Preparation Of New Organic Polymer Materials And Their Applicationsto Separation Of Organic Pollutants

In this dissertation,two kinds of new organic polymer materials were prepared and applied to the separation of organic pollutants.The detailed contentsare shown as follows:First,according to the previous reports,the pillar[5]arene was preparedusing 1,4-dimethoxybenzene,paraformaldehyde and boron tribromide as reagents,and the magnetic cellulose particles(M-C)were synthesized.Then,the magnetic pillar[5]arene polymer(M-P5AP)was obtained by grafting pillar[5]arenepolymer on the surface of the M-C particlesunder alkaline conditionusingtetrafluoroterephthalonitrileas corss-linker.The obtainedM-P5A-P was characterized byFT-IR spectroscopy,thermogravimetric analysis(TGA),energy dispersive Xray spectroscopy(EDX),transmission electron microscope(TEM),nitrogen adsorption test,Xray diffraction(XRD),magnetic hystersis loop analysis.The adsorption ability of M-P5A-P forfour different types of organic pollutants(BPA,1-NA,propanolol,MB)was investigated,and the adsorption ability of M-C was also studied for comparison Adsorption experiments showed that the M-P5A-P has a higher adsorption ability for four pollutants than M-C and can reachkinetic binding equilibrium within 10 minutes.In addition,the reusability and reproducibility of the M-P5A-P were also evaluated.Results showed that the adsorption ability of M-P5A-P presented no significant change after six adsorption cycles,and three different batches of M-P5A-P showed almost same adsorption ability,indicating that the M-P5A-P has good reusability and reproducibility.Moreover,the rapid adsorption ability of M-P5A-P for mixed pollutants was also studied.Results presentedthat the adsorption efficiencies of BPA,1-NA,propranolol and MB on M-P5A-P were 98.26,87.47,82.30 and 99.44%,respectively.Finally,the adsorption ability of M-P5A-P for volatile organic compounds was evaluated.When M-P5A-P was exposed to 958 ppm styrene,the adsorption equilibrium can be reached within 8 minutes,and the vapor pressure of styrene reached 532 ppm in 4 minutes,which ismuch lower than the standard(600 ppm)set by the OSHA.Second,two monomers,1,3,5-tris(4-aminophenyl)benzene(TABPB)and2,5-divinylterephthalaldehyde(DVA),were synthesized according to our previous method and that in literature,resepctively.Then,usingTABPB and DVA as monomers,an ionic liquid as catalyst and dimethyl sulfoxide as solvent,a covalent organic framework(COF)-based capillary monolithic column was prepared in the presence of cross-linking agent,initiator andporogen.Then,it was characterized byFT-IR and SEM.For the preparation,the reaction time and monomer ratio were optimized.The results showed that,after0.07 mmol of DVA and 0.0467 mmolof TABPB were added and kept at room temperature for 36 h,the monolithic column showed the best permeability.In addition,the COF capillary monolithic column was used as electrochromatographic column for the separation of severalaromatic hydrocarbons.The separation conditions were optimized includingthe content of acetonitrile andacidity in buffer and the sample concentration.The experimental results showed that the buffer containing 60% of acetonitrile with pH value of 7.5 can be used for the base-line separation of the sample mixture containing 3.48 mg/mL of benzene;3.44 mg/mL oftoluene;3.4 mg/mLofethylbenzene,3.44 mg/mL of propylbenzene and 3.44 mg/mL ofbutylbenzene.In this work,a method for the in-situ preparation of COF-based capillary monolithic column was developed for the first time.This method can avoid the advantages of the existing COF capillary monolith including the tedious and time-consuming preparation procedure and ir-realizability of synthesizing the small-diameter capillary monolithic column.This work also provides the possibility of the COF monolith for CEC,on-line solid-phase extraction and micro-HPLC in practical application.