0D Cd-In-S 固溶体的制备及其光催化降解性能研究

由于含有 S3p 轨道,窄带隙金属硫化物的价带具有更高能级位置,能利用可见光降解有机污染物。文章通过一步法制备 0D Cd-In-S 三元固溶体,并考察其在可见光下催化降解甲基橙(methyl orange, MO)的性能。通过 X 射线衍射(X-ray diffraction, XRD)、透射电子显微镜(transmission electron microscope, TEM)、紫外-可见吸收光谱(UV-vis)等测试手段对固溶体纳米颗粒的结构、形貌和光学性能进行表征。研究发现,与 CdS、In $ _{2} $S $ _{3} $ 相比,合金化后的 Cd-In-S 固溶体具有更为优异的性质,其中 Cd $ _{0.7} $In $ _{0.3} $S $ _{1.15} $ 在 60 min 内对 MO 的降解效率可达 93.47%,远高于纯 CdS 和 In $ _{2} $S $ _{3} $;电化学研究数据表明,高降解效率来自于适宜的带隙位置和带宽以及更高的光生电子空穴对分离效率。

Due to the S 3p orbital, the valence band of metal sulfide with narrow band gap has higher energy level position, which has aroused great interest in the field of degradation of organic pollutants by visible light. In this paper, 0D Cd-In-S ternary solid solution was prepared by one-step preparation method, and its catalytic degradation of methyl orange(MO) under visible light was investigated. The structure, morphology and optical properties of the solid solution nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), and UV-vis spectroscopy. It is found that the alloyed Cd-In-S solid solution has better properties than CdS and $ In_{2}S_{3} $. The degradation efficiency of $ Cd_{0.7}In_{0.3}S_{1.15} $ to MO was up to 93.47% within 60 min, which was much higher than that of CdS and $ In_{2}S_{3} $. The electrochemical data shows that the high degradation efficiency comes from the appropriate band gap position and bandwidth, as well as the higher separation efficiency of photogenerated electron-hole pair.