CAJ | 학술논문

本实验以ZnSO_4和氧化石墨(Graphite Oxide,GO)原料,在低温环境下(60℃)制备了层状ZnO/RGO(ZnO/Reduced GraphiteOxide)复合材料.通过对ZnO/RGO复合材料进行XRD、VFIR、XPS和FE-SEM等测试,表征了产物的晶相结构、界面状况及微观形貌特征.氧化石墨在与ZnO的复合反应过程中其活性基团消失或减弱,氧化石墨自身被还原为一种类石墨物质(ReducedGO,RGO);GO的预处理过程对产物的形貌有较大影响,采用稀碱溶液对石墨的剥离处理有利于产物的层状结构形成.本文还以甲基橙为目标降解物,考察了不同条件下所得催化剂的紫外光催化性能.研究表明,ZnO/RGO纳米复合材料大大提高了ZnO紫外光催化活性.光致发光谱(PL)显示,ZnO/RGO复合材料的荧光发射峰强度比纯ZnO有较大降低,说明ZnO的光激发电子在氧化石墨的还原产物RGO和ZnO纳米颗粒之间存在界面电子转移效应.因而抑制了ZnO中光生电子-空穴对的复合,从而提高了ZnO的光催化性能.
본실험이ZnSO_4화양화석묵(Graphite Oxide,GO)원료,재저온배경하(60℃)제비료층상ZnO/RGO(ZnO/Reduced GraphiteOxide)복합재료.통과대ZnO/RGO복합재료진행XRD、VFIR、XPS화FE-SEM등측시,표정료산물적정상결구、계면상황급미관형모특정.양화석묵재여ZnO적복합반응과정중기활성기단소실혹감약,양화석묵자신피환원위일충류석묵물질(ReducedGO,RGO);GO적예처리과정대산물적형모유교대영향,채용희감용액대석묵적박리처리유리우산물적층상결구형성.본문환이갑기등위목표강해물,고찰료불동조건하소득최화제적자외광최화성능.연구표명,ZnO/RGO납미복합재료대대제고료ZnO자외광최화활성.광치발광보(PL)현시,ZnO/RGO복합재료적형광발사봉강도비순ZnO유교대강저,설명ZnO적광격발전자재양화석묵적환원산물RGO화ZnO납미과립지간존재계면전자전이효응.인이억제료ZnO중광생전자-공혈대적복합,종이제고료ZnO적광최화성능.
ZnO/RGO (ZnO/Reduced Graphite Oxide) composites were synthesized at low temperature (60 ℃) using ZnSO_4 and GO (Graphite Oxide) as precursors. The as-prepared samples have been characterized by X-ray diffraction (XRD), FTIR, X-ray Photoelectron Spectroscopy (XPS), Field Emission Scanning Electron Microscopy (FE-SEM), etc. During the formation the composites, GO was reduced to RGO (Reduced Graphite Oxide, RGO). The actives groups, such as C=O and C-O-C disappeared or sharply weakened, while C=C appeared in the reaction processes. The ZnO/RGO composites have layered structures, which greatly dependent on the pretreatment means of GO. Compared with pure ZnO, ZnO/RGO composites showed greatly enhanced UV photocatalytic activity. Photoluminescence (PL) spectra of ZnO/RGO showed a significant decline compared to that of pure ZnO, suggesting the inhibited recombination of excited electron hole pair (e~--h~+). The enhancement of photoeatalytic activity for ZnO/RGO could be attributed the migration effect of photoinduced electrons on the interface of RGO and ZnO.