Construction Of Dual Z-scheme CuO/CuFe₂O₄/Fe₂O₃ Composite Photocatalyst And Study On Photocatalytic Performance

With the progress of society and the improvement of living level,people’s awareness of environmental protection and energy conservation has gradually enhanced,and environmental governance has become the focus of current work.Norfloxacin（NFX）is one of the most widely used quinolones antibiotics and has been widely used treatment of the various diseases in humans and living organisms.However,NFX has stable structure,so it is a large number of residual in the environmental system in the using process,causing microbial resistance,then causing serious harm to human health and the ecological environment.Therefore,it is urgent to explore an efficient and sustainable solution for removing organic pollutants in the environment.Photocatalytic technology has been deemed as one of the most promising approaches toward organic pollutant removal due to its high efficiency,energy-saving,environmental friendliness and low cost.Conventional single semiconductor photocatalysts have the disadvantages of high recombination rate of the photo-generated carrier charge and narrow solar-light absorption range.To overcome them,researchers construct Z-scheme structure by combination of two or more semiconductors,which can effectively improve photocatalytic degradation performance of whole system.Compared with the binary Z-scheme photocatalytic system,the ternary dual Z-scheme photocatalytic system has more redox interfaces and higher separation efficiency of photo-generated electron-hole pairs.In this study,the ternary dual Z-scheme CuO/CuFe₂O₄/Fe₂O₃nanocomposite photocatalyst was constructed based on the co-precipitation incomplete solid-phase reaction of hydroxide.For the nanocomposite,a series of characterization tests were conducted,and its morphology,structure,composition and so on were analyzed.Using NFX as target pollutant,the photocatalytic degradation performance of whole system were explored under simulated solar light illumination.The possible mechanism of degradation of organic pollutanton using dual Z-scheme CuO/CuFe₂O₄/Fe₂O₃nanocomposite photocatalyst was also proposed.These results show that the dual Z-scheme CuO/CuFe₂O₄/Fe₂O₃nanocomposite photocatalyst can make full use of sunlight.In comparison to pure CuO,CuFe₂O₄ and Fe₂O₃ nanoparticles,the ternary dual Z-scheme CuO/CuFe₂O₄/Fe₂O₃nanocomposite photocatalyst show higher photocatalytic activity.When the nanocomposite photocatalyst dose is 1.5 g·L^-1and the concentration of NFX solution is 5.0 mg·L^-1,the degradation efficiency of NFX using CuO/CuFe ₂O ₄/F e ₂O ₃ nanocomposite photocatalyst is 93.08%under simulated solar light illumination.After four cycle experiments,the dual Z-scheme CuO/CuFe₂O₄/Fe₂O₃nanocomposite photocatalyst still had a good removal efficiency of NFX.In addition,the photocatalytic degradation of Tetracycline（TC）,Chlortetracycline hydrochloride（CTC）,Levofloxacin（LEV）,Rhodamine B（Rh B）and Methylene blue（MB）using CuO/CuFe₂O₄/Fe₂O₃nanocomposite photocatalyst have good removal efficiency under simulated solar light illumination.After the addition of Cl^-,HCO ₃^-,NO ₃^-and SO₄^2-in the dual Z-scheme nanocomposite photocatalytic system,the degradation efficiency of NFX decreased slightly.In the process of degradation NFX using the dual Z-scheme CuO/CuFe₂O₄/F e₂O₃ nanocomposite photocatalyst,the presence of·OH、·O₂^-and h+are confirmed through the active species capture experiments,and·OH plays a major role in the process of degradation.The study on the ternary dual Z-scheme CuO/CuFe ₂O ₄/F e ₂O₃ nanocomposite photocatalytic system provides an effective method for the removal of antibiotics in wastewater,and it also provides certain theoretical foundation for the practical application of photocatalytic oxidation technology in the field of organic wastewater treatment.The study has important research significance.