摘要
采用溶胶-凝胶法制备了多壁碳纳米管(MWCNTs)负载的ITO/MWCNTs-TiO2/ITO复合器件,利用SEM、XPS、UV-Vis光谱等技术对复合样品进行形貌和结构表征,以液相罗丹明B(RhB)的可见光光催化降解为探针反应,评价MWCNTs-TiO2复合薄膜的催化活性.XPS结果表明MWCNTs与TiO2之间没有形成Ti-C键.I-V特性表明负载了MWCNTs的ITO/MWCNTs-TiO2/ITO复合器件的光电流增强.与空白TiO2薄膜相比,MWCNTs-TiO2复合薄膜的可见光光催化降解RhB的速率提高了3.2倍.MWCNTs并没有掺杂到TiO2晶格中,而是起到了类似光敏剂的作用,可在可见光激发下将导带电子转移到TiO导带上,经一系列反应降解RhB有机物.
Multi-walled carbon nanotubes（MWCNTs） and TiO2 composite catalysts device-ITO/MWCNTs-TiO2/ITO,was prepared by a sol-gel method coated on indium tin oxide（ITO） substrate.The surface morphology and properties of devices were characterized by SEM,XPS and UV-Vis spectrophotometer.We employed photocatalytic degradation of rhodamine B（RhB） under visible light irradiation as the probe reaction to evaluate its photocatalytic activity.The XPS spectra indicated that Ti-C structures did not form between MWCNTs and TiO2.The linear scan voltammograms（I-V curves） showed that the ITO/MWCNTs-TiO2/ITO exhibited better photoresponse of visible light than the blank device ITO/TiO2/ITO.For photocatalytic degradation of RhB under visible light irradiation,ITO/MWCNTs-TiO2/ITO exhibited better activity,presented 4.2 times of the ITO/TiO2/ITO.The MWCNTs did not substitute O ions in the TiO2 lattice,but served as a photosensitizer.The photoelectrons generated in the CB of MWCNTs could transfer to the CB of TiO2,and the resulting reactive oxygen species could further attack RhB to make it degrade.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2010年第6期537-541,共5页
Journal of Molecular Catalysis(China)
基金
国家重点基础研究发展计划(973计划)(2002CB410802)
国家自然科学基金(20407002)
环境模拟与污染控制国家重点联合实验室(北京大学)专项基金
关键词
二氧化钛
多壁碳纳米管
可见光
光催化
罗丹明B
Titanium dioxide
Multi-wall carbon nanotubes
Visible-light
Photocatalysis
Rhodamine B
