Method for preparing magnetic halloysite molecularly imprinted polymer with specific adsorption to 2,4-dichlorophenoxyacetic acid

A dichlorophenoxyacetic acid, molecular imprinting technology, applied in chemical instruments and methods, other chemical processes and other directions, can solve the problems of time-consuming, laborious, and low removal efficiency of removal methods, achieve good reusability, and be conducive to repeated service life. , The effect of high-efficiency selective separation

Active Publication Date: 2014-03-05
CENT SOUTH UNIV
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  • Description
  • Claims
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Problems solved by technology

[0006] The present invention aims at the defects of time-consuming, laborious and low removal efficiency in the removal method of 2,4-dichlorophenoxyacetic acid (2,4-D) in the traditional environmental system in the prior art, and aims to provide a stable structure, A method for preparing a magnetic halloysite molecularly imprinted polymer that has specific adsorption for 2,4-D and can effectively separate and remove 2,4-D in a complex system. The preparation method has cheap raw materials, simple operation, and easy implementation

Method used

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  • Method for preparing magnetic halloysite molecularly imprinted polymer with specific adsorption to 2,4-dichlorophenoxyacetic acid
  • Method for preparing magnetic halloysite molecularly imprinted polymer with specific adsorption to 2,4-dichlorophenoxyacetic acid
  • Method for preparing magnetic halloysite molecularly imprinted polymer with specific adsorption to 2,4-dichlorophenoxyacetic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Co-precipitation method to prepare corroded magnetic halloysite nanotubes (HNTS-Fe 3 o 4 )

[0040] Disperse 2g of halloysite nanotube particles in 100mL of 2mol / L dilute sulfuric acid solution, stir magnetically in a 60°C water bath for 12h after ultrasonication, filter, wash with a large amount of distilled water until PH = 7, and dry under vacuum at 50°C to obtain a partially corroded inner wall Corroded halloysite nanotubes (HNTS) after expansion.

[0041] Corroded halloysite nanotubes, anhydrous ferric chloride, and ferrous chloride tetrahydrate were dissolved in 200mL deionized water according to the mass ratio of 0.2:0.69:0.51, and 5wt% (based on the total mass of the mixture) of polyethylene After the alcohol (PVA) is ultrasonically dispersed, under the protection of nitrogen, stir magnetically in a water bath at 60°C for 1 hour; add 12 mL of concentrated ammonia water to the above mixture dropwise, and control the dropping time for 30 minutes, then adjust...

Embodiment 2

[0051] (1) Co-precipitation method to prepare corroded magnetic halloysite nanotubes (HNTS-Fe 3 o 4 )

[0052] Disperse 2g of halloysite nanotube particles in 100mL of 2mol / L dilute sulfuric acid solution, ultrasonically stir in a water bath at 60°C for 12h, filter, wash with a large amount of distilled water until pH = 7, and dry under vacuum at 50°C to obtain the inner wall part Corroded halloysite nanotubes (HNTS) expanded after etching.

[0053] Corroded halloysite nanotubes, ferric chloride hexahydrate, and ferrous sulfate heptahydrate were dissolved in 200 mL of deionized water according to the mass ratio of 0.25:0.466:0.3, and 5 wt % (based on the total mass of the mixture) of polyethylene glycol was added. Alcohol 2000 (PEG-2000) was ultrasonically dispersed, and then magnetically stirred in a 50°C water bath for 1 h under nitrogen protection; 12 mL of concentrated ammonia water with a volume fraction of 28% was added dropwise to the above mixture, and the dropping t...

Embodiment 3

[0061] The adsorption amount detection of the magnetic halloysite nano-molecularly imprinted polymer of Example 1: the process is as follows: put 5 mg of the magnetic halloysite nano-molecularly imprinted polymer of Example 1 into 5 mL of substrate with a concentration of 80 mg / In the 2,4-D solution of L, put it on a rotary shaker and oscillate to mix well. During the oscillation process, use a magnet at different time intervals of 5min, 10min, 15min, 20min, 30min, 40min, 50min, 60min, and 80min. Separation, take the supernatant, test the absorbance to calculate the concentration after adsorption equilibrium, according to the concentration difference before and after according to the formula Q e =(C o -C e )×V / m, where C o and C e is the initial concentration of 2,4-D and the concentration after adsorption, V is the solution volume, and m is the mass of polymer adsorption material. Depend on Figure 4 It can be seen that the adsorption time can reach the adsorption equil...

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Abstract

The invention discloses a method for preparing a magnetic halloysite molecularly imprinted polymer with specific adsorption to 2,4-dichlorophenoxyacetic acid. The preparation method comprises the following steps: preparing magnetic halloysite nano-tubes by using corroded halloysite nano-tubes by a coprecipitation method; reacting the magnetic halloysite nano-tubes and methacrylate in methylbenzene to obtain magnetic halloysite nano-tubes with double-bond-modified surfaces; after polymerizing the magnetic halloysite nano-tubes with double-bond-modified surfaces, the polymerized monomers and a crosslinker by taking the 2,4-dichlorophenoxyacetic acid as a template, then removing the 2,4-dichlorophenoxyacetic acid to obtain the magnetic halloysite molecularly imprinted polymer with specific adsorption to the 2,4-dichlorophenoxyacetic acid. The raw materials used in the preparation method are low in cost; the preparation method is easy to operate and easy to implement; the prepared magnetic halloysite molecularly imprinted polymer is stable in structure, has specific adsorption to the 2,4-dichlorophenoxyacetic acid, and can effectively separate and remove the 2,4-dichlorophenoxyacetic acid from a complex system.

Description

technical field [0001] The invention relates to a method for preparing a magnetic halloysite molecularly imprinted polymer with specific adsorption for 2,4-dichlorophenoxyacetic acid, which belongs to the technical field of functional material preparation. Background technique [0002] Halloysite, an aluminum-silicon compound, has a chemical structure similar to kaolin, that is, Al 2 Si 2 o 5 (OH) 4 ·nH 2 O, but slightly different in morphology, halloysite has a hollow tubular structure, and its structural units are separated by a monolayer of water. Water in the inner layer can lead to physicochemical properties including organic interlayer and ion exchange capacity. In addition, halloysite has two sizes, 10A and 7A, of which 10A contains water, and the water is easily lost and then transformed into 7A. Because of its special tubular structure, excellent performance, abundant resources and extremely low cost, halloysite has great potential in many fields and has also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/06C08F226/06C08F212/36C08J9/26B01J20/26B01J20/30
Inventor 钟世安周成赟张小娜孔艳月周玲
Owner CENT SOUTH UNIV
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