Department of Chemical Engineering, Thapar University, Patiala, Punjab, India.
Department of Chemical Engineering, Thapar University, Patiala, Punjab, India.
Chemosphere. 2018 Feb;193:685-694. doi: 10.1016/j.chemosphere.2017.11.065. Epub 2017 Nov 16.
Present study investigates the potential of Ti/RuO electrode for degradation and mineralization of Ofloxacin (OFLX) antibiotic from synthetic wastewater by electro-oxidation (EO) method, not reported earlier. Effects of various EO parameters such as applied current (I), initial pH, initial OFLX concentration (C) and supporting electrolyte concentration on %OFLX removal efficiency and %TOC removal efficiency were systematically studied and reported. Decay kinetics of OFLX by varying C and applied I were also studied. Additionally, mineralization current efficiency and specific energy consumption of OFLX mineralization were evaluated. Moreover, mode of oxidation method involved (direct and/or indirect oxidation) was also explored. Major OFLX transformation products during EO were identified using UPLC-Q-TOF-MS, and possible degradation reaction mechanism was proposed. Furthermore, operating cost analysis was performed to check the economic feasibility of the EO process. The optimum pH and current (I) were found to be ≈6.8 (natural pH of OFLX wastewater) and 1 A, respectively. Mineralization current efficiency decreased from 7.8% to 4.9% with increase in I value from 0.25 to 1 A. ≈80% of OFLX removal in 30 min of electrolysis and 46.3% TOC removal in 240 min of electrolysis at I = 1 A were observed. Pseudo-first-order kinetic model best fitted the experimental data showing R value ≈ 0.99 for all the C and applied I studied.
本研究考察了 Ti/RuO 电极在电氧化（EO）方法中降解和矿化合成废水中氧氟沙星（OFLX）抗生素的潜力，此前尚未有报道。系统研究并报告了各种 EO 参数（如施加电流（I）、初始 pH、初始 OFLX 浓度（C）和支持电解质浓度）对 OFLX 去除效率和 TOC 去除效率的影响。还研究了通过改变 C 和施加 I 来研究 OFLX 的衰减动力学。此外，评估了 OFLX 矿化的矿化电流效率和比能消耗。此外，还探索了涉及的氧化方法模式（直接和/或间接氧化）。使用 UPLC-Q-TOF-MS 鉴定了 OFLX 电氧化过程中的主要转化产物，并提出了可能的降解反应机制。此外，还进行了运行成本分析，以检查 EO 工艺的经济可行性。发现最佳 pH 和电流（I）分别约为 6.8（OFLX 废水的自然 pH）和 1 A。随着电流值从 0.25 增加到 1 A，矿化电流效率从 7.8%下降到 4.9%。在 1 A 的电流下，电解 30 分钟可去除约 80%的 OFLX，电解 240 分钟可去除 46.3%的 TOC。拟一级动力学模型最适合实验数据，所有研究的 C 和施加的 I 都表现出 R 值约为 0.99。
