The Preparation And Application In Antibiotic Wastewater Purification Of Zinc Ferrite-based Composite Photocatalysts

In recent years,with the rapid increase in the use of antibiotics,resulting in a large number of antibiotic pollution,in the performance of water pollution is particularly prominent.In environmental management technology,photocatalytic technology has wide application prospect because of its high efficiency,low cost and no pollution.At present,the research focus is focused on the preparation of photocatalysts with visible light response and magnetic recyclable properties.The spar-type ferrite semiconductor photocatalytic materia is one of the most popular research materials with their unique optical,magnetic and electrical properties.In this paper,the magnetic spinel-type ferrite photocatalysts,magnetic zinc ferrite,cobalt ferrite and zinc ferrite were prepared by hydrothermal method.The magnetic activity of bismuth oxychloride/zinc ferrite composite photocatalyst and cobalt Ion-doped zinc ferrite/graphite-phase composite photocatalyst,and its structure,morphology,photocatalytic performance of magnetic agent were characterized and tested.The effects of different composition ratios on the structure,morphology and photocatalysis were reseaechde.The effect of photocatalysts with different ferrite contents on the photocatalytic degradation of different antibiotics was investigated by visible light irradiation.The main conclusions are as follows:1.The spinel-type structure of zinc ferrite,zinc zinc ferrite and cobalt ferrite nanoparticles were prepared by hydrothermal method under different conditions of adding different acids and different reaction times.The results show that the ferrite nanocrystalline catalyst prepared by adding tartaric acid and the reaction time is 48 h,the crystallinity is good,the crystallinity is about 10 nm,and the distribution is uniform.At the same time,the initial photocatalytic degradation of Znx Co1-xFe₂O₄?x= 0-1?ferrite showed that the photocatalytic degradation rate of Zn_0.5Co_0.5Fe₂O₄ was the highest when X = 0.5.2.The BiOCl/ZnFe₂O₄ composites were prepared by hydrothermal synthesis of ZnFe₂O₄ nanoparticles and bismuth oxychloride nanocapsules.By adding different amounts of BiOCl,the composites with different bismuth oxychloride nanocapsules contents were obtained.The results showed that ZnFe₂O₄ nanoparticles were successfully supported on BiOCl nanodiscs.The introduction of BiOCl nano-disk,the successful formation of a heterojunction structure,an effective inhibition of thephotoelectron complex,extended photoelectron,hole life,thereby enhancing the photocatalytic efficiency.Photocatalytic experiments show that the degradation of penicillin G in BiOCl/ZnFe₂O₄ composites is as high as 99% under the irradiation of visible light for 180 min.3.On the basis of the above experiment,the addition of carbon nitride powder to ferric nitrate,zinc nitrate and cobalt nitrate precursor solution was carried out by hydrothermal method to prepare the g-C₃N₄ content of different g-C₃N₄/Zn_0.5Co_0.5Fe₂O₄ composite materials.The results show that Zn_0.5Co_0.5Fe₂O₄ nanoparticles can be successfully supported on the g-C₃N₄ 2-dimensional nanosheet,and the addition of g-C₃N₄ can effectively inhibit the recombination of the photogenerated carriers in the Zn_0.5Co_0.5Fe₂O₄ nanoparticles,The photocatalytic properties of the material.Under the visible light irradiation,the photocatalytic performance of the composites was better than that of g-C₃N₄ and pure Zn_0.5Co_0.5Fe₂O₄ nanoparticles,and the degradation degree of chloramphenicol was98.8% at 180 min.