MoS_(2)/F-TiO_(2)异质结的制备及光降解罗丹明B性能研究  

Study on preparation of MoS_(2)/F-TiO_(2)heterojunction and its photodegradation performance on rhodamine B

作　　者：刘敏[1,2,3] 王碧玉 韩炎霖 邱晓虹 刘洪材 徐先念 张理元 LIU Min;WANG Biyu;HAN Yanlin;QIU Xiaohong;LIU Hongcai;XU Xiannian;ZHANG Liyuan(College of Chemistry and Chemical Engineering,Neijiang Normal University,Neijiang,641112,China;Key Laboratory of Fruit Waste Treatment and Resource Recycling of the Sichuan Provincial College,Neijiang,641112,China;Special Agricultural Resources in Tuojiang River Basin Sharing and Service Platform of Sichuan Province,Neijiang,641112,China)

机构地区：[1]内江师范学院化学化工学院,内江641112 [2]果类废弃物资源化四川省高等学校重点实验室,内江641112 [3]沱江流域特色农业资源四川省科技资源共享服务平台,内江641112

出　　处：《环境化学》2024年第5期1693-1706,共14页Environmental Chemistry

基　　金：四川省科技计划项目(2023YFG0247);内江师范学院大学生创新项目(X2023260)资助.

摘　　要：构建异质结型光催化剂是提高半导体光催化性能的有效方法之一,同时也是光催化处理有机废水的重要技术策略.采用沉淀胶溶法制备出F-TiO_(2),并与MoS_(2)复合构建兼具吸附-光催化性能的MoS_(2)/FTiO_(2)异质结.采用扫描电子显微镜(SEM)、比表面积分析仪(BET)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、紫可见吸收光谱(UV-Vis-Abs)、X射线光电子能谱仪(XPS)等技术分别对MoS_(2)/FTiO_(2)复合材料进行表征,研究了MoS_(2)/F-TiO_(2)的光催化性能.结果表明,1.0%MoS_(2)/F-TiO_(2)在降解有机污染物罗丹明B(RhB)溶液过程中表现出优异的光催化活性和稳定性.MoS_(2)和F-TiO_(2)形成异质结催化剂有效抑制光生载流子复合,提高光生电子和空穴分离率和寿命,从而产生更多羟基自由基和超氧自由基以提高光催化效率;并且1.0%MoS_(2)/F-TiO_(2)异质结具有较大的比表面积,可增加催化反应的活性位点和有机物在材料表面的吸附,使其35 min后降解率高达95.73%,显著高于纯TiO_(2)和F-TiO_(2).此外,MoS_(2)/FTiO_(2)复合材料具有良好的循环稳定性,经过5次重复降解测试,其对RhB的降解率仍保持在90%以上.Constructing heterojunction photocatalysts is one of the effective methods to improve the photocatalytic performance of semiconductors,and is also an important strategy for photocatalytic treatment of organic wastewater.F-TiO_(2)was prepared by the precipitation-peptization method,followed by coupling with MoS_(2)to construct a MoS_(2)/F-TiO_(2)heterojunction with the integrated adsorption-photocatalysis performance.Scanning electron microscope(SEM),specific surface area analyzer(BET),X-ray diffractometer(XRD),fourier transform infrared spectrometer(FTIR),ultraviolet visible absorption spectrum(UV-Vis-Abs)and X-ray photoelectron spectroscopy(XPS)were used to characterize the obtained composites,and the photocatalytic activity of MoS_(2)/F-TiO_(2)heterojunction was investigated.The results show that 1.0%MoS_(2)/F-TiO_(2)exhibit excellent photocatalytic activity and stability in the degradation of organic pollutant Rhodamine B(RhB)solution.The heterojunction catalyst formed by MoS_(2)and F-TiO_(2)effectively inhibits the recombination of photo generated charge carriers,improves the separation rate and lifetime of photo generated electrons and holes,and generates more hydroxyl and superoxide radicals to improve photocatalytic efficiency.1.0%MoS_(2)/F-TiO_(2)heterojunction has a large specific surface area,which can increase the active sites of catalytic reactions and the adsorption of organic compounds on the material surface,resulting in a degradation rate of 95.73%after 35 min,significantly higher than pure TiO_(2)and F-TiO_(2).In addition,MoS_(2)/F-TiO_(2)composites have a good cyclic stability,and the degradation rate of RhB still remains above 90%after 5 repeated degradation tests.

关 键 词：F-TiO_(2) MoS_(2) 异质结 有机染料 吸附-光催化 

分 类 号：X-1[环境科学与工程] O6[理学—化学]