Yin Hao Yong, Zheng Yi Fan, Song Xu Chun
College of Materials & Environmental Engineering, Hangzhou Dianzi University Hangzhou 310018 P. R. China.
Research Center of Analysis and Measurement, Zhejiang University of Technology Hangzhou 310014 P. R. China.
RSC Adv. 2019 Apr 9;9(20):11005-11012. doi: 10.1039/c9ra01416k.
A series of novel BiPO-BiOBr I p-n heterojunctions were successfully prepared by a facile solvothermal method. The morphology, structure and optical properties of photocatalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet visible diffuse reflectance spectroscopy. The visible light photocatalytic activities of BiPO-BiOBr I heterojunctions were investigated by photocatalytically reducing CO. After 4 hours of irradiation, the 5% BiPO-BiOBrI heterojunction showed the highest photocatalytic activity with the yields of CO and CH up to 24.9 and 9.4 μmol g respectively. The improved photocatalytic activity may be due to the formation of BiPO-BiOBr I p-n heterojunctions which can effectively restrict the recombination rate of the photoexcited charge carriers. Moreover, the energy band structure of BiPO-BiOBr I heterojunctions could be easily adjusted by changing the mole ratio of I and Br. The possible mechanism of the enhancement of the photocatalytic performance was also proposed based on experimental and theoretical analysis. The present study may provide a rational strategy to design highly efficient heterojunctions with an adjustable energy band for environmental treatment and energy conversion.
通过简便的溶剂热法成功制备了一系列新型BiPO-BiOBr I p-n异质结。采用扫描电子显微镜（SEM）、X射线衍射（XRD）和紫外可见漫反射光谱对光催化剂的形貌、结构和光学性质进行了表征。通过光催化还原CO研究了BiPO-BiOBr I异质结的可见光光催化活性。光照4小时后，5%的BiPO-BiOBrI异质结表现出最高的光催化活性，CO和CH的产率分别高达24.9和9.4 μmol g。光催化活性的提高可能归因于BiPO-BiOBr I p-n异质结的形成，它可以有效地限制光生载流子的复合率。此外，通过改变I和Br的摩尔比可以轻松调节BiPO-BiOBr I异质结的能带结构。基于实验和理论分析，还提出了光催化性能增强的可能机制。本研究可能为设计具有可调能带的高效异质结用于环境处理和能量转换提供合理策略。
