复合半导体MoS2/Cu2O的制备及其光催化性能研究

Preparation and Photocatalytic Performance of Composite Semiconductor MoS_2/Cu_2O

采用两步法制备了MoS_2/Cu_2O催化剂,对其催化降解甲基橙(MO)性能进行了研究.首先,通过液相剥离和梯度离心获得少数层MoS_2纳米片,然后采用水热还原法在MoS_2纳米片上合成Cu_2O纳米颗粒,形成MoS_2/Cu_2O复合半导体,并分别通过扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、UV-Vis紫外可见漫反射光谱(DRS)等手段对催化剂的结构进行表征.在可见光下,MoS_2/Cu_2O复合半导体降解MO的效率明显高于纯MoS_2和Cu_2O.为了获得最佳光催化活性,探究了MoS_2质量分数(5%、10%、20%、30%、40%、50%)对MoS_2/Cu_2O复合半导体光催化降解MO的影响.最后,经过5次循环实验,MoS_2/Cu_2O降解率下降为82.5%,循环稳定性有待进一步提高.

The composite semiconductor MoS2/Cu2O catalyst was prepared by two step method and the photocatalytic degradation performance of methyl orange （MO） was studied. Firstly, MoS2 nanoparticles were synthesized by liquid phase stripping and gradient centrifugation, and then Cu2O nanoparticles were synthesized on MoS2 nanosheets by hydrothermal reduction method to form MoS2/Cu2O. The structure of the catalyst was characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and UV-Vis diffuse reflectance spectroscopy （DRS）. Under visible light, the degradation efficiency of MO over MoS2/Cu2O was significantly higher than that over pure MoS2 and Cu2O. In order to obtain the best photocatalytic activity, the effect of MoS2 mass fraction （5%, 10%, 20%, 30%, 40%, and 50%） on the photocatalytic degradation of MO over MoS2/Cu2O was investigated. Finally, after five cycling experiments, the degradation rate of MO over MoS2/Cu2O decreased to 82.5%, and the catalytic stability needed to be further improved.