Co-PbO_(2)电极电催化氧化SMX的降解研究

Degradation of Sulfamethoxazole by Electrochemical Oxidation with Co-PbO_(2) Electrode

作者采用电沉积法成功制备了Co掺杂改性Ti/TiO_(2)NTs/Co-PbO_(2)电极,通过SEM、XRD、XPS对其表面形貌、晶体结构和元素组成进行了表征。通过对比Ti/TiO_(2)NTs/Co-PbO_(2)电极在不同水质中电催化降解磺胺甲啊恶唑(SMX)的效果,分析发现该电极具有良好的电催化性能。探究了天然水基质对SMX降解的影响,发现水体中常见的无机阴离子Cl^(-)和HCO_(3)^(-)/CO_(3)^(2-)能够促进SMX的降解,而腐殖酸抑制SMX的降解。通过LC-MS对SMX及中间体产物进行鉴定,分析出其可能的降解路径有硝化、酰化、羟基化和S-N键直接断裂。

A prospective Ti/TiO_(2)NTs/Co-PbO_(2)electrode has been successfully manufactured for the degradation of sulfamethoxazole(SMX).And the surface morphology,crystal structure and elemental states were characterized by SEM,XRD and XPS.By comparing the effect of Ti/TiO_(2)NTs/Co-PbO_(2)electrode on electrocatalytic degradation of SMX in different water quality,the electrode has a good electrocatalytic performance.The effects of natural water substrates on the degradation of SMX were investigated.It was found that the inorganic anions Cl^(-)and HCO_(3)^(-)/CO_(3)^(2-)could promote the degradation of SMX,while humic acid(HA)inhibited the degradation of SMX.The main intermediate products of SMX were identified by using LC-MS,and the possible degradation pathways mainly analyzed including nitration,acylation,hydroxylation,coupling and S-N bond cleavage.