Ti/TiHx-NiCo2 O4 阳极电化学氧化氨苄西林的研究

To address the antibiotic resistance risks and environmental hazards caused by the long- term accumulation of the new organic pollutant ampicillin, an environmentally f riendly electrochemical oxidation titanium anode material is developed based on the low cost, high conductivity, and catalytic activity of NiCo2 O4. Firstly, the Ti/TiHx-NiCo2 O4 electrode is prepared via electrodeposition, and its f abrication parameters are optimized through systematic electrochemical characterizations, including catalytic activity, linear sweep voltammetry, and electrochemical impedance spectroscopy. Secondly, the ef f ects of f actors such as initial pH and current density on the degradation ef f iciency of ampicillin during the reaction are investigated. Finally, radical scavenging experiments and accelerated lif espan tests are conducted. The results show that the optimal preparation conditions f or the Ti/TiHx-NiCo2 O4 electrode include a current density of 20 mA · cm- 2, a nickel nitrate concentration of 0. 5 mol · L-1, and three coating layers. Under alkaline conditions （pH=9. 97), the ampicillin degradation rate is the f astest, achieving 97% removal of 50 mg · L-1 ampicillin within 20 min. The optimal current density during degradation is f ound to be 10 mA · cm- 2, under which a 50 mg · L-1 concentration of ampicillin can be completely removed in 40 min. The reaction mechanism of the Ti/TiHx-NiCo2 O4 electrode oxidation involves both direct oxidation （direct electron transf er) and indirect oxidation （hydroxyl radical interactions). The stable service lif e of the Ti/TiHx-NiCo2 O4 anode exceeds 90 hours, and its main deactivation pathways are surf ace passivation and leaching of active components.