Degradation of antibiotic ampicillin on boron-doped diamond anode using the combined electrochemical oxidation - Sodium persulfate process
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Date
2018
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Journal ISSN
Volume Title
Publisher
Academic Press
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info:eu-repo/semantics/closedAccess
Abstract
In this work, the electrochemical oxidation of antibiotic ampicillin (AMP) on a boron-doped diamond anode in the presence of sodium persulfate (SPS) was investigated (EO/SPS process). Experiments were conducted at AMP concentrations between 0.8 and 3 mg/L, SPS concentrations between 100 and 500 mg/L, current densities between 5 and 110 mA/cm2, in three water matrices (ultrapure water, bottled water and secondary treated wastewater), using 0.1 M Na2SO4 as the supporting electrolyte. AMP degradation follows a pseudo-first order kinetic expression with the apparent rate constant increasing with (i) increasing SPS concentration (from 0.08 min?1 to 0.36 min?1 at 0 and 500 mg/L SPS, respectively, 1.1 mg/L AMP, 25 mA/cm2), (ii) increasing current (from 0.08 min?1 to 0.6 min?1 at 5 and 110 mA/cm2, respectively, 1.1 mg/L AMP, 250 mg/L SPS), and (iii) decreasing AMP concentration (from 0.16 min?1 to 0.31 min?1 at 3 and 0.8 mg/L, respectively, 250 mg/L SPS, 25 mA/cm2). The presence of various anions (mainly bicarbonates) in bottled water did not impact AMP degradation. The observed kinetic constant decreased by 40% in the presence of 10 mg/L humic acid. On the other hand, process efficiency was enhanced almost 3.5 times in secondary effluent due to the electrogeneration of active chlorine species that promote indirect oxidation reactions in the bulk solution. The efficacy of the EO/SPS process was compared to and found to be considerably greater than a process where SPS was activated by simulated solar irradiation at an intensity of 7.3 × 10?7 E/(L.s) (SLR/SPS process). Coupling the two processes (EO/SLR/SPS) resulted in a cumulative, in terms of AMP degradation, effect. The combined process was tested for AMP degradation, mineralization and inhibition to Vibrio fischeri in wastewater; fast AMP removal was accompanied by low mineralization and incomplete toxicity removal. © 2018 Elsevier Ltd
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Keywords
BDD, Ecotoxicity, Emerging contaminants, Kinetics, Process coupling, Solar irradiation, ampicillin, bicarbonate, boron, chlorine, diamond, humic acid, ozone, sodium persulfate, unclassified drug, water, xenon, ampicillin, antiinfective agent, boron, diamond, sodium derivative, sodium persulfate, sulfate, biodegradation, biomineralization, chemical compound, chemical pollutant, concentration (composition), degradation, electrochemical method, electrode, electrolyte, experimental study, humic acid, inhibition, oxidation, pollutant removal, reaction kinetics, solar radiation, toxicity, Aliivibrio fischeri, Article, conductance, current density, drug degradation, ecotoxicity, electrochemistry, high performance liquid chromatography, mineralization, nonhuman, oxidation, solar radiation, total organic carbon, waste water, waste water management, chemistry, electrode, kinetics, oxidation reduction reaction, water pollutant, Vibrio fischeri, Ampicillin, Anti-Bacterial Agents, Boron, Diamond, Electrodes, Kinetics, Oxidation-Reduction, Sodium Compounds, Sulfates, Water Pollutants, Chemical
Journal or Series
Journal of Environmental Management
WoS Q Value
Scopus Q Value
Q1
Volume
223
