通过水热法合成复合金属氧化物SnO2/Fe3O4粒子电极,然后采用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、磁滞回线等技术分别对粒子电极的晶体组分、形貌、元素组成和分子结构以及粒子电极的磁性特征进行表征.采用循环伏安法分析了三维电极系统的电化学性能,并进行了电催化氧化降解罗丹明B(RhB)的实验.结果表明,SnO2/Fe3O4 粒子电极负载稳定、导电性强、便于回收再利用,有利于电催化氧化降解反应.三维电极降解罗丹明B的析氧电流高于其他电极体系,电催化活性效果明显,90 min内罗丹明B的降解率为100%、TOC去除率为83%,反应中产生的·OH是降解有机物的主要活性基.粒子电极在重复利用5次的情况下,对罗丹明B的降解率仍保持93%以上、TOC去除率保持在77%以上,具有稳定的电催化性能.
SnO2/Fe3O4 particle electrodes with good magnetic properties were prepared by a hydrothermal method.The morphology, crystal phase composition and magnetic properties of the electrodes were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and hysteresis testing, respectively.The electrocatalytic property was investigated by cyclic voltammetry, and the electrochemical degradation of artificial Rhodamine B (RhB) waste water was conducted in a multi-electrode reactor.Results showed that the catalytic layer of the as-prepared particle electrode had stable load and good conduction, and was easy to recycle and reuse, which benefit the electrocatalytic reaction.The multi-electrode system was far better at degrading RhB than a two-dimensional electrode system, as the former′s removal rate of RhB and total organic carbon (TOC) were 100% and 83%, respectively.In the reaction,·OH is the main active radical for the degradation of organic compounds.Moreover, the removal rate of RhB and total organic carbon (TOC) maintained above 93% and 77%, respectively, after the particle electrode were reused 5 times, exhibiting an excellent and stable electrocatalytic performance.
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