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Danaee, I; Schwaminger, SP; Farhadi, A; Vrsalovic, L; Amarzadeh, M.
Enhanced cephalosporin antibiotics degradation through simultaneous electrooxidation-elecrocoagulation treatment using IrO2-RuO2-TiO2-Ta2O5 mixed metal oxide anode
J WATER PROCESS ENG. 2025; 79: 108878 Doi: 10.1016/j.jwpe.2025.108878
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Authors Med Uni Graz:

Schwaminger Sebastian

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Abstract:

In the present study, cephalosporin antibiotics-cefixime, cefazolin, and cefadroxil-were treated using a simultaneous electrocoagulation-electrooxidation (EC-EO) process with a precisely controlled energy deviding between EC and EO. First, antibiotic degradation was investigated via EO using a mixed-metal-oxide (MMO)-coated anode prepared by thermal decomposition, and the coating morphology was comprehensively analyzed. A high removal efficiency (96 %) was achieved for cefixime within 40 min of electrolysis at 1.3 A and pH 7. Current efficiency (CE) and mineralization current efficiency (MCE), calculated from COD and TOC removal, were 23 %, 18 %, and 14 % (CE) and 16 %, 12 %, and 9 % (MCE) for cefixime, cefadroxil, and cefazolin, respectively, at 0.9 A over 40 min. EC alone achieved COD removals of 76 %, 59 %, and 49 % for cefixime, cefazolin, and cefadroxil, respectively. Compared with EC or EO alone, the simultaneous EC-EO system achieved substantially higher COD removal (>80 %), attributable to the synergistic effects of floc generation and anodic oxidation. By contrast, the sequential hybrid processes (EO-EC and EC-EO) showed much lower COD removal (approximate to 30 %). Adsorption interactions of the drugs with Al(OH)(3), their propensity for oxidation, and the formation of degradation intermediates were examined using DFT and Fukui functions to corroborate the experimental results. This study provides a new approach for designing efficient EO anode and a combined EC-EO degradation system for removing organic pollutants from wastewater. An IrO2-RuO2-TiO2-Ta2O5 anode has attracted significant attention due to its unique combination of high surface area, catalytic activity, electrical conductivity, and corrosion resistance.

Find related publications in this database (Keywords)

Electrooxidation

Electrocoagulation

Cephalosporin antibiotics

Mineralization

Density functional theory

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