Electrocatalytic Oxidation of Low Concentration Cefotaxime Sodium Wastewater Using Ti/Sno2-Ruo2 Electrode : Feasibility Analysis and Degradation Mechanism

In this research, green and sustainable electrocatalytic oxidation technology was applied to decompose low concentration cefotaxime sodium (CFX). The feasibility of electrocatalytic oxidation process and the characteristics of Ti/SnO2-RuO2 coating electrode were introduced in detail. In order to save resources, the effects of current density, initial concentration, pH, electrolyte concentration, and other technological parameters on the degradation efficiency were discussed. Orthogonal experiment results indicated that when the current density of 25 mA/cm2, concentration of electrolyte was 5 mM, the pH value of 7, removed the best effect. At this time, the CFX removal rate was 86.33%. Polarization curve results showed that Ti/SnO2-RuO2 electrodes had excellent performance, saving energy consumption to a certain extent, and effectively alleviating the economic applicability. High-performance liquid chromatography (HPLC) was used to determine the content of cefotaxime sodium. Fourier transform infrared spectroscopy (FTIR) was used to analyze the different inlet and outlet stages before and after the degradation of CFX, and the possible degradation process was given. Ultimately, the electrocatalytic oxidation of Ti/SnO2-RuO2 electrode was a clean and efficient technology, which could be widely used in the treatment of CFX wastewater