Near Infrared Light Response Of Nano Black Phosphate Composite Material Synthesis And Photocatalytic Degradation Of Antibiotic Performance Study

As a class of widely used antibiotics,fluoroquinolone antibiotics have received more and more attention around the world.Norfloxacin antibiotics are the most representative antibiotics among them because of their good efficacy,quick results and The advantages such as small side effects have received widespread attention worldwide.A large amount of use has caused the problem of norfloxacin pollution to become increasingly serious.So far,various methods that have been applied to efficiently degrade norfloxacin antibiotic residues and accumulation in water environment pollution have been extensively and deeply studied.Among these technologies,advanced oxidation technology?AOPs?has been extensively researched and applied in the field of environmental pollution control due to its advantages of simple treatment technology,excellent degradation effect,repeatable batch and non-selective oxidation.Black phosphorus?BP?,which has a layered two-dimensional structure similar to graphene,has been successfully stripped manually for the first time since 2014 and has now caused explosive worldwide attention and research.As another isomer of phosphorus elemental elements other than red phosphorus and white phosphorus,BP is also the most stable isomer form among the three.The reason why BP can attract such great attention is that it has a high carrier fluid electron mobility,which can reach 10⁴cm²/?V s?.At the same time,another important reason is that it has an adjustable band gap structure that graphene does not have,which makes it have enormous potential in the field of photocatalytic materials.Although BP has the potential to develop into the most promising photocatalytic material,BP also has some obvious defects,such as shortcomings such as general stability,easy oxidation,and immature technological development.The nano silver?Ag NPs?and polyethylene glycol?PEG?as metal ion deposition and surface modifiers are more mature representatives can well compensate for the shortcomings of BP.Therefore,by separately loading Ag NPs and PEG as composite materials on the surface of BP,the stability of BP can be effectively improved so that it is not easily oxidized,and at the same time,the photo-generated carrier separation on the surface of BP can be promoted,so that its photoactivity can be improved.In this study,two composite photocatalytic materials were developed and designed to improve the stability and catalytic performance of BP,and used for the degradation and removal of norfloxacin antibiotics in wastewater.This paper first successfully synthesized two new types of nanocomposites,Ag NPs@BP and PEG@BP.Atomic force microscopy?AFM?,transmission electron microscopy?TEM?,scanning electron microscopy?SEM?,and X-ray diffraction?XRD?have been extensively studied on the structural characteristics,microscopic composition,and surface morphology of the two composite materials.The key factors affecting the degradation efficiency of norfloxacin were studied,including light conditions,p H,catalyst type,reaction temperature,catalyst dosage and initial concentration of norfloxacin.Based on the light-induced degradation of norfloxacin antibiotics under near-infrared light,the photocatalytic degradation capabilities and influencing factors of the two composite materials were studied.Experimental results,under the best conditions,about 85.0%of norfloxacin can be rapidly degraded by Ag NPs@BP within 90 min,and can be easily reused for 5 cycles without significantly reducing the catalytic activity;Norfloxacin can be rapidly degraded by PEG@BP within 90 minutes,but its reproducibility is significantly lower than Ag NPs@BP.In this case,we chose Ag NPs@BP with more obvious effects to conduct a more in-depth mechanism exploration.Through the free radical quenching experiment,monitoring the O₂produced in the reaction proposed a photocatalytic mechanism.The enhanced photocatalytic activity of Ag NPs@BP nanocomposites is attributed to the sensitization of BP nanosheets by full collection of near-infrared light and high electron-hole separation efficiency.·O₂^-free radicals degrade norfloxacin pollutants.This research broadens the scope of BP applications and highlights its prospects in dealing with environmental pollution.