氧化石墨烯电催化高效降解有机染料RBk5

Electrocatalytic degradation of organic dye RBk5by oxide graphene

电化学高级氧化技术是处理有机染料废水的有效技术方法之一,但其应用受传统贵金属电极成本高、易毒化失活等缺陷的限制.本研究采用廉价易得的石墨粉材料,制备氧化石墨烯(GO)催化剂,用于活性黑5(RBk5)染料废水的电催化氧化降解研究.利用透射电子显微镜、X射线光电子能谱、红外光谱、拉曼光谱、循环伏安法和电化学阻抗谱分析材料的结构特性及电化学性能.结果显示,氧化石墨烯具有较高的电子迁移速率,良好的亲水性和电催化活性.不同的RBk5浓度、外加电流、电解质、初始pH值等条件对RBk5的降解效率也有一定程度的影响.其中,电解质因素对材料性能影响最为显著.在RBk5浓度为10mg/L、外加电流为20mA、反应时间为35min、电解质为NaCl的条件下,电催化降解效率可以达到100%.

Advanced electrochemical oxidation is one technical method for organic dye wastewater treatment,its application is limited by the high cost,easy toxicity and deactivation of noble metal electrode.Therefore,the cheap and easily prepared Graphene oxide(GO)instead of Graphene(GN)was used for the reactive black 5(RBk5)dye electrocatalytic degradation.The structure and electrochemical properties of the prepared material was analyzed by transmission electron microscopic(TEM),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared(FTIR),Raman spectroscopy,cyclic voltammetry(CV),and electrochemical impedance spectra(EIS).It was indicated that the GO had high electronic transfer rate,excellent hydrophilicity and electrocatalytic activity.Effects of various factors such as different concentration of RBk5,applied current,electrolyte and initial pH were evaluated and investigated.The results showed that the electrolyte had a great influence on the material performance.The removal rate of RBk5could reach 100% under the conditions of RBk5concentration of 10mg/L,applied current of 20mA,reaction time of 35min and NaCl as electrolyte.