Novel Porous Organic Polymers:Synthesis,Characterization And Applications For Colorimetric Sensing And Antimicrobial

With the development and progress of economy,the demand and people's dependence for materials are increasing,especially porous materials,which are more and more widely used in daily life.Specifically,porous organic polymers have been widely concerned and become a new star of the era.In generally,porous organic polymers are connected by covalent bonds through small organic molecular units,owning modifiable skeleton structure,abundant surface catalytic sites,which have attracted widespread attention.So far,porous organic polymer materials have been widely used in pollutant disposal,heterogeneous catalysis,construction of sensors and other fields.In addition,the treatment of environmental pollution has always been an important topic of concern to scientists.For example,hydrogen sulfide gas emitted by food,leather and other industries has always affected our living environment,and wound infection caused by bacteria has always threatened human health.Based on the above background,two kinds of porphyrin-based porous organic polymer materials,namely FePPOPEPA and FePPOPHydantoin,were designed and synthesized in this paper,and their applications in sulfur ion detection and antibacterial were explored,respectively.Specific research contents are as follows:A novel porous organic polymer based on iron porphyrin,FePPOPEPA,was synthesized by Sonogashira coupling reaction between tris(4-ethynyphenyl)amine(EPA)and 5,10,15,20-tetra(4-bromophenyl)iron porphyrin(FeTBrPP).FePPOPEPA was characterized by FTIR,solid state NMR,TGA and nitrogen adsorption and desorption.The results show that FePPOPEPA has high specific surface area and multi-stage pore structure.Using 3,3',5,5-tetramethylbenzidine(TMB)as substrate,FePPOPEPA exhibited good peroxidase-like catalytic activity,and a colorimetric sensor was constructed for the quantitative detection of sulfur ions in solution.In order to expand its application value,we have designed and completed the testing of actual samples and also have maken it into a test paper,and have successfully realized the detection of sulfur ions,and explored its detection mechanism.FePPOPHydantoin,a novel antimicrobial agent,was successfully synthesized from 1,3-dibromo-5,5,-dimethylhydantoin and 5,10,15,20 tetra(4-bromophenyl)iron porphyrins(FeTBrPP)under the protection of nitrogen gas by Yamamoto coupling reaction in glove box.The FePPOPHydantoin was characterized by scanning electron microscopy,solid state NMR,thermogravimetric analysis,UV diffuse reflection and Zate potential.The results show that FePPOPHydantoin is a kind of nanometer enzyme with high specific surface area,high thermal stability,wide near-infrared red(NIR)absorption band and positive point on the surface.We studied the Photo-fenton activity and chemical antibacterial activity of FePPOPHydantoin,found FePPOPHydantoin can convert H2O2 into reactive oxygen with strong oxidation,and retain the chemical antibacterial ability of Hydantoin under NIR.The results proved that FePPOPHydantoin is an antimicrobial agent with synergistic antibacterial effect.The antibacterial efficiency of FePPOPHydantoin reached 99.999%.In addition,we also explored the antimicrobial mechanism of FePPOPHydantoin in this paper.