Synthesis And Properties Of The Bifunctional Mesoporous Materials

We designed and synthesized the bifunctional mesoporous materials with twofunctional groups on the channel surface. The bifunctionalized materials showadvantages in adsorption, catalysis, and drug delivery.Cooperative adsorbents, designed on the basis of molecular structural features oftargeted pollutant, were made by simultaneous grafting of two different organicfunctional groups on mesoporous SiO₂material SBA-15for removal of lowconcentration organic pollutants in water. Compared with the monofunctionalizedadsorbents and their physical mixtures, the cooperative adsorbents show much higheradsorption capacity and efficiency for model pollutants at low concentration. Themaximal adsorption amounts of eosin,4-nonylphenol and di-n-butyl-phthalate are0.59,1.49, and1.56mmol·g^-1on corresponding cooperative adsorbents, respectively.Especially,99.95%of eosin can be removed from an aqueous solution in lowconcentration. The experimental results confirm that the cooperative effect of the twofunctional groups on the same solid surface leads to excellent adsorption performanceof bifunctionalized adsorbents.Acid-base bifunctional catalysts based on mesoporous polymers weresynthesized. The catalytic activities of the bifunctional catalysts were evaluated in atandem reaction involving the hydrolysis of an acetal and subsequent Henry reaction.The yields of2-nitrovinyl benzene were98%and99%, respectively. The catalysts doalmost no loss in activity after three runs. Our results indicate that mesoporous polymers are the excellent carriers of bifunctional catalysts.Acid-base bifunctional catalyst based on MOFs was made by post-synthesizedmodification of MOF_s on organic ligand and coordinatively unsaturated metal central,respectively. The bifunctionalized MOFs catalyst was successfully applied to one-pottandem reaction. The conversion of benzaldehyde dimethyl acetal was100%, and theyield of2-nitrovinyl benzene was97%. The catalyst showed almost no loss in activityduring the three runs. Our results indicate that the bifunctional catalyst can beextended to non-oxide materials.A bifunctionalized carrier was designed and synthesized containing fluorescentmolecular rotors and organic ammonium groups. The load and release of drugrevealed that the emission intensity of molecular rotors increases with an increase inthe amount of naproxen-loaded MR/NTMPS-SBA-15. Our results indicate that thecarrier with molecular rotors can be used as a probe for tracking and monitoring drugrelease by PL intensity.