Fe 3 O 4/Technology Research On Biodegradation Of Antibiotic Wastewater By Biomass Carbon Cathode

Electrochemical advanced oxidation processes?EAOPs?,which can in-situ produce hydrogen peroxide and other strong oxidants by the electrocatalysis interaction between electrodes have been proven to be an efficient technology for degradation and mineralization of organic contanminants.As a kind of EAOPS,the traditional E-Fenton process had the problems of low H₂O₂ yield,poor degradation effect,and easy generation of large amounts of iron sludge at the cathode.Therefore,the key to the large-scale application of E-Fenton technology is promote the reduction and regeneration of Fe²⁺by improving the production efficiency of H₂O₂ and optimizing the process.In this study,we reported two strategies for synthesis of Fe₃O₄/Biomass-based carbon?Fe₃O₄/C?composites using waste pomelo skins as carbon source,FeCl₃ as iron source.The obtained ferroferric oxide/biomass charcoal compositel was prepared as an electrode,which used for electro-catalytic degradation of ceftazidime and norfloxacin wastewater.The process was the same as the E-Fenton process.These composites were characterized by X-ray diffraction?XRD?,Brunauer-Emmett-Teller?BET?and so on.Results demonstrated that Fe₃O₄/C composites had a larger specific surface area,contributing to the improvement of electric catalytic activity and production of H₂O₂ and·OH for removing pollutant.Furthermore,in the process of electrocatalysis,we investigated the degradation of ceftazidime and norfloxacin as the model organic and pharmaceutical wastewater using Fe₃O₄/C composited as cathode and Ti/Ir O₂/RuO₂ as anode,comparing with biomass charcoal electrodes and commercial electrodes,and conducting economic analysis.Results indicated that the ceftazidime was removaled by Fe₃O₄/C cathode reached 88.9%after 120 min,while the COD removal efficiency of ceftazidime reached 92.0%after 360 min under the the optional experimental conditions:0.1 M Na₂SO₄ initial electrolyte solution,10 mg·L^–11 initial ceftazidime initial solution,and30 m A·cm^–22 current density,3cm separation distance and 5 pH and power consumption priced of 114 yuan/ton.Similarly,the norfloxacin degradation by Fe₃O₄/C cathode reached 85.3%after 120 min,while the COD removal efficiency of norfloxacin reached 97.1%after 480 min under the above optional experimental conditions and power consumption priced of 145 yuan/ton.