The Preparation And Application Of New Functional Porous Material SPME Fibers

Due to the complexity and low content of organic pollutants in the environment,traditional commercial SPME extraction coatings were hard to meet the requirements of the complex sample detection.The development of new extraction coatings with excellent adsorption properties has become a hot research field in analytical chemistry.Since the extraction coating material is the key to the analytical application of solid-phase microextraction,this paper was based on the porous materials?porous organic polymers,metal-organic framework compounds and porous carbon materials?with high specific surface area,large pore volume,and adjustable material morphology,through the modification and modification of functional group,material morphology and pore structure,a novel solid-phase microextraction probe was prepared,and the relationship between the extraction performance of the obtained solid-phase microextraction fiber and the microstructure of the material was studied.Based on the condensation reaction of homotriphenols and terephthalaldehyde,three different pore structure porous organic polymers were prepared by adding different amounts of cetylpyridinium bromide during the polymerization.The relationship between the surface area,pore structure and adsorption performance of porous organic polymers was studied.The SPME fibers were prepared and used for the determination of benzene compounds in real water samples.The results show that the organic porous polymer with large pore volume has the best effect on the adsorption of trace benzene series.In the adsorption process,the pore volume plays an important role in improving the adsorption performance.Based on this fiber,a method for the determination of trace benzenes?BETX?in water samples was developed.The method has a wide linear range(2-500 ng·L^-1)and low detection limit(0.10-0.29 n·g L^-1)features.8-aminooctanoic acid doped UIO-66?Am-UIO-66?was prepared by the method of molecular doping to produce defects.Amino-modified Am-UIO-66 has better adsorption properties for nitrosamines as Am-UIO-66 has a larger specific surface area,pore volume,and stronger surface polarity than UIO-66,and maintains the original pore size without producing macroporosity defects.The fiber has a linear range of 20-10000 ng·L^-11 for the detection of nitrosamines and the detection limit is2.61-6.12 ng·L^-1.Am-UIO-66 was applied to the detection of nitrosamines in rubber gloves and has achieved satisfactory results.Using magnesium acetate as a raw material,polyvinylpyrrolidone?PVP?as surfactant,in the environment of ethylene glycol solution,form similar flower-like magnesium glycolate nano-materials by hydrothermal reaction.After carbonization,MgO&C composites were prepared.As the material has a special surface morphology and a large pore volume,it shows good effect for the adsorption of polycyclic aromatic hydrocarbons.The fiber has a linear range of 5-1000 ng·L^-11 for detection of polycyclic aromatic hydrocarbons?PAHs?in water and a limit of detection?LOD?of0.10-0.20 ng·L^-1.MgO&C was applied in the analysis and detection of polycyclic aromatic hydrocarbons in water at last.