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

Xu T 1 , Tang X 2 , Qiu M 2 , Lv X 3 , Shi Y 4 , Zhou Y 5 Show all authors , Xie Y 6 , Naushad M 7 , Lam SS 8 , Ng HS 9 , Sonne C 10 , Ge S 11

Affiliations 

  • 1 College of Science, Central South University of Forestry and Technology, Changsha, 410004, China
  • 2 School of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, China
  • 3 College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
  • 4 Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China
  • 5 College of Science, Central South University of Forestry and Technology, Changsha, 410004, China; Aerospace Kaitian Environmental Technology Co., Ltd., Changsha, 410100, China. Electronic address: [email protected]
  • 6 People's Hospital of Ningxiang City, Ningxiang, Hunan, 410600, China
  • 7 Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
  • 8 Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, Kuala Nerus, 21030, Terengganu, Malaysia; Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, Taiwan; Center for Transdisciplinary Research, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India. Electronic address: [email protected]
  • 9 Centre for Research and Graduate Studies, University of Cyberjaya, Persiaran Bestari, 63000, Cyberjaya, Selangor, Malaysia
  • 10 Aarhus University, Department of Bioscience, Arctic Research Centre (ARC), Frederiksborgvej 399, PO Box 358, DK-4000, Roskilde, Denmark
  • 11 Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China; Aerospace Kaitian Environmental Technology Co., Ltd., Changsha, 410100, China. Electronic address: [email protected]
J Environ Manage, 2023 Oct 15;344:118718.
PMID: 37541001 DOI: 10.1016/j.jenvman.2023.118718

Abstract

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.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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