摘要
半导体光催化氧化技术在处理能源危机和环境污染问题方面有非常重要的应用。选取石墨烯对水热法制备的Zn_2SnO_4进行改性。通过透射电镜(TEM)观察其形貌特征,通过X射线衍射(XRD)、红外光谱(FTIR)、拉曼光谱(Raman)以及X射线光电子能谱(XPS)分析其结构和组成。采用紫外-可见光分光光度计检测石墨烯/Zn_2SnO_4催化降解亚甲基蓝(MB)性能。通过添加自由基捕获剂的光催化实验、电子顺磁共振谱和荧光光谱检测分析石墨烯/Zn_2SnO_4降解MB的光催化机理。通过光催化重复性实验对石墨烯/Zn_2SnO_4的稳定性进行评估。结果表明:加入石墨烯不会对Zn_2SnO_4的结构形貌产生较大影响;当氧化石墨烯(GO)添加量为4 Wt%时,石墨烯/Zn_2SnO_4的光催化活性最高的;光催化过程中·OH是主要的活性物质,存在·OH间接氧化有机污染物的机制。
Semiconductor photocatalytic oxidation technology has a very wide application in dealing with energy crisis and environmental pollution problems.In thispaper,the grapheme was used to modify Zn 2SnO 4 prepared by hydrothermal method.The structure characteristics of grapheme/Zn 2SnO 4 were investigated by X-ray diffraction(XRD),Infrared spectroscopy(FT-IR)and Raman spectroscopy.The transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy were used to observe its morphology and analyze chemical composition,respectively.The photocatalytic performance of graphene/Zn 2SnO 4 photocatalyticdegradation of methylene blue(MB)under UV irradiation was investigated by UV-Vis spectrophotometer.The photocatalytic mechanism of degradation of MB wasdicussed by photocatalytic experiment with free radical scavenger,electron paramagnetic resonance spectrum and fluorescence spectrum.The stability of the photocatalyst was evaluatedby repetitive photocatalytic experiments.The resultsshowed that the addition of graphene had no influence on the structure and morphology of Zn 2SnO 4.And when the additive amount of Graphene oxide(GO)is 4Wt%,the grapheme/Zn 2SnO 4 can exhibited the highest photocatalytic activity.During the photocatalytic process,·OH was the dominant photooxidant,and there was indirect reaction between·OH and organic chemical dyes.
作者
薛娟琴
代继哲
王真星
李迪
XUE Juan-qin;DAI Ji-zhe;WANG Zhen-xing;LI Di(College of Metallurgical Engineering,Xi'an University of Architecture andTechnology,Xi'an 710055,China;College of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2018年第4期1219-1224,共6页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(51478379
51278407)
国家自然科学基金青年科学基金项目(21301135)资助
关键词
石墨烯
锡酸锌
光谱特性
亚甲基蓝
光催化
羟基自由基
Graphene
Zn2SnO4
Spectral characteristic
Methylene blue
Photocatalysis
Hydroxyl radical
