摘要
采用水热法制备了不同石墨烯含量(1%,2%,3%和4%)(质量分数)的TiO_(2)/石墨烯纳米复合材料。通过XRD、SEM、UV-Vis、拉曼光谱和降解效率测试等,对复合材料的物相结构、微观形貌、光学活性、分子结构和催化降解性能等进行了表征。结果表明,4种TiO_(2)/石墨烯纳米复合材料的衍射峰均为标准的锐钛矿型TiO_(2)衍射峰,整体峰值较为尖锐,结晶度较高,随着石墨烯含量的增加,衍射峰的强度降低,峰面积减小,且TiO_(2)的晶相含量减少;随着石墨烯含量的增加,复合材料中石墨烯的片层明显增多,附着在石墨烯表面上的TiO_(2)颗粒显得分散,继续增加墨烯的含量,出现了部分团聚现象,TiO_(2)的颗粒较少;掺入石墨烯后,所有复合材料在可见光区域的吸收强度都得到了明显的增强,从区域面积来看,石墨烯含量越多,复合材料的吸收强度增加得越多,并且在320 nm以上的吸收有红移现象;随着石墨烯含量的增加,复合材料中锐钛矿相TiO_(2)的特征峰呈现出逐渐减弱的趋势;石墨烯的掺入可以显著提高复合材料的催化降解效率,当石墨烯的含量为3%(质量分数)时,复合材料在100 min时催化降解已经达到了平衡状态,降解效率最高达到91%,但当石墨烯的含量再升高时,复合材料对VOCs的催化降解效率出现了降低。
TiO_(2)/graphene nanocomposites with different contents of graphene(1%wt,2 wt%,3 wt%and 4 wt%)are prepared by hydrothermal method.The phase structure,micro morphology,optical activity,molecular structure and catalytic degradation performance of the composites are characterized by XRD,SEM,UV-Vis,Raman spectroscopy and degradation efficiency test.The results show that the diffraction peaks of the four kinds of TiO_(2)/graphene nanocomposites are standard anatase TiO_(2) diffraction peaks,and the overall peak value is sharp and the crystallinity is high.With the increase of graphene content,the intensity and area of diffraction peak decreases,and the crystal phase content of TiO_(2) decreases.With the increase of graphene content,the number of graphene layers in the composites increases significantly,and the TiO_(2) particles attached to the graphene surface are dispersed,and continuing to increase the content of graphene,the particles of TiO_(2) are less.The absorption intensity of all the composites in the visible region is obviously enhanced after doping grapheme.From the regional area,the more graphene content,the more the absorption intensity of the composite increases,and the absorption above 320 nm has a red shift.With the increase of graphene content,the characteristic peaks of anatase TiO_(2) in the composites show a decreasing trend.The addition of graphene could significantly improve the catalytic degradation efficiency of the composites,when the content of graphene is 3 wt%,the catalytic degradation of the composite reaches equilibrium state in 100 min,and the highest degradation efficiency reaches 91%.However,when the content of graphene increases,the catalytic degradation efficiency of VOCs decreases.
作者
刘科
LIU Ke(Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices,Xiangyang 441053,China;School of Physics and Electronic Engineering,Hubei University of Arts and Science,Xiangyang 441053,China)
出处
《功能材料》
CAS
CSCD
北大核心
2021年第10期10207-10211,共5页
Journal of Functional Materials
基金
湖北省教育厅科学研究资助项目(B2019139)
湖北文理学院学科开放基金资助项目(XK2020045)。
