Study On Microwave Synergistic Nickel Ferrite And Its Carbon Nanotube Composites Activated Persulfate For Tetracycline Hydrochloride Degradation

From the initial discovery of the existence of antibiotics to the present,antibiotics have made great development and progress,and have been widely used in various fields.Antibiotics can be used both to treat human diseases and animal infections,as well as in livestock farming and production because of their excellent growth-promoting effects on organisms.However,most antibiotic drugs used in humans and animals cannot be completely metabolized in the body,and drugs will enter the water environment with excrement,causing serious harm to the environment.As one of the antibiotics with high antibiotic use in the world,the harm caused by improper use of antibiotics to the environment is an urgent problem for human beings,TCH as the main antibiotic used in production and life,how to effectively solve the tetracycline hydrochloride pollution in wastewater has received great attention from researchers.Microwave has attracted widespread attention from scholars because of its characteristics of fast reaction and uniform heating,and the combination of microwave and advanced oxidation technology（AOPs）technology can improve the degradation efficiency of TCH while shortening the reaction time,and at the same time add transition metal ions to synergically activate persulfate（PS）,which can promote the more efficient generation of free radicals in PS,which is conducive to the degradation of pollutants.In this study,a microwave synergistic transition metal compound and carbon nanotube composite activated persulfate system was constructed to improve the TCH removal efficiency in wastewater.In order to enhance the activation of PS,Ni Fe₂O₄（NFO）with very low density and high magnetic permeability was prepared by hydrothermal method.It will be combined with carbon nanotubes（CNTs）with good microwave absorption capacity and activated persulfate effect（NFO@CNT）,and the physical and chemical properties of synthetic materials will be explored by characterization methods such as SEM,TEM,XPS,XRD,ET and BET,and their physicochemical properties such as micromorphology and surface composition will be analyzed,and then microwave synergistic NFO@CNT activated PS degradation TCH system will be constructed,and the TCH degradation effect will be further improved.In order to enhance the activation of PS,Ni Fe₂O₄（NFO）with very low density and high magnetic permeability was prepared by hydrothermal method.It will be combined with carbon nanotubes（CNTs）with good microwave absorption capacity and activated persulfate effect（NFO@CNT）,and the physical and chemical properties of synthetic materials will be explored by characterization methods such as SEM,TEM,XPS,XRD and BET,and their physicochemical properties such as micromorphology and surface composition will be analyzed,and then microwave synergistic NFO@CNT activated PS degradation TCH system will be constructed,and the TCH degradation effect will be further improved.In this study,under the conditions of TCH solution concentration of 20 mg/L,PS solution concentration of 0.5 m M,reaction solution p H value of 7.0 and reaction temperature of 70℃,the reaction reaction was 40min without microwave action,the degradation efficiency was low,and the removal rate of TCH solution was significantly improved by adding NFO and NFO@CNT with a mass of 1.5 g/L to the solution for catalytic degradation,which was 41.8%and 49.2%,respectively.Finally,microwave activated persulfate with a power of 700W was added under the same conditions,and then 1.5g/L NFO and 1.5g/L NFO@CNT were used for synergistic activation,respectively,and the removal rate of TCH was increased to 88.8%and94.2%,respectively,which further explained the promotion effect of microwave on activated persulfate.Further free radical quenching experiments and electron spin resonance experiments（ESR）were carried out,and the experimental results showed that there were three main types of HO·、SO₄^–?和·O₂^–in the reaction system.On this basis,HPLC-MS technology was used to identify possible degradation pathways.In summary,NFO magnetic materials and NFO@CNT magnetic materials were successfully prepared,and in the microwave synergistic catalyst activated persulfate system,NFO@CNT has better synergistic activation persulfate effect than NFO,which can achieve higher removal efficiency for TCH,and the research results provide a meaningful reference for transition metal materials and carbon-based materials in the treatment of antibiotic wastewater.