Cucurbit[n]urils/CdS-MoS_(2)的表征及可见光催化性能

Characterization and Visible Light Photocatalytic Activity of Cucurbit[n]urils/CdS-MoS_(2)

为了降低CdS光生电子-空穴的复合对其光催化性能的影响,利用窄带隙半导体MoS_(2)和有机大分子瓜环(cucurbit[n]uril,Q[n])对CdS进行改性研究.本文采用水热法合成了Q[n]/CdS-MoS_(2)(n=6,7,8)复合光催化剂.利用FT-IR、XRD、XPS、SEM、UV-Vis和PL等手段对产物结构、形貌和光学等性质进行表征,并考察Q[n]/CdS-MoS_(2)复合催化剂对次甲基蓝、罗丹明B和结晶紫溶液的催化降解性能.结果表明,瓜环对CdS-MoS_(2)颗粒生长结晶起到了调控作用,Q[n]/CdS-MoS_(2)(n=6,7,8)形成了具有花瓣状叶片的花团,催化剂表面积增大,活性位点增加,禁帝宽度减小,电子-空穴对得到I了更好的分离和迁移、Q[6]/CdS-MoS_(2)和Q[7]/CdS-MoS_(2)对亚甲基蓝具有良好的光催化活性,催化过程为羟基自由基原理.

In order to reduce the impact of CdS photogenerated electron-hole recombination on its photocatalytic performance,a narrow band gap semiconductor MoS_(2) and organic macromolecular cucurbit[n]urils(Q[n])were used to modify CdS.Q[n]/CdS-MoS_(2)(n=6,7,8)composite photocatalysts were synthesized by hydrothermal method.Infrared spectroscopy,X-ray diffraction,X-ray photoelectron spectroscopy,field emission scanning electron microscopy,ultraviolet-visible and photoluminescence spectrum were used to characterize the structure,morphology and optical properties of the products,and the catalytic degradation of the solutions of methylene blue,rhodamine B and crystal violet by Q[n]/CdS-MoS_(2) composite catalyst was investigated.The results showed that the Q[n]played a regulatory role on the growth and crystallization of CdS-MoS_(2) particles,Q[n]/CdS-MoS_(2)(n=6,7,8)formed flower clusters with petal-like leaves,the flower clusters of petal-like leaves increased the surface area and active sites of the catalyst,the Q[n]/CdS-MoS_(2) barrier width decreased,the electron-hole pair separation efficiency was improved in the Q[6]/Cds-MoS_(2).Q[n]makes the electron-hole pair to obtain better separation and migration.The Q[6]/CdS-MoS_(2) and Q[7]/CdS-MoS2 have good photocatalytic activity for methylene blue,and the catalytic process is based on hydroxyl radical principle.