Preparation And Photocatalytic Performance Research Of Magnetic CuFe₂O₄,CuFe₂O₄/AgBr Photocatalysts With Visible-light-driven

For several years,dye wastewater and antibiotic wastewater have posed great risks to the water environment and human health,and thus causing wide attention of the society.Traditional water treatment methods have disadvantages of long period,high cost and high energy consumption.Because of its mild reaction conditions,non-toxic,environmental friendly,and can directly use the sun as an energy source,semiconductor photocatalytic oxidation technology shows a good application prospect in terms of water treatment.However,at present,photocatalysis faces some challenges of low efficiency,the catalyst is not stable,difficulty to recycle,etc.Therefore,it is important to design the new,higher activity,easy recovery photocatalytic materials.The CuFe₂O₄ and CuFe₂O₄/AgBr composites with different CuFe₂O₄ contents were prepared.The as-synthesized photocatalysts were characterized by means of X-ray diffraction?XRD?,scanning electron microscope?SEM?,UV-vis diffuse reflectance spectrum?UV-vis DRS?,X-ray photoelectron spectroscopy?XPS?and vibrating sample magnetometer?VSM?.In experiment,we choosed methyl orange?MO?and tetracycline hydrochloride?TCH?as target pollutant.The photocatalytic performance of photocatalysts were investigated in detail.The main contents of the experiments are as following:1.In the experiment,we choosed Cu?NO₃?₂·3H₂O and Fe?NO₃?₃·9H₂O as raw materials,copper ferrite?CuFe₂O₄?was successfully synthesized via sol-gel method,chemical coprecipitation method and hydrothermal method,and as-synthesized catalysts were characterized by different techniques.2.MO was selected as target pollutant,and added H₂O₂ in the reaction system,the effects of synthetic method,surfactant and complex agent,H₂O₂ concentration,initial concentration of MO,catalysts concentration,the type and concentration of inorganic salt on photocatalytic performance were investigated.The results show that synthetic method has big influence on the photocatalytic properties of thecatalysts: sol-gel method > chemical coprecipitation method > hydrothermal method.The products which were synthesized by different complex agents have big influence on decolorization efficiency,and have very little influence on decolorization rate of MO.After illumination of Xe lamp for 120 min,the decolorization rate of MO could reach more than 98% for CuFe₂O₄ which was synthesized by sol-gel method.Besides,H₂O₂ concentration,initial concentration of MO and catalysts concentration have influence on the decolorization rate of MO.The highest decolorization rate of MO was 99% with H₂O₂ concentration of 80 mmol/L,initial MO concentration of 20mg/L,catalysts concentration of 1.00 g/L.3.The CuFe₂O₄/AgBr composite photocatalysts were prepared via hydrothermal method with tartaric acid as the complex agent.After illumination of Xe lamp for 120 min,when the mass fraction of copper ferrite was 40%,initial TCH concentration was 20 mg/L,catalysts concentration was 2.00 g/L,the degradation rate of TCH was 93%.Finally,the degradation kinetics and possible mechanism of photocatalytic reaction were further explored.