Zhang Zhi-Bei, Li Xiao-Ming, Chen Fei, Yang Qi, Zhong Yu, Xu Qiu-Xiang, Yang Wei-Qiang, Li Zhi-Jun, Chen Xun-Feng, Xie Wei-Qiang
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Key Laboratory of Environmental Biology and Pollution Control(Hunan University), Ministry of Education, Changsha 410082, China.
Huan Jing Ke Xue. 2016 Jun 8;37(6):2393-2400. doi: 10.13227/j.hjkx.2016.06.050.
Visible light responsive heterojunctions of graphitic carbon nitride (g-CN) and BiS were successfully designed and constructed by a simple solvothermal process. The as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflectance spectroscopy (DRS). Under visible light irradiation, the as-prepared g-CN/BiS photocatalysts exhibited highly enhanced photochemical efficiency in the degradation of methyl orange (MO) compared with pure g-CN and BiS. On the basis of the calculated energy bands, the excellent enhancement was attributed to the efficient separation of photoinduced electron-hole pairs. In addition, a detailed degradation pathway of MO degradation by g-CN/BiS composites was proposed to further elucidate the inner photodegradation mechanism. This research may provide a cost-effective and easy-scaling up approach to develop visible-light-driven photocatalysts, which could be applied in wastewater treatment.
通过简单的溶剂热法成功设计并构建了石墨相氮化碳（g-CN）和BiS的可见光响应异质结。采用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、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（DRS）对所制备的样品进行了表征。在可见光照射下，与纯g-CN和BiS相比，所制备的g-CN/BiS光催化剂在降解甲基橙（MO）方面表现出高度增强的光化学效率。基于计算出的能带，这种优异的增强归因于光生电子-空穴对的有效分离。此外，还提出了g-CN/BiS复合材料降解MO的详细途径，以进一步阐明其内部光降解机制。该研究可能为开发可见光驱动的光催化剂提供一种经济高效且易于扩大规模的方法，可应用于废水处理。
