摘要
本研究采用阳极氧化法在金属钛箔上制备TiO2纳米管阵列,并用直流电沉积在退火后的TiO2纳米管内部填充CdS。用扫描电子显微镜(SEM)及电子能谱(EDS)、X射线衍射(XRD)对TiO2/CdS异质结进行表征,结果显示,TiO2/CdS同轴核壳结构有序规整排列,孔径大小均一,Cd、S两种元素化学配比接近1:1。450℃空气退火后的TiO2是锐钛矿型,沉积的CdS为六方相。对TiO2纳米管和TiO2/CdS异质结分别进行了紫外–可见吸收光谱和紫外光下光催化降解甲基橙染料的性能测试。结果表明,复合后TiO2的吸收边出现了明显的红移;TiO2/CdS催化降解甲基橙的降解率最高达99.4%,与纯TiO2相比TiO2/CdS的光催化活性明显提高。
TiO2 nanotube arrays on titanium sheet were prepared by anodized oxidation method and filled with CdS in the interior of the annealed TiO2 nanotubes by direction current（DC） electrodeposition.The TiO2/CdS heterojunctions were characterized through scanning electron microscopy（SEM）,energy dispersive spectrometer（EDS） and X-Ray diffraction（XRD）.The results show that TiO2/CdS coaxial nanocables are orderly arrayed,their diameters are uniform and the chemical ratio of Cd and S is closed to 1：1.The TiO2 annealed at 450℃ in air is anatase and the deposited CdS is hexagonal phase.UV-visible absorption spectroscopy and methyl orange dye by photocatalytic degradation under UV light of the pure TiO2 nanotubes and TiO2/CdS heterojunction are investigated.Compared with the pure TiO2,TiO2/CdS heterojunction has an obvious red-shift on the edge of TiO2 absorption and their photocatalytic activity is obviously improved,with maximum degradation rate of methyl orange as 99.4%.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第4期431-435,共5页
Journal of Inorganic Materials
关键词
二氧化钛
硫化镉
异质结
电沉积
光催化
titanium dioxide
cadmium sulfide
heterojunction
electrodeposition
photocatalysis
