Preparation And Properties Research Of Solid Phase Microextraction Adsorption Material Based On Two Porous Organic Frameworks

Porous organic frameworks(POFs)materials with high specific surface area,good thermal and chemical stability,controllable pore structure and surface functional groups are widely used in gas adsorption and separation.POFs are used as solid-phase microextraction(SPME)fiber coatings to overcome the disadvantags of commercial fibers,such as low temperature resistance and poor selectivity.In this paper,two kinds of POFs with different structural characteristics were selected to make high-quality fiber SPME extractor.The POF-coated SPME fibers were combined with gas chromatography(GC)to develop analytical methods.The extraction performances of the POF-coated SPME fibers were investigated.The structure-activity relationship between microstructure and SPME extraction performance of POFs were analyzed.Then,the analytical methods were applied to detect the amphetamine-type stimulants in urine and the harmful phenols in environmental water,respectively.First,PAF-41 was used as the coating material of SPME fiber.The headspace SPME(HS-SPME)technology was combinated with GC to develop the analytical method for detecting amphetamine and methamphetamine in water.This analysis method shows that the linear range is wide,the linear correlation is good,the detection line is low,and the reproducibility is good.The PAF-41 based HS-SPME/GC method was used to detect amphetamine and methamphetamine in urine.The results show that this method is sensitive and effective,without a derivation step,and suitable for the rapid detection of amphetamine and methamphetamine in urine.The PAF-41 coating was applied to extracted polar and non-polar aromatic organic compounds(AOCs)(polar amphetamine and methamphetamine and non-polar styrene,xylene and ethylbenzene).The extraction effects of PAF-41 coating were compared with commercial SPME fibers.The PAF-41 SPME coated fibers not only have better extraction capabilities for these AOCs than commercial SPME fibers,but also have versatility,and the extraction effect of methamphetamine is better than amphetamine.Second,we designed and successfully synthesized a novel non-interpenetraed three-dimensional diamond topology NIP-3D-COF.We used HS-SPME technology,using NIP-3D-COF coated fiber as the extraction fiber,combined with GC to establish a analysis method to detect five harmful phenols(o-cresol,2-chlorophenol,2,4-dimethylbenzene,2,4-dichlorophenol,2,4,6-trichlorophenol)in water.This analysis method shows that the linear range is wide,the linear correlation is good,the detection line is low,and the reproducibility is good.The NIP-3D-COF based HS-SPME/GC method was used to detect five phenols in environmental water,the result shows that the detection method was sensitive,effective,and suitable for the accurately detection of phenols in environmental water.The comparison experiment of the extraction effect of NIP-3D-COF coating on five phenols and commercial SPME fiber shows that the extraction effect of NIP-3D-COF coating is better than that of commercial SPME fiber.Due to the NIP-3D-COF molecular sieve effect and the electronic effect of the adsorbed substance substituents,the NIP-3D-COF coating has different extraction effects on different phenols.