CdS/RGO/MoS2复合材料的制备及光催化性能

Preparation of CdS/RGO/MoS2 composite and Its and Photocatalytic Performance

摘要:

本文采用简单的水热方法制备出CdS/RGO/MoS2复合材料，并通过X射线衍射（XRD）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（UV-Vis DRS）、电化学阻抗（EIS）和瞬态光电流响应测试等对其进行表征。结果表明，在可见光照射下，CdS/0.75 wt% RGO /1.0 wt% MoS2复合材料对甲基橙（MO）具有显著的光催化降解活性和稳定性。其光降解速率（0.05777 min-1）分别是CdS（0.023 min-1） 和MoS2（0.003 min-1）的2.5倍和19.3倍，是CdS/0.75 wt% RGO（0.02821 min-1）和CdS/1.0 wt% MoS2（0.02677 min-1）的2倍和2.16倍。经过5个循环后，降解效果未见明显变化，证明催化体系的稳定性良好。光催化剂活性的提高主要归功于复合材料的形成能够改善组分的能带匹配和界面电荷转移，从而增强载流子的分离和迁移。这些材料在可见光降解甲基橙方面具有优异的光催化活性和良好的稳定性，这使得其污染物降解和处理等方面可以发挥良好的作用，具有广泛的应用前景和理论意义。

Abstract:

Abstract: In this paper, CdS/RGO/MoS2 composites were prepared by simple hydrothermal method. They were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-visible diffuse reflectance spectroscopy (UV-VIS DRS), electrochemical impedance (EIS) and transient photocurrent response. The results showed that CdS/0.75 wt % RGO/ 1.0 wt % MoS2 composite had significant photocatalytic degradation activity and stability for methyl orange (MO) under visible light irradiation. The photodegradation rate (0.05777 min-1) was 2.5 times than that of CdS (0.023 min-1), 19.3 times than that of MoS2 (0.003 min-1), 2 times than that of CdS/0.75 wt% RGO (0.02821 min-1) and 2.16 times than that of CdS/1.0 wt% MoS2 (0.02677 min-1)，respectively. After 5 cycles, the degradation effect did not change significantly, which proved that the catalytic system had good stability. The increase in photocatalyst activity was mainly due to the formation of composite materials, enhancing the separation and migration of carriers. These materials had excellent photocatalytic performance and good stability for the photodegradation of MO under visible light irradiation, thus had a wide range of application prospects and theoretical significance.