SnO2-Sb/碳纳米管复合电极的制备及催化降解低浓度头孢他啶

Fabrication of SnO2-Sb/MWCNTs composite electrode and the anodic degradation of low concentration ceftazidime

利用溶胶凝胶法制备了SnO2-Sb掺杂碳纳米管复合材料,采用热压法将其固定在不锈钢网上制成平面二维电极,借助SEM、XRD对其形貌、微观结构及元素结构进行分析,通过循环伏安曲线(CV)、极化曲线(Tafel),线性伏安(LVS)对其电化学性质进行了表征.结果显示,锡锑金属均匀地负载到了碳纳米管上且具有良好的电催化活性和稳定性,金属的掺杂使得碳纳米管电极具有更高的析氧电位和更小的阻抗.使用荧光光谱法测试了羟基自由基的产生能力,通过循环5次降解实验验证了电极的稳定性.降解实验表明,SnO2-Sb/碳纳米管电极对低浓度头孢他啶具有很高的降解效率,在2 mA·cm^-2的电流强度下,60 min内可以达到90%的去除率.最后,针对不同的电解质和电流强度对电催化降解效率的影响,也通过实验数据进行了分析.

SnO2-Sb/MWCNTs composites were prepared through sol-gel method, and were hot-pressed onto stainless steel mesh to form a 2-D electrode. Scanning electron microscopy(SEM), X-ray diffraction(XRD) and electrochemical measurements were used to investigate the morphology, phase composition and electrochemical performance. It was demonstrated that SnSbOx was successfully doped onto MWCNTs. Oxygen evolution potential, electrocatalytic activity and stability were substantially improved. Enhanced hydroxyl radical production capability was tested by fluorescence spectrometry method. Service life test was conducted with five cycles of electrochemical degradation of ceftazidime. The results demonstrated that SnO2-Sb/MWCNTs electrode could reach a 90% removal rate after 60 min under a current density of 2 mA·cm^-2.