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研究报告

廖蓉,王中琪,汪迎春,王军,杨鹏,杨敏.改性Ti/SnO₂-Sb电极催化降解1,4-二氯苯废水试验研究[J].环境科学学报,2016,36(3):850-856

The modification of modified Ti/SnO₂-Sb electrode for electrochemical catalytic degradation of 1,4-dichlorobenzene

摘要：采用聚合物前驱体法制备了未掺杂、掺杂Cu、掺杂Bi、掺杂Ni的4种Ti/SnO₂-Sb电极,运用SEM和XRD分析电极表面形貌及结构,通过线性极化扫描、循环伏安等测试考察其电化学性能,同时进行1,4二氯苯(p-DCB)降解实验进一步探究电极的电催化氧化特性.SEM和XRD结果表明,掺杂金属可改善电极表面形貌,增大其比表面积;电化学测试表明,Ti/SnO₂-Sb电极的析氧电位并未因金属掺杂而有明显改变,掺杂金属后,Ti/SnO₂-Sb电极具有更优的电催化活性和稳定性.p-DCB降解实验表明,改性Ti/SnO₂-Sb电极对p-DCB的降解效率明显提高,其中Ti/SnO₂-Sb-Cu电极的电催化处理效果最优,电解2 h后p-DCB的去除率即达到87.6%,且p-DCB的降解反应遵循一级反应动力学规律.

Abstract：The Ti/SnO₂-Sb electrodes modified with Cu, Bi and Ni elements were prepared with the polymeric precursor process. The morphology and structure of the electrodes were characterized by scanning electron microscope (SEM) and X-Ray Diffraction (XRD), respectively. Then, the electro-chemical properties of the electrodes were evaluated by liner sweep voltammetry (LSV) and cyclic voltammetry (CV). Meanwhile, the degradation experiments of 1,4-dichlorobenzene (p-DCB) were carried out to further explore the electro-catalytic characteristics of electrodes. SEM images and XRD patterns show that the electrodes modified with the metals improved the surface morphology and surface area themselves. However, the oxygen evolution potential of Ti/SnO₂-Sb electrode was unchanged, and the modified electrodes exhibited better electro-catalytic activity and stability compared with unmodified electrodes. Interestingly, it is revealed that the degradation efficiency of p-DCB significantly increased owing to the modified electrodes. Among them, the Ti/SnO₂-Sb-Cu electrode had the best electro-catalytic performance, and the removal rate of p-DCB is up to 87.6% during the first 2 hours. Besides, the degradation process of p-DCB was consistent with the first-order kinetics model.

Key words：Ti/SnO₂-Sb electrode electro-catalytic oxidation 1,4-dichlorobenzene degradation