Zhang Zhongjie, Shao Shuwen, Dang Jingjing, Lu Changyu, Qin Fang, Guan Weisheng
College of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China E-mail:
Water Sci Technol. 2018 Mar;77(5-6):1204-1212. doi: 10.2166/wst.2017.631.
The ZnWO/AgPO nanocomposites synthesized by simple precipitation processes were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflectance spectra. The results indicated that the ZnWO nanorods dispersed well on the surface of AgPO particles and ball-and-rod structure p-n heterojunctions were successfully fabricated. In subsequent degradation experiments of methyl orange (MO), ZnWO/AgPO composites showed the highest photocatalytic activity compared to pure AgPO and ZnWO, due to the presence of ZnWO/AgPO heterojunctions, which could separate and transfer the electron-hole pairs generated by visible light and enhance the photocatalytic performance of the catalysts. The band gap structure and degradation mechanism of the enhanced photocatalytic materials are also discussed in this article. In conclusion, the ZnWO/AgPO composite is a promising and excellent photocatalyst for the degradation of dye wastewater under visible light irradiation.
通过简单沉淀法合成的ZnWO/AgPO纳米复合材料采用粉末X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）和紫外-可见漫反射光谱进行了表征。结果表明，ZnWO纳米棒很好地分散在AgPO颗粒表面，成功制备了球-棒结构的p-n异质结。在随后的甲基橙（MO）降解实验中，由于存在ZnWO/AgPO异质结，ZnWO/AgPO复合材料与纯AgPO和ZnWO相比表现出最高的光催化活性，该异质结可以分离和转移由可见光产生的电子-空穴对，并提高催化剂的光催化性能。本文还讨论了增强型光催化材料的带隙结构和降解机理。总之，ZnWO/AgPO复合材料是一种在可见光照射下用于降解染料废水的有前景的优异光催化剂。
