Construction of oxygen defective ZnO/ZnFe_(2)O_(4) yolk-shell composite with photothermal effect for tetracycline degradation:Performance and mechanism insight  

作　　者：Ke Zhang Hongyang Cao Afzal Dar Danqing Li Lina Zhou Chuanyi Wang 

机构地区：[1]School of Environmental Science and Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China

出　　处：《Chinese Chemical Letters》2023年第1期452-456,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21976116,52161145409);Shaanxi Provincial Foreign Expert Project(No.2021JZY-004);SAFEA of China(Highend Foreign Expert Project);Alexander-von-Humboldt Foundation of Germany(Group-Linkage Program);the scientific research startup fund of Shaanxi University of Science and Technology。

摘　　要：Oxygen vacancy induced photothermal effect is of great significant but lack of adequate attentions for environmental remediation.In this paper,green recyclable ZnO/ZnFe_(2)O_(4) with oxygen vacancy was prepared by a solvothermal-calcination method.The UV-vis light capture ability of ZnO/ZnFe_(2)O_(4) microspheres is improved with the multiple light reflections due to the yolk-shell structure,and the oxygen vacancy expands the absorption range of photocatalyst and enhances photothermal conversion.The optimized photocatalyst can heat the solution from room temperature to 70°C within 60 min of visible light illumination,and the light to heat conversion efficiency is achieved by 61.3%.Compared with the degradation efficiency at 20°C,photothermal catalysis achieves a stable degradation in 80 min,and the degradation efficiency is increased by 41.5%.This can be attributed to the fact that light induced thermal energy accelerates the migration of electrons and holes,and promotes the diffusion of free radicals by heating active centers in situ.The active species contributing to the degradation,in order of importance,are the superoxide radical,hydroxyl radical,hole and electron.The light-to-thermal assisted photocatalysis with ZnO/ZnFe_(2)O_(4) provides a new sight for the pollution control in the future practical applications.

关 键 词：PHOTOCATALYSIS PHOTOTHERMAL Oxygen vacancy Yolk-shell TETRACYCLINE 

分 类 号：TB33[一般工业技术—材料科学与工程]