Abstract

MoS₂ microspheres were synthesized via a facile hydrothermal method using (NH₄)₂MoO₄, H₂C₂O₄·2H₂O, and sodium dialkyldithiophosphate (NaDDP) as reactants. Herein, NaDDP plays a role of surfactant for the formation of the MoS₂ microspheres, unlike other different sulfur sources. The morphology and crystal structure of the MoS₂ microspheres were characterized using scanning electron microscope (SEM) and X-ray diffraction (XRD). The prepared MoS₂ microspheres were used as a catalyst for photocatalytic degradation of rhodamine B. The effect of the size of the MoS₂ microspheres on photocatalytic activity was investigated. For comparison, NaDDP was replaced by thiourea, thioacetamide and L-cysteine. The results indicate that the MoS₂ microspheres are spherical, and the diameter of the MoS₂ microsphere decreases with increasing concentration of oxalic acid in the reactants. The MoS₂ microspheres have hexagonal 2H-MoS₂ structure and preferentially grow along the (002) plane. In addition, it is found that when the concentration of oxalic acid is 0.075 mol/L, the best photocatalytic efficiency is 91.3% within irradiation time of 120 min and the reaction rate constant is 0.163 min^–1. The photocatalytic activity of MoS₂ synthesized from four sulfur sources can be arranged in the following order: NaDDP > thioacetamide > L-cysteine > thiourea.

摘要

以(NH ₄ ) ₂ MoO ₄、H ₂ C ₂ O ₄ ·2H ₂ O和二烷基二硫代磷酸钠(NaDDP)为反应物，通过水热法合成MoS _2微球。在此，与其他不同的硫源不同，NaDDP在MoS _{2微球的形成中发挥表面活性剂的作用。}使用扫描电子显微镜（SEM）和X射线衍射（XRD）对MoS _{2微球的形貌和晶体结构进行了表征。}制备的MoS ₂微球被用作光催化降解罗丹明B的催化剂。研究了MoS ₂微球的尺寸对光催化活性的影响。为了进行比较，NaDDP被硫脲、硫代乙酰胺和L-半胱氨酸替代。结果表明，MoS ₂微球呈球形，且MoS ₂微球的直径随着反应物中草酸浓度的增加而减小。MoS ₂微球具有六方2H-MoS ₂结构并优先沿（002）面生长。此外，还发现当草酸浓度为0.075 mol/L时，在120 min的照射时间内光催化效率达到91.3%，反应速率常数为0.163 min ^–1。_{四种硫源合成的MoS 2}的光催化活性顺序为：NaDDP>硫代乙酰胺>L-半胱氨酸>硫脲。

抽象的

以(NH ₄ ) ₂ MoO ₄、H ₂ C ₂ O ₄ ·2H ₂ O和二烷基二硫代磷酸钠(NaDDP)为反应物，通过水热法合成MoS _2微球。在此，与其他不同的硫源不同，NaDDP在MoS _{2微球的形成中发挥表面活性剂的作用。}使用扫描电子显微镜（SEM）和X射线衍射（XRD）对MoS _{2微球的形貌和晶体结构进行了表征。}制备的MoS ₂微球被用作光催化降解罗丹明B的催化剂。研究了MoS ₂微球的尺寸对光催化活性的影响。为了进行比较，NaDDP被硫脲、硫代乙酰胺和L-半胱氨酸替代。结果表明，MoS ₂微球呈球形，且MoS ₂微球的直径随着反应物中草酸浓度的增加而减小。MoS ₂微球具有六方2H-MoS ₂结构并优先沿（002）面生长。此外，还发现当草酸浓度为0.075 mol/L时，在120 min的照射时间内光催化效率达到91.3%，反应速率常数为0.163 min ^–1。_{四种硫源合成的MoS 2}的光催化活性顺序为：NaDDP>硫代乙酰胺>L-半胱氨酸>硫脲。