Department of Environmental Science, School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China , Heilongjiang University , Harbin 150080 , P. R. China.
Department of Epidemiology and Biostatistics , Harbin Medical University , Harbin 150086 , P. R. China.
ACS Appl Mater Interfaces. 2019 Feb 20;11(7):7104-7111. doi: 10.1021/acsami.8b21131. Epub 2019 Feb 5.
Oxygen-doped MoS nanospheres/CdS quantum dots/g-CN nanosheets are synthetized through hydrothermal and chemical bath deposition-calcination processes. The prepared materials are characterized by X-ray diffraction transient-state photoluminescence spectra, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical experiment. These results show that the ternary composite material has longer lifetime of photogenerated carriers and more active sites, thereby enhancing photocatalytic performance. CdS quantum dots act as a bridge between the intermediate transport charges in the ternary composite. The oxygen defect engineering prolongs the lifetime of carriers obviously, which is confirmed by transient-state photoluminescence. Moreover, the photocatalytic H evolution and photodegradation of bisphenol A for MoS/CdS/g-CN is up to 956 μmol h g and 95.2% under visible-light irradiation, respectively. Furthermore, excellent photocatalytic activity can be ascribed to the synergistic effect of defect engineering and formation of ternary heterostructures, which is with broad-spectrum response, longer lifetime of photo-induced electron-holes, and more surface active sites.
氧掺杂 MoS 纳米球/CdS 量子点/g-CN 纳米片通过水热和化学浴沉积-煅烧过程合成。所制备的材料通过 X 射线衍射、瞬态光致发光光谱、透射电子显微镜、扫描电子显微镜、X 射线光电子能谱和电化学实验进行了表征。这些结果表明，三元复合材料具有更长的光生载流子寿命和更多的活性位，从而提高了光催化性能。CdS 量子点在三元复合材料中充当中间传输电荷的桥梁。氧缺陷工程明显延长了载流子的寿命，这一点通过瞬态光致发光得到了证实。此外，MoS/CdS/g-CN 在可见光照射下的光催化 H 2 析出和双酚 A 的光降解分别高达 956 μmol h g 和 95.2%。此外，优异的光催化活性可归因于缺陷工程和三元异质结构形成的协同效应，具有宽光谱响应、更长的光生电子-空穴寿命和更多的表面活性位。
