MnOx掺杂纳米石墨阴极制备及其催化降解能力

采用溶胶-凝胶法和热压法制备锰氧化物掺杂的纳米石墨(Nano-G)电极（MnOx/Nano-G电极），并以其为工作电极，构建了能够高效处理水中盐酸四环素（tetracycline hydroxhloride, TCH）的阴极电芬顿体系。运用SEM、XRD、XPS、循环伏安测试和电化学阻抗测试等对MnOx/Nano-G电极进行表征。研究结果表明，MnOx的掺杂可以明显提高Nano-G电极的导电性、电化学稳定性和电化学活性，从而大幅提升阴极电芬顿处理TCH的效能。在TCH初始浓度为20 mg?L-1、电流密度为30 mA?cm-2、初始pH为5.0、极板距离为10mm时，TCH的降解效果最佳；反应60min后，59.27%的TCH被有效去除，相较于未改性的Nano-G电极，TCH降解效率提高了18.70%。此外，MnOx/Nano-G的阴极电芬顿体系的处理效能明显高于传统的RuO2-IrO2/Ti和钛网阴极。综上，MnOx/Nano-G的阴极电芬顿体系是一种高效且具有应用前景的TCH处理技术。

Preparation of Nano graphite cathode doped with MnOx and degradation of tetracycline hydrochloride

A cathodic electro-Fenton system capable of efficiently treating tetracycline hydrochloride (TCH) in water was built by preparing a manganese oxide doped nano-graphite (Nano-G) electrode (MnOx/Nano-G electrode) and using it as the working electrode using the sol-gel and hot-pressing methods. The MnOx/Nano-G electrode was characterized by SEM, XRD, XPS, cyclic voltammetry and electrochemical impedance tests. The results demonstrated that MnOx doping could significantly improve the electrical conductivity, electrochemical stability and electrochemical activity of the Nano-G electrode, thereby improving the efficacy of cathodic electro-Fenton treatment of TCH. The best TCH degradation effect was achieved at an initial TCH concentration of 20 mg?L-1, current density of 30 mA?cm-2, initial pH of 5.0 and electrode plate distance of 10 mm. After 60 minutes, 59.27 percent of TCH had been effectively removed, and the TCH degradation efficiency had increased by 18.70 percent when compared to the unmodified Nano-G electrode. Furthermore, the cathodic electro-Fenton system of MnOx/Nano-G had a significantly higher treatment efficiency than the conventional RuO2-IrO2/Ti cathode and titanium mesh cathode. Results indicate that the cathodic electro-Fenton system of MnOx/Nano-G is an efficient and promising technology for TCH treatment.