Synthesis Of Metal-Organic Framework Materials And Study On Adsorption And Sensing Of Typical Persistent Organic Pollutants

Persistent organic pollutants pollution is an urgent need to address environmental problems.Because of its special structure,long half-life and continuous enrichment in organisms and natural environment,it is of great significance to develop an efficient and sensitive detection method.With the development of technology,the detection methods of persistent organic pollutants are abundant and varied,but the detection process is often tedious and laborious,and most of the current methods are single detection or removal of typical objects.As a new kind of nano-material,metal-organic framework with porous structure and specific optical properties has become a candidate for rapid detection and removal.In this paper,a series of metal-organic framework materials with porous structure and characteristic optical properties were designed and synthesized,and the applications of sensing and removing hazardous substances such as bisphenol compounds were explored,including analytical properties in real samples,removal efficiency in environmental samples,and cyclic testing.First,a zirconium-based metal-organic framework was prepared（UiO-66）,and a selective sensing detection and removal method of clenbuterol hydrochloride was established,which was studied based on real samples.Since UiO-66 has a large specific surface area（1461 cm²/g）and stable optical properties,its fluorescence intensity is quenched to88%after it binds to clenbuterol hydrochloride.At the same time,the adsorption equilibrium of UiO-66to clenbuterol hydrochloride can be achieved at 60 min,and the adsorption efficiency is over 80%.UiO-66 has a linear response to clenbuterol hydrochloride in the range of 4.0-40 ng·mL^-11 concentration,the detection limit is 0.17μM.This result provides a new idea for the simultaneous adsorption and detection of hazardous substances.In addition,an organometallic framework material for highly selective and sensitive detection of bisphenol compounds was synthesized.This sensor has a specific fluorescence sensing effect,which not only has synchronous fluorescence enhancement and quenching effect,but also has excellent characteristics of rapid response to bisphenol compounds and high sensitivity without interference from other coexisting ions.Throughπ-πstacking interaction and hydrogen bonding,the sensor forms fluorescent complexes with bisphenol A,showing its excellent sensing ability,with a detection limit of 26.36 nM.Due to its good stability,Ga-MOF can be recycled many times and applied to real sample detection.This fast,highly sensitive and selective probe,as a powerful sensing tool for further safeguarding food and water safety,has the ability to detect related risks such as trace bisphenol A.Finally,a metal-organic framework material with a stable structure with csq-a topology was also synthesized in this paper（BUT-16）,and a rapid and convenient method for adsorption of bisphenol and mycotoxins was established.Moreover,compared with traditional materials,BUT-16 not only has better adsorption performance(BET=2124 m²g^-1),but also can rapidly adsorb bisphenol and mycotoxins at the same time,and the adsorption capacity reaches 48 mg g^-1,which is more than twice that of traditional materials such as activated carbon.Taking zebrafish as the research object,the effect of BUT-16 on the removal of bisphenol A in water was investigated.The results show that BUT-16 can effectively remove bisphenol A in water and reduce the damage of bisphenol A to zebrafish.When the concentration of bisphenol A in the water was 7 mg/L,the liver,intestine and gills of the zebrafish caused obvious necrosis symptoms.However,after removing BPA with BUT-16,these zebrafish organs showed no obvious damage.At the same time,BUT-16 also showed no obvious damage to the zebrafish body.