Henan Key Laboratory for Environmental Pollution Control, College of Chemistry and Environmental Sciences, Henan Normal University, Xinxiang, Henan 453007, PR China.
J Hazard Mater. 2009 Dec 30;172(2-3):1520-6. doi: 10.1016/j.jhazmat.2009.08.022. Epub 2009 Aug 12.
A novel dumbbell-shaped ZnO microcrystal photocatalyst was successfully synthesized by hydrothermal method in the present study. The prepared ZnO photocatalyst was systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TG-DTA), photoluminescence spectrum (PL) and UV-vis absorption spectrum (UV-vis). The characterizations of dumbbell-shaped ZnO were also compared with the commercial ZnO. The results show that the prepared ZnO photocatalyst has a unique dumbbell shape and it belongs to the hexagonal wurtzite family. In addition, the photocatalytic activity of the prepared dumbbell-shaped ZnO microcrystal photocatalyst was evaluated by the degradation of three different kinds of dyes wastewater (Crystal Violet, Methyl Violet and Methylene Blue). After 75 min reaction, the decolourization efficiencies of the three kinds of dyes wastewater achieved 68.0%, 99.0% and 98.5%, the TOC removal efficiencies achieved 43.2%, 59.4% and 70.6%, respectively. Compared to commercial ZnO, 16-22% higher TOC removal efficiency was obtained by the dumbbell-shaped ZnO. The results indicated that the prepared dumbbell-shaped ZnO microcrystal photocatalyst showed good photocatalytic activity and it could be considered as a promising photocatalyst for dyes wastewater treatment.
本研究通过水热法成功合成了一种新型哑铃状 ZnO 微晶体光催化剂。采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、热重分析（TG-DTA）、光致发光光谱（PL）和紫外可见吸收光谱（UV-vis）对制备的 ZnO 光催化剂进行了系统的表征。并将哑铃状 ZnO 的特征与商业 ZnO 进行了比较。结果表明，所制备的 ZnO 光催化剂具有独特的哑铃形状，属于六方纤锌矿家族。此外，通过降解三种不同类型的染料废水（结晶紫、甲基紫和亚甲基蓝）评估了所制备的哑铃形 ZnO 微晶体光催化剂的光催化活性。反应 75 分钟后，三种染料废水的脱色率分别达到 68.0%、99.0%和 98.5%，TOC 去除率分别达到 43.2%、59.4%和 70.6%。与商业 ZnO 相比，哑铃形 ZnO 可获得 16-22%更高的 TOC 去除效率。结果表明，所制备的哑铃状 ZnO 微晶体光催化剂具有良好的光催化活性，可作为处理染料废水的一种有前途的光催化剂。
