一种新型增强可见光催化性能MoS2/电气石/石墨烯三元复合材料的制备

通过一步水热法制备了MoS₂-石墨烯-电气石(MoS₂-GR-T)复合光催化剂。拉曼光谱显示氧化石墨烯被还原为石墨烯。紫外可见漫反射光谱分析表明,MoS₂、MoS₂-T和MoS₂-GR-T样品的带隙能量分别为2.01、1.91和1.79 eV,证明电气石的引入降低了禁带宽度。以罗丹明B染料为模拟污染物,在氙灯照射下研究了复合材料的光催化性能。与MoS₂和MoS₂-GR相比,MoS₂-石墨烯-电气石(MoS₂-GR-T)复合材料表现出更好的光催化降解活性。在光照60 min时,罗丹明B的降解率达93.9%。MoS₂-GR-T复合材料的光催化活性增强主要是由于其表面暴露出更多的光催化活性位点,提高了光吸附能力和电荷分离效率。研究结果表明,无金属助催化剂与极性矿物偶联可以提高光催化剂的电荷效率。

Preparation of a Novel MoS2/Tourmaline/Graphene Ternary Composite with Enhanced Visible-light Photocatalytic Property

MoS₂-Graphene-Tourmaline(MoS₂-GR-T)composite photocatalyst was prepared via one-step hydrothermal method.Raman spectroscopy showed that GO was reduced to graphene.The band gap energies of MoS₂,MoS₂-T and MoS₂-GR-T samples were 2.01,1.91 and 1.79 eV,respectively.It improved that the introduction of tourmaline reduced the band gap width.The photocatalytic performance of rhodamine B dye was demonstrated under xenon lamp irradiation.Compared with MoS₂ and MoS₂-GR,MoS₂-Graphene-Tourmaline(MoS₂-GR-T)composites exhibited better photocatalytic degradation activity,and reaching 93.9%after exposure to 60 min of light.The enhanced photocatalytic activity of MoS₂-GR-T composite was mainly due to its exposed adsorption-photocatalytic active sites,which improve the photo-adsorption capacity and charge separation efficiency.This paper showed that the metal-free co-catalyst coupled with polar minerals could improve the charge efficiency of photocatalyst.