Preparation method of TNT magnetic molecularly imprinted polymer microspheres

A magnetic molecular imprinting and polymer technology, applied in the field of nitro-based explosives detection, can solve the problems of difficult elution of template molecules, too deep embedding of binding sites, uneven binding sites, etc., and achieve good adsorption and separation. The effect of performance, uniform shape, and easy detection

Active Publication Date: 2018-09-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, TNT molecularly imprinted polymers prepared by traditional embedding methods have disadvantages such as too deep embedding of binding sites, uneven binding sites, difficult elution of template molecules, and difficulty in recombination.

Method used

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  • Preparation method of TNT magnetic molecularly imprinted polymer microspheres
  • Preparation method of TNT magnetic molecularly imprinted polymer microspheres
  • Preparation method of TNT magnetic molecularly imprinted polymer microspheres

Examples

Experimental program
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Embodiment 1

[0020] 1. Amino modified ferric oxide

[0021] First, prepare 150ml of ethanol: deionized water = 1:1 mixed solution, and place the solution in a 250ml three-neck round bottom flask. Use acetic acid to adjust the pH value of the appeal solution to 4, and accurately weigh 0.4g Fe 3 o 4 The nanoparticles are dispersed and mixed uniformly by ultrasonic in the above mixed solution. After the mixing is completed, place the flask in a water bath, stir rapidly with a stirring paddle, and add 0.5ml KH550 dropwise while stirring, deoxygenate the system with nitrogen for 10 minutes, and seal it with vacuum silicone grease. At 60°C, the reaction was stirred for 3h. After the reaction was completed, the nanoparticles were collected using a magnet, and the product was washed with deionized water several times until the pH of the eluate was neutral, and the product was vacuum-dried and collected for use.

[0022] 2. Synthesis of molecularly imprinted polymers on magnetic surfaces

[00...

Embodiment 2

[0043] 1. Amino modified ferric oxide

[0044] First, prepare 150ml of ethanol: deionized water = 1:1 mixed solution, and place the solution in a 250ml three-neck round bottom flask. Use acetic acid to adjust the pH value of the appeal solution to 3.7, and accurately weigh 0.42g Fe 3 o 4 The nanoparticles are dispersed and mixed uniformly by ultrasonic in the above mixed solution. After the mixing is completed, place the flask in a water bath, stir rapidly with a stirring paddle, and add 0.8ml KH550 dropwise while stirring, deoxygenate the system with nitrogen for 10 minutes, and seal it with vacuum silicone grease. At 60°C, the reaction was stirred for 4h. After the reaction was completed, the nanoparticles were collected using a magnet, and the product was washed with deionized water several times until the pH of the eluate was neutral, and the product was vacuum-dried and collected for use.

[0045] 2. Synthesis of molecularly imprinted polymers on magnetic surfaces

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Abstract

The invention discloses a preparation method of TNT magnetic molecularly imprinted polymer microspheres. The method comprises the steps of: firstly adopting 3-aminopropyltriethoxysilane to perform amination modification on surfaces of Fe3O4 nanoparticles, then dispersing the aminated Fe3O4 nanoparticles in acetonitrile, adding a template molecule TNT and functional monomer acrylamide, performing prepolymerization, adding a cross-linking agent ethylene glycol dimethacrylate and an initiator azobisisobutyronitrile so as to prepare magnetically imprinted polymer microspheres, and finally performing elution treatment on the microspheres to obtain the TNT magnetic molecularly imprinted polymer microspheres. By combining technologies of molecular imprinting with magnetic separation, the preparedpolymer particles have a uniform shape and uniform size, the specific surface area of the TNT molecularly imprinted polymer microspheres is increased, and good adsorption and separation performance are achieved, wherein the adsorption amount is about 2.6 times that of a traditional embedding method, the separation time is about 1/5 of that of the embedding method, and specific adsorption of TNT is achieved.

Description

technical field [0001] The invention belongs to the technical field of nitro explosive detection, and relates to a preparation method of TNT magnetic molecularly imprinted polymer microspheres. Background technique [0002] Trinitrotoluene (TNT) is a commonly used elemental explosive, which has stable physical and chemical properties, high explosive power, and low cost, and is widely used in military industry. TNT is highly toxic and difficult to degrade. The residual TNT in production and use places poses a huge threat to personnel health and environmental safety. It is very difficult to treat TNT that enters the soil and wastewater. Currently commonly used detection methods include activated carbon adsorption and degradation methods, etc., but these methods have low adsorption efficiency and the adsorbent is difficult to regenerate. [0003] Molecularly Imprinted Polymer (MIP) refers to a polymer material prepared by molecular imprinting technology that can selectively re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F222/14C08F2/44C08K9/06C08K3/22B01J20/281
CPCB01J20/281C08F2/44C08F220/56C08K3/22C08K9/06C08K2003/2275C08K2201/011C08F222/102C08F222/14
Inventor 饶国宁郭建良吴萍任家帆
Owner NANJING UNIV OF SCI & TECH
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