不同Cu^(+)掺杂量MIL-53(Fe,Cu)的制备及其光芬顿性能

Preparation of MIL-53(Fe,Cu)with different doping contents of Cu^(+)and its photo-Fenton properties

为了探究引入Cu^(+)对MOF材料光芬顿性能影响,采用溶剂热法成功地合成双金属有机框架材料MIL-53(Fe,Cu),通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和电化学阻抗谱(EIS)等对催化剂进行表征,分析掺杂Cu^(+)对MIL-53(Fe)的晶体结构、形貌、光致载流子分离的影响。结果表明:引入Cu^(+)改变了MIL-53(Fe)的部分晶体结构和八面体形貌改变,催化剂表面变得粗糙。同时降低了Fe中心的电子密度,带隙变小,促进电子-空穴对的分离,加速Fe^(2+)/Fe^(3+)循环;光芬顿性能测试显示,Cu^(+)的引入提高了MIL-53(Fe)的降解效率,其中0.3 MIL-53(Fe,Cu)降解速率最快,0.3 MIL-53(Fe,Cu)的反应速率是MIL-53(Fe)的3倍,Vis、H_(2)O_(2)和催化剂相互作用产生的·OH是降解CBZ的主要原因。该双金属MIL-53(Fe,Cu)的制备方法简单,为后续探索高效光芬顿双金属催化剂提供了新思路。

In order to explore the effect of the doping of Cu^(+)on the photo-Fenton properties of MOF material,the bimetallic organic framework material MIL-53(Fe,Cu)was successfully synthesized by solvothermal method,the catalysts were characterized by X-ray diffractometer(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS)and electrochemical impedance spectroscopy(EIS).The effects of the doping of Cu^(+)on the crystal structure,morphology and photo-induced carrier separation of MIL-53(Fe)were analyzed.The results showed that the doping of Cu^(+)changed part of the crystal structure and octahedral morphology of MIL-53(Fe),and the surface of the catalyst became coarse.At the same time,the electron density of Fe center was reduced,and the band gap became smaller,which facilitated the separation of electron-hole pairs,and accelerated the Fe^(2+)/Fe^(3+)cycle.The photo-Fenton property test showed that the doping of Cu^(+)improved the degradation efficiency of MIL-53(Fe),among which the degradation rate of 0.3 MIL-53(Fe,Cu)was the highest,and the reaction rate of 0.3 MIL-53(Fe,Cu)was three times that of MIL-53(Fe).The·OH generated by the interaction of Vis,H_(2)O_(2) and catalyst was the leading cause of the degradation of CBZ.This bimetallic MIL-53(Fe,Cu)was easy to prepare and provided a new train of thought for subsequent exploration of high-efficiency photo-Fenton bimetallic catalysts.