石墨烯三维电极-电Fenton系统降解甲基橙

将三维电极和电Fenton系统结合电催化氧化降解甲基橙废水.制备了Fe₃O₄负载的氧化石墨烯粒子电极GO@Fe₃O₄（GF）和球形凝胶结构SA/GO@Fe₃O₄（SGF）粒子电极，对两种粒子电极进行了表征，探讨了三维电极-电Fenton（3D-EF）系统电催化氧化性能的影响因素，并进行了反应动力学分析，结合Box-Benhnken中心复合响应面设计建立响应面二次多元回归方程模型；采用紫外可见光谱和GC-MS技术研究甲基橙降解过程.结果表明，SGF粒子电极表面形成三维网络状褶皱结构.在初始pH=5，粒子电极投加量3.0g/L，反应时间90min，电流密度30mA/cm²，外加电压7V的反应条件下，SGF粒子电极体系的甲基橙色度和COD去除率分别是98.8%和87.5%，均高于GF粒子电极体系的甲基橙色度去除率87.2%和COD去除率71.2%.响应面模型预测的反应条件和甲基橙色度去除率和实验结果吻合.推测甲基橙降解过程分为3个阶段：断键氧化过程、开环过程和完全氧化过程.

Degradation of methyl orange by graphene three-dimensional electrode-electro Fenton system

Three-dimensional electrode and electric Fenton system were combined to degrade methyl orange wastewater with the method of electrocatalytic oxidation degradation. Fe₃O₄ loaded graphene oxide particle electrode GO@Fe₃O₄ (GF) and spherical gel structure SA/GO@Fe₃O₄ (SGF) particle electrode were made by our research group. Then, the two kinds of particle electrodes were characterized, the influence factors of electrocatalytic oxidation performance by three-dimensional electrode-electro Fenton (3D-EF) system were discussed and the reaction kinetic analysis was carried out. Based on the design of Box-Benhnken central composite response surface, the response surface quadratic multiple regression equation model was established. The degradation process of methyl orange was studied by UV-vis and GC-MS. There was three-dimensional network fold structure on the surface of SGF particle electrode. Under the reaction conditions, namely initial pH=5, particle electrode dosage 3.0g/L, reaction time 90min, current density 30mA/cm²and applied voltage 7V, the removal efficiencies of methyl orange chromaticity and COD of SGF particle electrode system were 98.8% and 87.5% respectively, which were higher than that of GF particle electrode system, which were 87.2% and 71.2% respectively. Based on the present study, the reaction conditions and the removal efficiency of methyl orange chromaticity predicted by the response surface model were consistent with the experimental results. The speculated degradation process of methyl orange can be divided into three stages:bond breaking oxidation process, ring opening process and complete oxidation process.