Preparation And Absorption Properties Of Molecular Imprinted Materials Based On HMS Mesoporous Materials

Mesoporous materials with larger pore size and high specific surface area, as the carrier of molecular imprinting point position, are conducive to speed up the rate of adsorption and separation. Molecular imprinting can make a lot of imprinting sites on the pore walls of mesoporous materials, in order to achieve rapid identification process and obtain high adsorption capacity.First dodecylamine (DDA) came to the surface active agent for the template, optimizing synthesis conditions are well-structured pure silicon-based mesoporous HMS, then HMS precursor in the synthesis to introduce a certain proportion of amino silane functional monomer, and add some imprinted template, use the template molecule and the role of amino functional groups to achieve in the pore formation process, the formation of the pore walls of the identification points are given. In this process not only retains the pore structure of mesoporous materials, but also rich in the hole wall forming the role of point position.2,4-dichlorophenoxyacetic acid (2,4-D) and dodecylamine (DDA) were imprinted and surfactant template, 3-aminopropyl triethoxysilane (APTES) as a functional single body, TEOS (TEOS) as a coupling agent, by sol-gel method, preparation of 2,4-D of HMS mesoporous molecular imprinted polymer. The influence of different functional monomer content, add a different template sequence on the properties of adsorbent prepared; and analysis of surfactants in this role. The results show that: Surfactants formed under the DDA oriented imprinted adsorbents adsorption point and has good accessibility, quickly reached equilibrium; in an appropriate proportion of functional monomer APTES content can reach a higher adsorption amount (40mg /g); even with the 2,4-dichlorophenoxyacetic acid structurally similar 2,4-dichlorophenol, 2,4-dichlorophenoxyacetic acid still had a higher adsorption selectivity; the presence of surfactant DDA help increase the specific surface area adsorbent prepared; proper proportion of functional monomer APTES help achieve higher levels of adsorption quantity; N2 adsorption and small angle XRD test showed that the prepared molecularly imprinted materials have rich ordered mesoporous pore structure and high specific surface area.Then methyl orange as the template molecule, according to the preparation of 2,4-D molecular imprinted materials prepared methyl orange mesoporous molecular imprinted polymer. By adjusting the template molecule and the solvent ratio of water content, we got the more excellent preparation adsorption of methyl orange molecularly imprinted materials. The imprinted materials by adding DDA with the imprinted materials without adding DDA adsorption compared to study the process of DDA in materials on the adsorption properties, and compared between the non-imprinted and imprinted material difference between the adsorption properties.