Co_(3)O_(4)掺杂SnO_(2)-Sb导电固溶体电致^(1)O_(2)强氧化剂降解罗丹明B性能

Performance of Strong Oxidant^(1)O_(2)Produced by Water Electrolysis with SnO_(2)-Sb Conductive Solid Solution Doped with Co_(3)O_(4)for Degradation of Rhodamine B

【目的】降解印染废水阳极材料降解效率低,产业化进程慢。【方法】采用多次浸渍-热分解法制备了不同Co_(3)O_(4)掺杂量SnO_(2)-Sb-Co_(3)O_(4)@GF纳米复合电极材料,通过扫描电镜(SEM)、X射线衍射仪(XRD)、X射线光电子能谱(XPS)对其形貌、晶相、表面元素进行表征,化学捕获剂法鉴别电致自由基。【结果】Co_(3)O_(4)均匀掺杂至SnO_(2)-Sb固溶体,并在碳纤维表面形成纳米微晶薄层,其中SnO_(2)-Sb-Co1%@GF晶粒粒径较小,分布均匀致密;该电极在电解Na_(2)SO_(4)水溶液过程中释放大量·OH、SO_(4)^(·-)、·O_(2)^(-)和^(1)O_(2)等强氧化性自由基,其中^(1)O_(2)对废水中RhB的降解起到较为重要的作用。【结论】线性扫描伏安、循环伏安、交流阻抗等电化学性能表征显示,该电极具有最高的交换电流密度、伏安电荷、电化学活性面积和较低的交流阻抗,显示出较突出的电解水的催化活性。

【Purposes】The low degradation efficiency of anode materials in printing and dyeing wastewater has led to low industrialization process.【Methods】SnO_(2)-Sb-Co_(3)O_(4)@GF nanocomposite electrode materials with different Co_(3)O_(4)doping contents were prepared by multiple dipping and thermal decomposition method.The morphology,crystal phase,and surface elements of nanocomposites were characterized by scanning electron microscopy,X-ray diffraction,and X-ray photoelectron spectroscopy.The free radicals produced by electrolysis of water were identified by chemical trapping agent method.【Findings】The results show that Co_(3)O_(4)was uniformly doped into SnO_(2)-Sb solid solution,and a nanocrystalline thin layer was formed on the surface of carbon fiber.Among all prepared electrodes,SnO_(2)-Sb-Co1%@GF exhibited small,uniformly distribu-ted,and dense particle size;During the electrolysis of Na_(2)SO_(4)aqueous solution,the electrode re-leases a large number of strong oxidizing free radicald such as·OH,SO_(4)^(·-),·O_(2)^(-),and^(1)O_(2),in which^(1)O_(2)plays an important role in the degradation of rhodamine B(RhB)in wastewater.【Conclusions】The electrochemical characterizations of linear sweep voltammetry,cyclic voltam-metry,and AC impedance show that the electrode had the highest exchange current density,vol-tammetric charge,electrochemical active area,and low AC impedance,showing outstanding cat-alytic activity of water electrolysis.