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HMS mesoporous materials based on molecularly imprinted Preparation and adsorption properties of materials

Author: ZhengYi
Tutor: WangYan
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: HMS 2,4 - dichlorophenoxyacetic acid Methyl orange Imprinted Mesoporous materials
CLC: O631.3
Type: Master's thesis
Year: 2010
Downloads: 210
Quote: 0
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Abstract


Mesoporous materials with larger aperture rules and high specific surface area, as a carrier of molecular imprinting point, help accelerate the speed of adsorption and separation of molecular imprinting can make a lot of imprinting on the pore walls of mesoporous materials in order to achieve the point fast recognition process and obtain a high adsorption capacity. First, with dodecylamine (DDA) as surfactant template optimized synthetic conditions are well-pure silicon mesoporous HMS, and the synthesis of HMS by introducing a certain percentage of precursor amino silane functional monomer, and add a blot template molecules, the use of the template molecule and the role of amino functional groups, to achieve the formation of pores in the wall of the hole forming a specific recognition point. In this process, not only retains the pore structure of mesoporous materials, but also in the role of the pore walls form a rich point. Then 2,4 - dichlorophenoxyacetic acid (2,4-D) and dodecylamine (DDA), respectively, and a surfactant template imprinted 3 - aminopropyl triethoxysilane (APTES) as a function of monomer, tetraethoxysilane (TEOS) as a coupling agent by sol-gel method, preparation of 2,4-D in HMS mesoporous molecular imprinted polymers. The effects of different functional monomer content, the type of template is added in order to influence the performance of the adsorbent prepared; analyzed surfactant effect of this. The experimental results showed that: a guide surface active agent formed under DDA imprinted adsorbent material has good accessibility adsorption point, to quickly reach equilibrium; proportion of functional monomers in the appropriate APTES content can reach higher adsorption capacity ( 40mg / g); even in the presence of 2,4 - dichlorophenoxyacetic acid structure similar to 2,4 - dichloro-phenol in the presence of 2,4 - dichlorophenoxyacetic acid still have a high selective adsorption capacity; N2 adsorption-desorption and small angle XRD analysis showed that the molecular imprinted material prepared with rich ordered mesoporous pore structure and high specific surface area. Then methyl orange as the template molecule, in accordance with the 2,4-D molecular imprinted material preparation process, methyl orange prepared mesoporous molecular imprinted polymers. By adjusting the template molecule and the ratio of solvent water content, the more excellent adsorption performance prepared methyl orange imprinted material. By adding the DDA DDA imprinted material imprinted with and without added material adsorption performance comparison analysis, study DDA during the preparation of the material on the adsorption properties; and compared between the non-imprinted and imprinted material differences between the adsorption properties.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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