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

摘要

为了改善传统电-芬顿阴极材料催化能力有限,Fe2+的再生困难,电流密度低,应用p H 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 30 min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 H2O2,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 Fe2+,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 (FT-IR).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 electro-Fenton 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 H2O2effectively and accelerate the generation of ·OH. The electro-Fenton degradation efficiency has been improved greatly.