Liu Xiaonan, Li Jinshan, Yao Weitang
College of Chemical Engineering, Sichuan University of Science & Engineering, Zigong 643000, PR China.
CAEP, Institute of Chemical Materials, Mianyang 621900, P. R. China.
ACS Omega. 2020 Oct 14;5(42):27463-27469. doi: 10.1021/acsomega.0c03968. eCollection 2020 Oct 27.
CdS@MoS hetero-structured nanocomposites (HSNPs) were successfully synthesized via a hydrothermal approach. The morphology and crystal structure of these composites as well as their ability to act as photocatalysts for the degradation of methylene blue were investigated using scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and UV-vis absorption spectroscopy. The developed CdS@MoS nanocomposites exhibited an 80% degradation rate with 30 min of visible light irradiation. To characterize the basis of the photocatalytic properties of these materials, the transient photocurrent densities were determined for the CdS@MoS HSNPs and pure dendritic CdS nanotrees. The results suggest that the photocatalytic activity may reflect electron transfer between the conduction band maximum of CdS and MoS. Additionally, the improved visible light absorption, decreased electron-hole pair recombination, and enhanced surface area for more effective dye absorption likely contribute to improved photocatalytic performance.
通过水热法成功合成了硫化镉@硫化钼异质结构纳米复合材料（HSNPs）。使用扫描电子显微镜、X射线衍射、透射电子显微镜和紫外可见吸收光谱对这些复合材料的形态、晶体结构及其作为光催化剂降解亚甲基蓝的能力进行了研究。所制备的硫化镉@硫化钼纳米复合材料在可见光照射30分钟时表现出80%的降解率。为了表征这些材料光催化性能的基础，测定了硫化镉@硫化钼HSNPs和纯树枝状硫化镉纳米树的瞬时光电流密度。结果表明，光催化活性可能反映了硫化镉和硫化钼导带最大值之间的电子转移。此外，可见光吸收的改善、电子-空穴对复合的减少以及有效染料吸收表面积的增加可能有助于提高光催化性能。
