The Synthesis Of Metal-organic Frameworks And Its Application Of Disperse Dyes And N-nitrosamines Residues Analysis In Environmental Water Samples

Metal-organic frameworks?MOFs?have large surface area,high porosity,small pore size,high structural diversity and stability,large adsorption capacity,strong adsorption capacity and novel structure,which are superior and novel.The structural characteristics have broken through the limitation of the application of zeolite-like porous materials in the field of biochemistry.As a new type of adsorption separation material,it has unlimited development potential.In this paper,two kinds of metal-organic framework materials were successfully prepared and applied to actual environmental water samples and combined with ultra performance liquid chromatography-tandem mass spectrometry?UHPLC-MS/MS?to study Disperse dyes?DDs? and removal efficiency of N-nitrosamines?NAs?.The main contents of this paper include the following:1.Metal-organic frameworks NH₂-MIL-101?Cr?and MIL-101?Cr?were synthesized by one step.The surface morphology was characterized by SEM,TEM,and FT-IR.The synthesized materials were applied as adsorbent for the Solid phase extraction?SPE?of five DDs from environmental water samples,and the eluted analytes were determined by UHPLC-MS/MS.The prepared NH₂-MIL-101 showed better extraction efficiency for target DDs compounds.Several experimental parameters affecting extraction efficiency of five DDs such as amount of adsorbents,sample pH and ionic strength,type and amount of the eluent,extraction time and desorption conditions were examined.The experimental results indicate that the recoveries of DDs were over 85.0%with 8.0 mg NH₂-MIL-101adsorption for 7.0 min.Under the optimal experimental conditions,good linearity for the analytes in the range from 0.01-100?g/L with coefficients of determ R?0.9987 were obtained.The developed method was successfully applied to the analysis of DDs in environmental water samples,with recoveries of the method were in the range from 81.0 to119%and the relative standard deviations?RSDs?varied between 4.7 and 8.5%for three sewage treatment plant water samples.The method is simple,rapid,accurate and reliable with low detection limit and can be applied to analyze the trace residue of DDs in environmental water samples.2.Solid-phase extraction method was developed based on the MIL-101?Cr?,which was selected as adsorbent for the extraction of NAs in environmental water samples coupled with UHPLC-MS/MS.The surface morphology was characterized by SEM,TEM and FT-IR.The experimental parameters were investigated including the amount of MIL-101?Cr?,extraction time,sample pH and desorption conditions.The experimental results indicate that when the pH of sample was 9.0,the recoveries of NAs were over63.5%with 6.0 mg MIL-101?Cr?within 9.0 min at 30?.The detection limits of the proposed method were in the range of 0.029-0.238?g/L.The developed method was successfully applied to the analysis of NAs in environmental water samples,the recoveries were in the range from 77.90 to 107.18%and the RSDs was within 6.71%.The proposed method was simple,rapid and accurate,which could be applied to the analysis of the trace amount NAs in environmental water samples.