二硫化钼中空微球的制备、表征以及光催化性能(英文)

Fabrication,Microstructure and Catalytic Degradation Performance of MoS_2 Hollow Microspheres

以四丁基溴化铵为添加剂,采用水热法制备出直径为2～5μm的二硫化钼(MoS2)空心微球,研究了反应温度、添加剂量和时间对MoS2物相和形貌的影响。XRD、SEM、EDS、TEM、XPS表征结果表明,当反应温度为240℃时可得到结晶良好的六方相2H-MoS2,MoS2的形貌主要受四丁基溴化铵用量的影响,随着用量的增多MoS2历经了球状-花球状-不规则堆积状的递变。对MoS2中空微球的形成机制进行了探讨,认为在反应中四丁基溴化铵起到了模板的作用。通过制备样品对罗丹明B的降解评估了二硫化钼中空微球的光催化性能,其对罗丹明的降解效率达到90%。

Molybdenum disulfide （MoS2） hollow microspheres with the diameter of 2-5μm were synthesized using tetrabutylammonium bromide （BunNBr） as an additive by a hydrothermal method. The effect of temperature, time and concentration of Bu4NBr on the phase and morphology of MoS2 was investigated. The as-prepared MoS2 was characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, energy dispersive spectroscopy （EDS）, transmission electron microscope （TEM）, and X-ray photoelectron spectra （XPS）. The results indicate that hexagonal 2H-MoS2 can be formed at 240 ℃ with good crystallinity. The morphology of MoS2 crystal is greatly affected by the dosage of Bu4NBr. With the increase in the concentration of BuaNBr, the morphology of MoS2 changes from microspheres, via ball-flowers, to irregular packing. The templating mechanism is proposed to explain the formation of MoS2 hollow structures. Photocatalytic results show that the degradation rate of rhodamine B can reach to 90% by the MoS2 hollow microspheres under visible light irradiation.