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Method for preparing silica gel surface phenols molecularly imprinted polymer

A technology of molecular imprinting and polymers, applied in chemical instruments and methods, and other chemical processes, can solve the problems of low molecular weight of functional macromolecules, low grafting rate of imprinted materials, and low content of functional groups, etc., and achieve excellent adsorption options properties, easy adsorption equilibrium, and low diffusion resistance

Inactive Publication Date: 2009-05-06
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In order to solve the problems of low functional macromolecule molecular weight, low functional group content, low utilization rate, low grafting rate, small adsorption capacity, and poor mechanical stability of the obtained imprinted materials in the existing silica gel surface imprinted polymers, the present invention provides A kind of preparation method of phenolic molecularly imprinted polymer on the surface of silica gel

Method used

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  • Method for preparing silica gel surface phenols molecularly imprinted polymer
  • Method for preparing silica gel surface phenols molecularly imprinted polymer
  • Method for preparing silica gel surface phenols molecularly imprinted polymer

Examples

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Embodiment 1

[0021] A method for preparing a phenolic molecularly imprinted polymer on the surface of silica gel, comprising the following steps: (1) Activation of silica gel: adding 5 g of silica gel to 30 mL of 5% hydrochloric acid aqueous solution, stirring and activating at 90° C., after 4 hours of activation , filter, fully wash the filter cake with distilled water, and finally vacuum-dry it in a vacuum oven for 24 hours to obtain activated silica gel; (2) chemically bonded alkyl halides on the surface of silica gel: add 5 g of activated silica gel to a 100 mL four-necked flask , then add 40mL toluene and 1mL water as solvent and stir, then add 10mL γ-chloropropyltrimethoxysilane, react at 70°C for 6h, after the reaction, extract the product with toluene in a Soxhlet extractor for 24h, remove The unreacted silane coupling agent in the system is finally vacuum-dried in a vacuum oven for 24h to obtain chloropropylated silica gel (CP-SiO 2 ); (3) chemical grafting of polyethyleneimine PE...

Embodiment 2

[0034] A method for preparing a phenolic molecularly imprinted polymer on the surface of silica gel, comprising the following steps: (1) Activation of silica gel: adding 10 g of silica gel to 60 mL of 20% hydrochloric acid aqueous solution, stirring and activating at 90° C., after 8 hours of activation , filtered, and the filter cake was fully washed with distilled water, and finally vacuum-dried in a vacuum oven for 30 hours to obtain activated silica gel; (2) chemically bonded alkyl halides on the surface of silica gel: add 10 g of activated silica gel to a 100 mL four-necked flask , then add 60mL of xylene and 5mL of water as solvent and stir, then add 15mL of γ-bromopropyltrimethoxysilane, react at 80°C for 8h, after the reaction, extract the product with toluene in a Soxhlet extractor for 30h, Remove the unreacted silane coupling agent in the system, and finally vacuum-dry it in a vacuum oven for 30 hours to obtain bromopropylated silica gel; (3) chemically graft polyethyl...

Embodiment 3

[0036] A method for preparing a phenolic molecularly imprinted polymer on the surface of silica gel, comprising the following steps: (1) Activation of silica gel: adding 5 g of silica gel to 50 mL of 15% hydrochloric acid aqueous solution, stirring and activating at 90° C., after 8 hours of activation , filtered, and the filter cake was fully washed with distilled water, and finally vacuum-dried in a vacuum oven for 30 hours to obtain activated silica gel; (2) chemically bonded alkyl halides on the surface of silica gel: add 5 g of activated silica gel to a 100 mL four-necked flask , then add 50mL of organic solvent and 1mL of water as solvent and stir, then add 10mL of γ-iodopropyltrimethoxysilane, react at 85°C for 7h, after the reaction, extract the product with toluene in a Soxhlet extractor for 30h, Remove the unreacted silane coupling agent in the system, and finally vacuum-dry it in a vacuum oven for 24h to obtain iodopropylated silica gel; (3) chemically graft polyethyl...

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Abstract

The invention relates to a method for synthesizing surface molecular engram materials, in particular to a method for preparing phenol molecular engram polymers on the surface of silica gel, which solves the problems in the prior surface molecular engram polymers of low molecular weight of functional macromolecules, low content of functional groups, low grafting percent of engram materials and so on. The method comprises the following steps: firstly, the silica gel is activated, reacts with a coupling agent, and reacts with a polymine aqueous solution; secondly, the surface of the silica gel is chemically grafted with polymine to prepare a grafting material PEI / SiO2; thirdly, the grafting material PEI / SiO2 which absorbs template molecules to be balanced is added into an ethanol aqueous solution of a crosslinking agent for reaction; and fourthly, reacted materials are repeatedly washed by a hydrochloric acid for removal of the template molecules, washed by distilled water to neutralization, and subjected to vacuum drying. The preparation process is simple, and the silica gel surface engram materials prepared have high absorption capacity and superior absorption selectivity on the template molecules, have actuating locus inside silica gel surface polymer films, have small diffusion resistance and quick mass transfer speed, and are easy to achieve absorption equilibrium.

Description

technical field [0001] The invention relates to a method for synthesizing a molecularly imprinted material, in particular to a method for preparing a phenolic molecularly imprinted polymer on the surface of silica gel. Background technique [0002] Phenolic substances are a kind of persistent organic pollutants, which are widely found in the sewage of pharmaceutical, dye, photographic and agricultural chemical industries, and are extremely harmful to humans and other organisms such as teratogenic, carcinogenic, and mutagenic. Due to its high toxicity and the ability to accumulate in the environment without being easily decomposed, phenolic pollutants have caused a series of environmental problems, and the U.S. Environmental Protection Agency has listed them as primary pollutants. [0003] At present, there are mainly the following methods for the treatment of phenol-containing wastewater at home and abroad. Inorganic porous materials such as activated carbon and bentonite an...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08J3/24C08J9/26B01J20/26B01J20/30
Inventor 安富强高保娇冯晓琴杜瑞奎
Owner ZHONGBEI UNIV
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