Preparation And Applications Of Stainless Steel Wire Based Functionalized Nano Gold, Silver And Copper Coatings For Solid-phase Microextraction

UV-filters are a group of emerging environmental pollutants,which are present at ultra trace levels in aquatic environment.Therefore highly sensitive methods are needed for their analysis.SPME is simple,rapid and effective sample preparation technique,which has been widely used in many fields including environment,food,biology and medicine.In this thesis,Au,Ag and C uO nanostructures were firstly fabricated and followed by self-assembled modification.Besides,the extraction performances of the coatings were studied coupled to HPLC with UV detector,and the effects of extraction parameters were investigated and optimized.The proposed SPME-HPLC-UV method was applied to the analysis of UV-filters in water samples.This thesis consists of seven chapters as follows:Chapter?:ReviewsThe kinds of UV-filters were introduced,then SPME technique was described and the research significance and ides were discussed.Chapter?:Preparation of AuNPs coatingAuNPs/SS coating and AuNPs/ESS coating were rapidly prepared by electrochemical technology.The fibers were characterized by SEM and EDS.Electrochemical conditions such as the electrolyte concentration,the scanning rate and the scanning cycles were investigated and optimized.The proposed method was simple and reproducible.The AuNPs were uniform and dense,and resistant to organic solvents,highly mechanical.The AuNPs/ESS fiber is more robust than AuNPs/SS fiber.Chapter?:Preparation and application of C₈-S-AuNPs/ESS fiber1,8-octanedithiol molecules were self-assembled on the AuNPs fiber.The fibers were characterized by SEM and EDS.The extraction performance of the fabricated fiber was investigated with UV-filters as model compound.Experimental conditions were investigated and optimized.The proposed method was successfully applied to determination of UV-filters in environmental water samples.The fiber can be used up to 200 times.The results showed that LR were 0.50-400,0.1-400,0.1-400 and 0.5-400?g·L^-1,r² were>0.9989 and LODs were between 0.025-0.056?g·L^-1.The recovery ranged from 92.0%to 106.0%with RSD from 3.0%to 9.0%obtained from water samples.The fiber coating is suitable for the preconcentration and determination of UV-filters in environmental water samples.Chapter?:Preparation and application of HO-C₁₁-S-AuNPs/ESS fiber11-mercapto-1-undecanol were self-assembled on the AuNPs fiber.The fibers were characterized by SEM and EDS.The extraction performance of the fabricated fiber was investigated with UV-filters as model compound.Experimental conditions were investigated and optimized.The proposed method was successfully applied to determination of UV-filters in environmental water samples.The fiber can be used up to 150 times.The results showed that LR were 0.50-400,0.1-400,0.1-400 and0.5-400?g·L^-1,r² were>0.9940 and LODs were between 0.024-0.081?g·L^-1.The recovery ranged from 90.7%to 101.4%with RSD from 4.0%to 8.9%.The fiber coating is suitable for the preconcentration and determination of UV-filters in environmental water samples.Chapter?:Preparation of AgNDs coatingAgNDs coating was rapidly prepared on the etched stainless steel wire.The samples were characterized by SEM and EDS.Electrochemical conditions such as the scanning rate and the scanning cycles were investigated and optimized.The electrochemical method was proved to be simple and reproducible.The AgN Ds was uniform,and resistant to organic solvents,highly mechanical and unbreakable.Chapter?:Preparation and application of HS-C_x-S-AgNDs/ESS fiber1,2-ethylenedithiol,1,3-propanedithiol,1,6-hexanedithiol and 1,8-octanedithiol molecules were self-assembled on the AgNDs fiber.The fibers were characterized by SEM and EDS.The extraction performance of the fabricated fibers were investigated with UV-filters as model compound.Experimental conditions were investigated and optimized.The proposed method was successfully applied to determination of UV-filters in environmental water samples.The fiber can be used up to 150 times.The results showed that LR were 0.30-400,0.3-400 and 0.5-400?g·L^-1,r²were>0.9973 and LODs were between 0.05-0.12mg·L^-1.The recovery ranged from 85.5%to 105.5%with RSD from 5.7%to 8.7%.The fiber coating is suitable for the preconcentration and determination of UV-filters in environmental water samples.Chapter?:Preparation and application of CuO/ESS fiberA nanosheet C uO coating was rapidly prepared on the etched stainless steel wire.The fibers were characterized by SEM and EDS.The electrochemical method was proved to be simple,rapid and reproducible.The nanosheet C uO coating was uniform and dense,highly mechanical and unbreakable.Experimental conditions were investigated and optimized.The proposed method was successfully applied to determination of UV-filters in environmental water samples.The fiber can be used up to 150 times.The results showed that LR were 0.50-400,0.10-400,0.10-400 and0.5-400?g·L^-1,r² were>0.9950 and LODs were between 0.025-0.051?g·L^-1.The recovery ranged from 94.0%to 104.3%with RSD from 5.2%to 8.6%.The fiber coating is suitable for the preconcentration and determination of UV-filters in environmental water samples.