铜掺杂石墨烯气凝胶的制备、表征及在电-芬顿体系中的应用

Copper Doped Graphene Aerogel:Synthesis,Characterization and Application in Eletro-Fenton

为了改善传统电-芬顿阴极材料催化能力有限,Fe^(2+)的再生困难,电流密度低,应用pH值范围窄等问题,文中以石墨烯气凝胶为基体将其与Cu金属掺杂负载,采用自然干燥法制得铜掺杂石墨烯气凝胶(Cu-GA).通过扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)等对铜掺杂石墨烯气凝胶进行结构及形貌表征,利用热重分析(TG)测定其热稳定性,并且采用电化学工作站对其进行电化学性能测试.为了检测铜掺杂石墨烯气凝胶的催化性能,将其作为阴极材料用于电-芬顿体系中降解罗丹明B模拟染料废水.实验结果表明,在最佳pH=3的条件下,降解罗丹明B 30min后,降解率高达97%,且COD去除率达到84%.结果表明铜掺杂石墨烯气凝胶结构稳定,能够高效氧化降解有机污染物,这是由于Cu+的引入能够有效催化分解H_2O_2,加速·OH的产生,有效地提高了电-芬顿降解效率.

The study aims to solve the problems of the limited catalytic ability of the traditional electro-Fenton cathode materials,difficult regeneration of Fe^2＋,low current density and narrow pH range.With graphene aerogel as the matrix,Cu doped graphene aerogel（Cu-GA）was prepared by the natural drying method.Its morphology and components were characterized by Scanning electron microscopy（SEM）,scanning electron microscopy（SEM）,X-ray diffraction（XRD）and Fourier transform infrared spectroscopy（FTIR）.Its thermal stability was determined by thermal analysis（TG）,and its electrochemical properties were investigated by electrochemical workstation.In order to test its catalytic performance in electroFenton system,Cu doped graphene aerogel was used as the cathode material to degrade dye wastewater simulated with rhodamine B（RhB）.It was found that the degradation rate was 97%and the removal rate of COD reached 84% after 30 min degradation of Rhodamine B under the optimum pH=3.The results show that Cu doped graphene aerogel has stable structure and can degrade RhB effectively because the introduction of Cu^＋can catalyze and decompose H2O2 effectively and accelerate the generation of·OH.The electro-Fenton degradation efficiency has been improved greatly.