Bbb Study On Adsorption Of Phenol In Tobacco Smoke By Mesoporous Carbons And Molecular Imprinted Polymers

In this thesis, the synthesis and application of the ordered mesoporous carbon materials, the development and application of molecular imprinting technique and the methods of reducing the phenol content in smoke were reviewed in detail. Then highly ordered mesoporous carbon (OMC) with complementary pores was prepared by evaporation induced triconstituent coassembly method, the adsorption isotherms and kinetics of phenol onto OMC prepared were studied. Next, the recognition mechanism between phenol and 4-Vpy and the binding addinity of the MIP were studied. Finally, the OMC and different silica additives showing specific affinity for phenol were prepared by modificating silica with polyether-imide (PEI), hexadecyl trimethyl ammonium bromide (CTMAB) and molecular imprinted polymer (MIP). The adsorption and selectivity ability of the additives for phenol in the cigarette smoke were researched by adding each kind additive with different ammount into the cigarette filter. Primary studies in the thesis are included as following:1. The highly ordered mesoporous carbon (OMC) with complementary pores have been successfully synthesized by the evaporation induced triconstituent coassembly method, wherein soluble resol polymer is used as an organic precursor, prehydrolyzed TEOS is used as an inorganic precursor, and triblock copolymer F127 is used as a template. The textural characterization of the prepared OMC was carried out by TEM, XRD and N2 adsorption. For the first time, the application as a sorbent was demonstrated by using phenol as model compound at different initial concentrations and different contact time intervals. The equilibrium and kinetic data were fitted to different models then evaluated to study the adsorption process of phenol on the prepared OMC. The results showed that equilibrium data were best described by the Langmuir isotherm model. Meanwhile, the adsorption kinetics data were best represented to the pseudo-second-order kinetic model.2. The molecularly imprinted polymer (MIP) with high selectivity and affinity for phenol based on non-covalent interaction was synthesized using phenol as template molecules, 4-vinyl pyridine (4-Vpy) as functional monomers, azobisisobutyronitrile (AIBN) as initiator and ethylene glycol dimethacrylate (EGDMA) as crosslinker. UV, IR and 1H NMR spectrometric methods were used to study the interactions and recognition mechanism between phenol and 4-Vpy. The results demonstrated that the phenol-4-Vpy complexes of 1:1 mole ratio were obtained by hydrogen bonding. Hydrogen atom of the hydroxyl in phenol was hydrogen-bond donor and nitrogen atom in 4-Vpy was hydrogen-bond acceptors.3. Firstly, the OMC was prepared by the method of evaporation induced triconstituent co-assembly; Then the different silica additives showing specific affinity for phenol were prepared by modificating silica with PEI, CTMAB and MIP. The adsorption and selectivity ability of the additives for phenol in the cigarette smoke were researched by adding each kind additive with different ammount into the cigarette filter. The results indicated that all of the additives including OMC, PEI-SiO2, CTMAB-SiO2, MIP-SiO2 possessed strong adsorption and selectivity ability for phenol. The least reduced rate of phenol could reach to 39% when the adding amount of the additives was 20 mg/cig.