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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。
Using graphene oxide and ZnAc2 as reaction precursors, dimethylsulfoxide (DMSO) was used as the sulfur source and the reaction solvent. The ZnS-loaded reduced graphene oxide (RGO) composite material was prepared by one-step solvothermal method / RGO). The microstructure and chemical structure of the samples were characterized by SEM, XRD, Raman and fluorescence spectroscopy. The results show that ZnS / RGO composites prepared by in-situ reaction consist of nanosphere and uniform layered RGO layered structure with spherical and uniform loading. Under the simulated UV light irradiation, The catalytic results showed that the degradation efficiency of ZnS / RGO composites was significantly higher than that of pure ZnS. At the same time, the photocatalytic efficiency of ZnS / RGO composites remained unchanged during multiple cycles of catalytic reaction, indicating that the in situ reaction makes ZnS and RGO binding enhancement. Fluorescence spectroscopy results show that the main reason for the enhancement of photocatalytic efficiency of ZnS / RGO composites is that the photoelectrons in ZnS are effectively separated by RGO, and the electron-hole recombination efficiency is prolonged.