原位反应制备ZnS/还原氧化石墨烯复合材料及其光催化性能

摘要

以氧化石墨烯和ZnAc2为反应前驱物,采用二甲基亚砜(DMSO)作为硫源和反应溶剂,通过一步溶剂热法原位制备出负载ZnS的还原氧化石墨烯(RGO)复合材料(ZnS/RGO).采用SEM、XRD、激光拉曼(Raman)和荧光光谱对样品的微观形貌和化学结构进行表征.结果显示: 原位反应制备的ZnS/RGO复合材料是由呈圆球状并均匀负载的纳米ZnS和6~7层RGO层状结构组成;在模拟紫外光照射下,对甲基橙污染物的光催化结果表明,ZnS/RGO复合材料的降解效率明显高于纯ZnS;同时,在多次循环催化过程中,ZnS/RGO复合材料的光催化效率仍基本保持不变,表明原位反应使ZnS与RGO结合增强.荧光光谱结果表明,ZnS/RGO复合材料光催化效率增强的主要原因在于ZnS中光生电子通过RGO得到有效的分离,进而延长了电子-空穴的复合效率.%ZnS decotrated onto reduced graphene oxide(RGO) composite (ZnS/RGO) had been synthesized through one-step in-situ solvothermal reaction using ZnAc2 and graphene oxide as reaction precursor and dimethyl sulfoxide (DMSO) as a source of sulfur and reaction solvent.SEM、XRD、Raman and fluorescence spectroscopy had been used to characterize microtopography and chemical structure of ZnS and ZnS/RGO.The results show that the ZnS/RGO composite synthesized through in-situ reaction consists of uniformly decorated spherical ZnS particles and 6-7 layer-structured RGO sheets.Under the simulated ultraviolet irradiation,the photocatalytic results for methyl orange pollutants show that the degradation ratio of ZnS/RGO hybrid is remarkly higher than that of pure ZnS.During the recycling degradation process photocatalytic efficiency of ZnS/RGO remain stable,which demonstrates in-situ reaction enhance the interaction between ZnS and RGO.Fluorescence spectroscopy result shows enchanced photocatalytic degradation efficiency of ZnS/RGO hybrid is mainly attributed to in-situ incorporation of ZnS with RGO sheets,which can efficiently transfer the excited photoelectrons from ZnS to conjugated graphene structures,and further enlarges recombination efficiency of photogenergated electron-hole.