Carbon nanotube-based magnetic organophosphorus molecularly-imprinted polymer and its preparation method and use
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A technology of carbon nanotubes and molecular imprinting, which is applied in the field of separation analysis, can solve the problems of poor applicability of polymers, time-consuming pretreatment technology, and large consumption of organic solvents, so as to achieve good selectivity, shorten extraction and purification time, and avoid matrix impurities. interference effect
Inactive Publication Date: 2014-01-08
NORTHEAST FORESTRY UNIVERSITY
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[0004] The purpose of the present invention is to solve the relatively poor dispersion properties of existing molecularly imprinted polymers, the poor applicability of the method for preparing polymers, the time-consuming sample pretreatment technology of the polymer used as an...
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specific Embodiment approach 1
[0029] Embodiment 1: A carbon nanotube-based magnetic organophosphorus molecularly imprinted polymer of this embodiment includes carbon nanotubes, FeCl 3 ·6H 2 O, crosslinking agent and functional monomer.
[0030] The beneficial effect of this implementation mode:
[0031] In the present invention, carbon nanotubes are selected as the carrier, so that the final magnetic molecularly imprinted polymer has good dispersion properties.
specific Embodiment approach 2
[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the crosslinking agent is ethylene glycol dimethacrylate or trimethylolpropane trimethacrylate; the functional monomer For methacrylic acid, acrylamide or 4-vinylpyridine. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0033] Specific embodiment three: In this embodiment, a method for preparing a carbon nanotube-based magnetic organophosphorus molecularly imprinted polymer is carried out according to the following steps:
[0034]1. Mix carbon nanotubes and concentrated nitric acid evenly at a ratio of mass to volume of 0.8g: 100-200mL, stir the mixture magnetically in an oil bath at 80-90°C for 5-7 hours, and then activate the activated Wash the carbon nanotubes until they are neutral, and dry them at 50-70°C to obtain a powdery substance;
[0035] 2. Combine 0.3-0.6g of the powdered substance obtained in step 1 and 1.0-1.8g of FeCl 3 ·6H 2 O Mix evenly to obtain a mixture, add 60-100mL ethylene glycol solvent to the mixture, stir in an oil bath at 80-90°C until FeCl 3 ·6H 2 After O is completely dissolved, add 3.4~3.8g of sodium acetate, stir until the sodium acetate is completely dissolved, then stir for 2~3min, then transfer to the reaction kettle, and put the reaction kettle in an ove...
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Abstract
The invention discloses a carbon nanotube-based magnetic organophosphorus molecularly-imprinted polymer and its preparation method and use, and relates to a molecularly-imprinted polymer and its preparation method and use. The carbon nanotube-based magnetic organophosphorus molecularly-imprinted polymer and the preparation method solve the problem that the existing molecularly-imprinted polymers have poor dispersibility, the existing molecularly-imprinted polymer preparation method has poor applicability, and in use of the existing molecularly-imprinted polymers as adsorbents in sample pre-treatment in organophosphorus pesticide residue analysis, operation time is long and organic solvent consumption is large and selectivity is poor. The carbon nanotube-based magnetic organophosphorus molecularly-imprinted polymer comprises carbon nanotubes, FeCl3.6H2O, a cross-linking agent and a functional monomer. The preparation method comprises the following steps of 1, activating the carbon nanotubes, 2, adding FeCl3.6H2O into the activated carbon nanotubes, carrying out treatment and carrying out magnetic substance collection, 3, carrying out dispersion and adding tetraethyl orthosilicate into the dispersed system, 4, carrying out dispersion and carrying out magnetic substance collection, 5, preparing a magnetic molecularly-imprinted polymer having a template molecule, and 6, treating the magnetic molecularly-imprinted polymer to obtain the carbon nanotube-based magnetic organophosphorus molecularly-imprinted polymer. The carbon nanotube-based magnetic organophosphorus molecularly-imprinted polymer as an adsorbent can be used for selective extraction separation of organophosphorus pesticide residues in a complex sample.
Description
technical field [0001] The invention relates to the technical field of separation and analysis, in particular to molecularly imprinted polymers and their preparation methods and applications. Background technique [0002] Organophosphorus insecticides are widely used in the prevention and control of agricultural and urban pests. They have contact killing, stomach poisoning and fumigation effects, and can be effectively used to control vegetables, rice, wheat, corn, cotton, sugar cane, tea, fruit trees, flowers More than 100 kinds of pests such as stem borers, leaf rollers, armyworms, scale insects, aphids, leafhoppers, and pest mites have been registered in many countries and regions, and the use volume and application range are constantly increasing. However, eating food containing organophosphorus pesticides, such as vegetables, will bring harm to people's health. Nowadays, the detection technology of pesticide residues in food is constantly improving, but the pretreatmen...
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