Degradation of levofloxacin from antibiotic wastewater by pulse electrochemical oxidation with BDD electrode

• Published in: Journal of environmental management Vol. 344; p. 118718
• Main Authors: Xu, Tao, Tang, Xiting, Qiu, Meiting, Lv, Xiaoliu, Shi, Yang, Zhou, Yihui, Xie, Yanfei, Naushad, Mu, Lam, Su Shiung, Ng, Hui Suan, Sonne, Christian, Ge, Shengbo
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15-10-2023
• Subjects: BDD electrode; Degradation mechanism; Levofloxacin; Parameter optimization; Pulse electrochemical oxidation; Levofloxacin; Degradation mechanism; Parameter optimization; Pulse electrochemical oxidation; BDD electrode
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2023.118718

Antibiotic-containing wastewater is a typical biochemical refractory organic wastewater and general treatment methods cannot effectively and quickly degrade the antibiotic molecules. In this study, a novel boron-doped diamond (BDD) pulse electrochemical oxidation (PEO) technology was proposed for the efficient removal of levofloxacin (LFXN) from wastewater. The effects of current density (j), initial pH (pH0), frequency (f), electrolyte types and initial concentration (c0(LFXN)) on the degradation of LFXN were systematically investigated. The degradation kinetics under four different processes have also been studied. The possible degradation mechanism of LFXN was proposed by Density functional theory calculation and analysis of degradation intermediates. The results showed that under the optimal parameters, the COD removal efficiency (η(COD)) was 94.4% and the energy consumption (EEC) was 81.43 kWh·m−3 at t = 120 min. The degradation of LFXN at pH = 2.8/c(H2O2) followed pseudo-first-order kinetics. The apparent rate constant was 1.33 × 10−2 min−1, which was much higher than other processes. The degradation rate of LFXN was as follows: pH = 2.8/c(H2O2) > pH = 2.8 > pH = 7/c(H2O2) > pH = 7. Ten aromatic intermediates were formed during the degradation of LFXN, which were further degraded to F−, NH4+, NO3−, CO2 and H2O. This study provides a promising approach for efficiently treating LFXN antibiotic wastewater by pulsed electrochemical oxidation with a BDD electrode without adding H2O2.
•Novel boron-doped diamond (BDD) pulse electrode efficiently removed levofloxacin.•The chemical oxygen demand removal achieved 94.4% within 120 min.•Acidic medium (pH 3) is preferrable for efficient removal of levofloxacin (LFXN).•Removal of levofloxacin by BDD consumed less energy (81.43 kWh·m−3).•Pulsed electrochemical oxidation with BDD electrode is promising for LFXN removal.