AbstractIn this study, a zero‐gap flow‐through microfluidic reactor was constructed for the degradation of tetracycline and norfloxacin in water using a porous Ti/RuO2‐IrO2@Pt electrode as the anode and porous titanium plate as the cathode. The operation parameters included electrolyte type, electrolyte concentration, current density, initial concentration of pollutants and pH, were investigated. The degradation efficiency and energy consumption were calculated and compared with traditional electrolyzer. In the zero‐gap flow‐through microfluidic reactor, 100 % of both tetracycline and norfloxacin can be decomposed in 15 min, and high mineralization rate were achieved under the optimized reaction condition. And the reaction was consistent with pseudo‐first‐order kinetics with k value of 0.492 cm−1 and 1.010 cm−1, for tetracycline and norfloxacin, respectively. In addition, the energy consumption was 28.33 kWh ⋅ kg−1 TC and 8.36 kWh ⋅ kg−1 NOR, for tetracycline and norfloxacin, respectively, which was much lower than that of traditional electrolyzer. The LC–MS results showed that tetracycline underwent a series of demethylation, dehydration and deamination reactions, and the norfloxacin went through ring opening reaction, decarboxylation and hydroxylation reaction, and finally both produced CO2 and H2O.
摘要 本研究以多孔Ti/RuO2-IrO2@Pt电极为阳极,多孔钛板为阴极,构建了零间隙流过式微流体反应器,用于降解水中的四环素和诺氟沙星。研究的运行参数包括电解质类型、电解质浓度、电流密度、污染物初始浓度和 pH 值。计算了降解效率和能耗,并与传统电解槽进行了比较。在零间隙直流式微流体反应器中,四环素和诺氟沙星均能在 15 分钟内被100%分解,并且在优化的反应条件下实现了较高的矿化率。反应符合假一阶动力学,四环素和诺氟沙星的 k 值分别为 0.492 cm-1 和 1.010 cm-1。此外,四环素和诺氟沙星的能耗分别为 28.33 kWh ⋅ kg-1 TC 和 8.36 kWh ⋅ kg-1 NOR,远低于传统电解槽。LC-MS 结果表明,四环素经历了一系列脱甲基、脱水和脱氨反应,诺氟沙星则经历了开环反应、脱羧和羟化反应,最后都生成了 CO2 和 H2O。