Yang Yang, Lai Min, Huang Jialei, Li Jinze, Gao Ruijie, Zhao Ziming, Song Huatang, He Jixiang, Ma Yan
Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science and Technology, Nanjing, China.
School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing, China.
Front Chem. 2021 Dec 14;9:781991. doi: 10.3389/fchem.2021.781991. eCollection 2021.
BiOI/g-CN p-n junctioned photocatalysts were synthesized by alcohol-heating and calcination in air. The structures, morphologies and optical properties of as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DRS). Photocatalytic activity of the heterojunctioned composites were evaluated by degradation of Rhodamine B (RhB) and tetracycline hydrochloride (TCH) under visible light illumination. The results indicated that the composites exhibited superior efficiencies for photodegradation of RhB and TCH in comparison with pure BiOI, BiOI and g-CN. An effective built-in electric field was formed by the interface between p-type BiOI and n-type g-CN, which promoted the efficient separation of photoinduced electron-hole pairs. In addition, 8% BiOI/g-CN composite showed excellent photostability in a five-cycle photocatalytic experiment. Experiments on scavenging active intermediates revealed the roles of active species.
通过乙醇加热和空气中煅烧合成了BiOI/g-CN p-n结光催化剂。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、紫外-可见漫反射光谱（DRS）对所制备样品的结构、形貌和光学性质进行了表征。通过在可见光照射下降解罗丹明B（RhB）和盐酸四环素（TCH）来评估异质结复合材料的光催化活性。结果表明，与纯BiOI、BiOI和g-CN相比，该复合材料对RhB和TCH的光降解表现出更高的效率。p型BiOI和n型g-CN之间的界面形成了有效的内建电场，促进了光生电子-空穴对的有效分离。此外，8%的BiOI/g-CN复合材料在五循环光催化实验中表现出优异的光稳定性。清除活性中间体的实验揭示了活性物种的作用。
