Research On The Preparation And Application Of Supramolecular Nanosponge And Its Magnetic Nanocomposites

Chapter Ⅰ: The classification,structure,preparation,characterization and applications of supramolecular polymer and supramolecular nanosponges have been briefly reviewed in this chapter.Chapter Ⅱ: Linear maltodextrin supramolecular nanosponge（LM-NS 7 and 8）were prepared according to direct crosslinked method.The particle size and morphology of LM-NS 7 and 8 were characterized by dynamic light scattering,optical microscopic and scanning electron microscope.These results indicate that the phase evolution is a continuous growth process,in which the size of aggregates gradually increases to form precipitates,which further adhere to afford the flowing gel and rigid gel.Enantiodifferentiating photoisomerization of 1Z to chiral 1E sensitized by LM-NSs 7 and 8 in various phases have been developed in aqueous media,which detected by GC.The %ee of which shows a rather flat profile in the sol to flowing gel region but abrupt change（s）in the rigid gel phase,i.e.a sudden drop.These %ee profiles have disclosed the nominal contribution of the host cavity/concave to the photochirogenesis in NS but instead highlighted the more crucial roles played by the phase-responsive chiral void space created in crosslinked oligosaccharide polymers.Chapter Ⅲ: LM-NS 1-3 and LM-NS 1-6 have been prepared by linear maltodextrin crosslinked with pyromellitic dianhydride at 1:3 and 1:6 mol ratios.The LM-NS 1-3 and LM-NS 1-6 were characterized by SEM,TGA,FTIR,zeta potential and N2 adsorption–desorption isotherms.The adsorption capabilitie of LM-NS 1-3 for basic fuchsin（BF）、methyl violet（MV）、ethyl violet（EV）、methyl green（MG）and malachite green（MAG）have been detected by UV-Vis spectroscopy method.The adsorption rate of these five dyes reached an invariant rate after 5 min,and their adsorption efficiency were both up to 95%.The maximum adsorption capabilities for BF、MV、EV、MG and MAG could reach up to 819.7、751.9、666.7、1043.5 and 543.5 mg/g,respectively.There was no significant influence of the adsorp-tion capacity at the wide range of pH 3-9,but the obvious reducing with the increases of ion strength.Additionally,a good recyclability of the LM-NS 1-3 was observed over five usage cycles,with only a slight decline in adsorption capability.Chapter Ⅳ: β-cyclodextrin Nanosponge（β-CDNS-MNPs）functionalized Fe₃O₄ magnetic particleshave been prepared with a one-step co-precipitation method by anchoring a β-cyclodextrin Nanospong（β-CDNS）onto the surface of Fe₃O₄ magnetic nanoparticles（MNPs）.The β-CDNS-MNPs have been characterized by optical microscopic,TGA,FTIR,XRD and VSM.Using malachite green（MAG）as the model dye pollutant,the adsorption behavior of β-CDNS-MNPs for MAG has been studied by UV-Vis spectroscopy method.The maximum adsorption capability for MAG could reach up to 83 mg/g,and the adsorption model was fit for monolayer Langmuir model.The effects of pH and ion strength on adsorption were also investigated.There was no significant influence of the adsorption capacity with the increases of ion strength.But the enhancement of adsorption capacity with the increased of pH may be attributed to the aggregation of magnetic nanoparticles in acid condition.