Study Of Novel Molecular Imprinting Technique And Application Of Organo-Bentonite In Water Treatment

Molecular imprinting, a novel technology mimicking the 'lock-to-key'phenomenon which happens between antigen and antibody when they interact inbiology, is performed by polymer with 'predetermined'molecule recognition to theimprinted molecule, it has been found wide applications as selective adsorbents forenantiomer separation, solid phase extraction, biomimic sensors, catalysis and so on.To traditional molecular imprinting, imprint molecule mostly complexed withfunctional monomer by non-covalent interactions such as ion bonds, hydrogenbonds, hydrophobic interactions, van der Waals forces and so on. The selectivity ofsuch molecularly imprinted polymer is poor. Moreover, molecularly imprintedpolymers are prepared in weak-polar organic solvent presently. Therefore, it isurgently necessary to improve the selectivity of molecularly imprinted polymer andto prepare it in polar solvent. In order to resolve these problems, in this thesis, metalcoordination-chelation interaction was used as the interaction between imprintmolecule and functional monomer, and metal-complexing imprinted polymers withhigh selectivity were prepared in polar solvent. By optimizing the preparationconditions, the negative effects, which were produced by introducing metal ion intothe polymerization system, were reduced. Enantioseparation of imprint moleculewas obtained firstly when metal-complexing imprinted polymers were used directlyas HPLC stationary phase. Various factors that affect the selectivity ofmetal-complexing imprinted polymer in preparation and recognition wereinvestigated systemically and the interaction mechanism was discussed. It wasdefinitely pointed out that specific metal coordination-chelation interaction andspecific hydrophobic interaction between imprint molecules and recognition siteswithin the polymer resulted in the selective recognition. The applications of molecularly imprinted polymers to separate or extract theimprint molecules from gas or aerosol are scarce. In this thesis, the feasibility wasexhibited to remove nicotine from tobacco smoke using nicotine-imprinted polymeras solid-phase extraction sorbent. It was found that the removal efficiency bynicotine-imprinted polymer was higher than that by the filter tip. In addition, in this thesis, the application of organo-bentonite in wastewatertreatment was discussed. Organo-bentonite was prepared by processing, whichfacilitated bentonite to be separated from water, and modifying natural bentonite bycation surfactant, CTMAB. The preparation conditions were optimized and theability of organo-bentonite to remove nonpolar organic compounds and inorganicoxysanions in water was investigated. Compared to natural bentonite, the ability oforgano-bentonite to remove nonpolar organic compounds (BETX) and inorganicoxysanions (CrO4 ) was greatly enhanced. 2-...