ; ^b ; ^{congyu3256@sina.com} ; Zijun Wu^a ; Pei Li^a ; Jiaojiao He^a
• 关键词：Nanocrystalline ZnO powders ; Hydrothermal method ; Photocatalytic activity ; Optical bandgap ; Photoluminescence
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：673-680
• 全文大小：1524 K
• 卷排序：130

文摘

In this work, nanocrystalline ZnO powders were prepared by a low-temperature hydrothermal method using zinc nitrate and hexamethylenetetramine (HMT) as the Zn and alkaline source, respectively. The influence of the concentration of HMT in the growth solutions on the structural, optical and photocatalytic properties of nanocrystalline ZnO powders was investigated. The results showed that the ZnO powders were composed of lots of ZnO nanoparticles; the different concentration of HMT had almost no influence on the crystalline structure of the ZnO particles. However, with the increase of HMT concentration, the size of the ZnO particles and the ultraviolet emission decreased gradually while the visible emissions gradually enhanced. The photocatalytic tests showed that all the samples exhibited good photocatalytic degradation performance for Rhodamine B (RhB). With the increase of HMT concentration, the photocatalytic activity of the ZnO powders was also enhanced. The enhanced photocatalytic activity was ascribed to the increase of the specific surface area and oxygen vacancies on the surface of the particles.