MoS2/F-TiO2异质结的制备及光降解罗丹明B性能研究
Study on preparation of MoS2/F-TiO2 heterojunction and its photodegradation performance on rhodamine B
刘敏 1王碧玉 2韩炎霖 2邱晓虹 2刘洪材 2徐先念 2张理元1
作者信息
- 1. 内江师范学院化学化工学院,内江,641112;果类废弃物资源化四川省高等学校重点实验室,内江,641112;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
- 2. 内江师范学院化学化工学院,内江,641112
- 折叠
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-TiO2,并与MoS2复合构建兼具吸附-光催化性能的MoS2/F-TiO2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MoS2/F-TiO2复合材料进行表征,研究了 MoS2/F-TiO2的光催化性能.结果表明,1.0％MoS2/F-TiO2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.MoS2和F-TiO2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％MoS2/F-TiO2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TiO2和F-TiO2.此外,MoS2/F-TiO2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.
Abstract
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-TiO2 was prepared by the precipitation-peptization method,followed by coupling with MoS2 to construct a MoS2/F-TiO2 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 MoS2/F-TiO2 heterojunction was investigated.The results show that 1.0％MoS2/F-TiO2 exhibit excellent photocatalytic activity and stability in the degradation of organic pollutant Rhodamine B(RhB)solution.The heterojunction catalyst formed by MoS2 and F-TiO2 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％MoS2/F-TiO2 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 TiO2 and F-TiO2.In addition,MoS2/F-TiO2 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-TiO2/MoS2/异质结/有机染料/吸附-光催化Key words
F-TiO2/MoS2/heterojunction/organic dye/adsorption-photocatalysis引用本文复制引用
基金项目
四川省科技计划(2023YFG0247)
内江师范学院大学生创新项目(X2023260)
出版年
2024
NETL
NSTL
万方数据