Study On Synergistic Reduction Of Wastewater Toxicity Based On BiOX Adsorption And Photocatalysis

Clean and non-polluting water is one of the basic requirements of all living things,including humans.Due to global industrialization and population growth,industrial,household and agricultural waste emissions pollute natural water,which has made its availability a major challenge for today.Therefore,it is very important to remove contaminants and pathogens from wastewater.Developing sustainable and affordable technology has always been a challenge in the water treatment process.Recently,the use of oxide semiconductors based on"photocatalysis"environmental remediation has attracted great attention.In this paper,anionic doping technique is first used to do a variety of halogen cluster elements into a single bismuth oxyhalide and A batch of solid solution photocatalytic materials with unique properties in terms of micromorphology,specific surface area,visible light response,band gap size,and electrical conductivity were obtained.Then,the nanocomposites with strong photocatalytic oxidation ability were obtained by modifying the hafnium oxyhalide with graphene.The specific research content is as follows:?1?The binary bismuth oxyhalide BiOCl_xBr_1-x-x solid solution nanophotocatalyst was prepared by solvothermal method and characterized and tested by XRD?XPS?SEM?TEM?UV-Vis?DRS?PL?BET and cytotoxicology experiments.The obtained photocatalytic material has a removal rate of Cr???of up to 97.7%in 60 min,and almost completely degrades tetracycline hydrochloride in 35 min.This shows that the prepared photocatalytic material not only has good reducing ability,but also has excellent photocatalytic oxidation ability.The toxicity of pollutants after photocatalytic reduction was greatly reduced by bacterial toxicological experiments.?2?BiOCl_xI_1-x-x and BiOBr_xI_1-x-x solid solution photocatalytic materials were obtained by one-step solvothermal synthesis.The morphology,structure and optical properties of the materials were characterized and tested by XRD,SEM,TEM,XPS,UV-Vis-DRS,PL,BET and Mott-Schottky experiments,respectively.The prepared BiOCl_xI_1-x-x and BiOBr_xI_1-x-x solid solution materials have strong absorption capacity in the visible light range and have a large specific surface area.The above materials not only have good adsorption capacity for Cr???,but also have excellent reducing ability for Cr???removal.The adsorption and photocatalytic reduction synergistic removal of Cr???can better deal with the pollution problem of Cr???.This will provide a reference for dealing with heavy metal pollution.?3?White BiOCl was synthesized by mild hydrothermal method,and different proportions of rGO/BiOCl nanocomposites were obtained by doping with graphene oxide.Due to the interaction between graphene and BiOCl,BiOCl is transformed from?001?crystal plane to?010?crystal plane,and thus the growth state of BiOCl is affected,resulting in the formation of microspherical rGO/BiOCl.The composite material not only has good absorption capacity for visible light,but also has good electrical conductivity and strong electron-hole migration ability.The degradation efficiency of photocatalytic oxidation of ceftriaxone sodium in this material is as high as 92%within 2 hours.