Application Of Functionalized Magnetic Microsphere Solid Phase Extraction Agent In The Extraction Of Pyrethroids And Dyes

In recent years,with the continuous improvement of human life quality,organic pesticide and azo dyes in water has great influence on the ecological environment and biological health.Organochlorine pesticides due to its high toxicity and low degradability and effects on aquatic ecosystem is huge and gradually be eliminated,instead of the biological pyrethroid pesticide with low toxicity and short degradation period.Some studies show that short-term residue of pyrethroid pesticides can also affect the body's health,and current detection of trace pesticide pesticide residues always is a challenge.At the same time,with the development of industrial printing and dyeing technology,low residual azo dyes on the human body is not negligible,therefore,based on the current detection methods and means of pyrethroid pesticides and azo dyes in water,the work of this paper will be devoted to the development of a new magnetic solid phase extraction technology?MSPE?,MSPE technology will aim to more effectively detect low residue pyrethroid pesticides and azo dyes.Sample pretreatment is a key step in the process of sample detection and analysis,however,magnetic solid phase extraction?MSPE?analysis based on magnetic material or magnetic responsive materials is a new kind of sample pretreatment technology.Magnetic solid phase extraction?MSPE?technology can realize phase separation by applying an additional external magnetic field such as a permanent magnetic field or electromagnetic field,and the operation process is simple and easy.MSPE analysis technology can be used for bulk liquid or solid sample pretreatment comparing to other sample pre-treatment method,it is a high efficiency,rapid separation processing,short time required sample pretreatment method.Fe₃O₄ are magnetic responsive nanoparticles,which can be used to modify different functional groups on the magnetite nanoparticles surface to achieve different target applications.With the affinity of long chain alkyl to organic compounds,long chain alkyl is modified by silanylation reagents on the surface of iron oxide particles,at the same time,in order to protect the functional Fe₃O₄ nanoparticles with hydrophobic after alkylating from being not easy to disperse in water,then the Fe₃O₄ nanoparticle is modified with chitosan to increase the dispersion of water.In this paper,the superparamagnetic iron oxide magnetic nanoparticles have been prepared by coprecipitation method,then active hydroxyl is modificated on the surface of Fe₃O₄nanoparticlebygoodbiomimeticmodificationpropertiesofdopamine.Trimethoxyvinylsilane is modificated in active hydroxyl of dopamine on the surface of Fe3O4nanoparticle by silanylation reagents.At the same time,the 10-Undecenoyl Chloride is used to derive the active hydroxyl group of chitosan,which has a vinyl group.Finally,the chitosan derived 10-Undecenoyl Chloride and functional Fe₃O₄ nanoparticle was carried out free radical polymerization of vinyl group on the condition of 2,2-Azobis?2-methylpropionitrile?and heating,which is.final prodrct,MSPE.Finally,the obtained extractant?Fe₃O₄@PDA@CS?was used in batch experiments to extract pyrethroid pesticide?permethrin,tetramethrin,fenvalerate?and azo dyes?rhodamine B,Methylene blue?from aqueous solutions.The effect of extraction time,extractant dosage,initial concentration of solution,PH,eluant election and eluant time were investigated.