摘要
以醋酸锌和乙酰丙酮银为前驱体,通过同轴静电纺丝和热处理过程在氟掺杂氧化锡(FTO)导电玻璃上制备了ZnO/Ag2O同轴纳米纤维。采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、拉曼光谱和紫外-可见漫反射光谱(UV-Vis DRS)等手段对材料进行了表征。以氙灯模拟可见光光源,亚甲基蓝为目标降解物,考察了所制备纳米纤维的光电催化活性。结果表明,同轴ZnO/Ag2O纳米纤维具有壳核类似结构(ZnO为壳,Ag2O为核),Ag2O与ZnO形成的异质结和杂质能级降低了ZnO的带隙能,提高了对可见光的利用率。在可见光下,与纯ZnO相比,ZnO/Ag2O具有很强的光电催化能力,并且Ag2O的量对同轴纤维光电催化活性影响很大,在同样光电催化条件下,ZnO/Ag2O-7同轴纳米纤维的光电催化效果最好,亚甲基蓝降解率达93%,动力学常数最大为1. 13×10^-2min^-1.
ZnO/Ag2O/FTO coaxial nanofibers( FTO: Fluoride-doped tin oxide conductive glass) were prepared by sol-gel process,coaxial electrospinning and heat treatment using zinc acetate and silver acetylacetonate as precursors. The structure and surface morphology of the materials were characterized by X-ray diffraction( XRD),X-ray photoelectron spectroscopy( XPS),scanning electron microscopy( SEM),transmission electron microscopy( TEM),Raman spectroscopy,UV-Visible diffuse-reflective spectroscopy( UV-Vis DRS).At the same time,taking the Xenon lamp as the visible light source for simulation and methylene blue as the degradation target,the photoelectrocatalytic activity of the prepared nanofibers was investigated. The results show that the coaxial ZnO/Ag2O nanofibers have a shell-like structure( Zn O shell,Ag2O core). Ag2O and ZnO form heterojunction and impurity levels,which not only reduces the band gap energy of ZnO,but also improves the utilization of visible light. Compared with pure ZnO,ZnO/Ag2O has stronger photoelectrocatalytic ability under visible light,and the amount of Ag2O has a great influence on the photoelectrocatalytic activity of coaxial fiber. Under the same photoelectric catalytic condition,Zn O/Ag2O-7 displayed the highest photoelectric activity,showing a high degradation rate of 93%,and its maximum kinetic constant is 1. 13×10^-2 min^-1. It is attributed to the lowest recombination rate of photogenerated electron-hole pairs.
作者
韩志英
李佑稷
陈飞台
汤森培
王鹏
HAN Zhiying;LI Youji;CHEN Feitai;TANG Senpei;WANG Peng(Department of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第2期308-316,共9页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21476095)
吉首大学校级科研项目(批准号:Jdy1817)
矿物清洁生产与绿色功能材料开发湖南省重点实验室资助~~
关键词
异质结
同轴纳米纤维
光电催化活性
Heterojunction
Coaxial nanofibers
Photoelectrocatalytic activity
