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Surface molecularly imprinted composite material and its preparation method and application

A technology of surface molecular imprinting and composite materials, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of small adsorption capacity, low removal efficiency, adsorption performance and selectivity of target pollutants impact and other issues, to achieve the effect of reducing interference

Active Publication Date: 2019-02-26
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional molecularly imprinted materials have problems such as small adsorption capacity, slow mass transfer rate, incomplete elution of template molecules, and low removal efficiency.
[0006] At present, the selective adsorption mechanism of molecularly imprinted materials for target molecules is mainly through hydrogen bonding. Most of these molecularly imprinted materials are prepared by surface imprinting polymerization in organic solvents (acetonitrile, toluene, dimethyl sulfoxide, etc.), while This kind of imprinting material through hydrogen bonding has the disadvantage that the specific imprinting site in the water body is susceptible to water molecules competing with the target molecule for the functional group of the imprinting site, which leads to the adsorption performance and selectivity of the imprinting material on the target pollutants. Therefore, on the basis of the existing molecular imprinting technology, it is of great practical significance to study a kind of imprinting material with better anti-environmental interference and high efficiency and selectivity to remove endocrine disruptors in the environment.

Method used

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  • Surface molecularly imprinted composite material and its preparation method and application
  • Surface molecularly imprinted composite material and its preparation method and application
  • Surface molecularly imprinted composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing the surface molecularly imprinted composite material of the present invention, the preparation process is as follows figure 1 shown, including the following steps:

[0053] (1) Preparation of magnetic nano-ferric oxide: take 1.72g FeCl 2 4H 2 O and 4.72 g FeCl 3 ·6H 2 O was dissolved in 80 mL of degassed ultrapure water under N 2 Stir vigorously at a speed of 800 rpm under protection, raise the temperature to 80°C, add 10 mL of ammonia water dropwise, and reflux the reaction for 30 min. Separate the black product with a Nd–Fe–B permanent magnet, and pour out the supernatant at the same time. The precipitate (black product) was washed with ultrapure water to remove unreacted reagents, and dried in vacuum to obtain magnetic nano-ferric oxide.

[0054] (2) Preparation of maleamide-based β-CD: Take 6g β-cyclodextrin (β-CD) and 13.0g maleic anhydride in 100mL dimethylformamide (DMF), in N 2 Stir fully under protection until it is completely disso...

Embodiment 2

[0067] An application of the surface molecularly imprinted composite material of the present invention in removing bisphenol A in water comprises the following steps:

[0068] Experimental group (MMIPs): 0.02 g of MMIPs in Example 1 was placed in 50 mL of bisphenol A solution with an initial concentration of 200 mg / L, wherein the ionic strength of the bisphenol A solution was 15 mM in terms of NaCl concentration. The pH value of the solution was adjusted to 3, 4, 5, 6, 7, 8, 9, 10, 11 with a concentration of 1M HCl solution or a concentration of 1M NaOH solution. At 25°C and 180rpm, shake at constant temperature for 24h. The treated solution is separated from solid and liquid under the action of an external magnetic field, and the supernatant is filtered through a filter with a pore size of 0.22 μm to obtain a filtrate. The residual concentration of bisphenol A in the filtrate was measured with an ultraviolet-visible spectrophotometer at a wavelength of 278 nm, and the adsorp...

Embodiment 3

[0075] An application of the surface molecularly imprinted composite material of the present invention in removing bisphenol A in water comprises the following steps:

[0076] Experimental group (MMIPs): take 0.02g of MMIPs in Example 1 and put them in 50mL of bisphenol A solutions with ionic strength (NaCl) of 0, 5mM, 15mM, 25mM, and 50mM respectively, wherein the initial concentration of bisphenol A solution is 200mg / L. The pH of the solution was adjusted to 6 with a 1M HCl solution or a 1M NaOH solution. Shake at 25°C and 180rpm for 40min at constant temperature. The treated solution is separated from solid and liquid under the action of an external magnetic field, and the supernatant is filtered through a filter with a pore size of 0.22 μm to obtain a filtrate, thereby completing the treatment of bisphenol A.

[0077] Control group (MNIPs): take 0.02g of MNIPs in the comparative example and put them in 50mL of bisphenol A solution with ionic strength (NaCl) of 0, 5mM, 1...

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Abstract

The invention discloses a surface molecularly imprinted composite material as well as a preparation method and application thereof. The surface molecularly imprinted composite material is prepared by using bisphenol A as a template molecule, beta-cyclodextrin-modified magnetic chitosan as an imprinting vector and methacrylic acid as a functional monomer, forming a polymer through a polymerization reaction and then eluting the template molecule in the polymer. The surface molecularly imprinted composite material provided by the invention has the advantages of good adsorption effect, good stability, high capability of resisting water-molecule interference and a severe environment, high selectivity on the target pollutant bisphenol A, and the like, can be used for removing the bisphenol A in a water body, has the advantages of short treatment period, high selectivity, good stability, high capability of resisting the severe environment, capability of being quickly recycled, no harm to an environment, and the like, and has wide application prospects in the fields of environmental pollution treatment and environmental restoration.

Description

technical field [0001] The invention belongs to the field of physical and chemical treatment of environmental endocrine disruptors in polluted environments and environmental functional materials, and specifically relates to a surface molecular imprinted composite material and its preparation and application of the material to selectively remove bisphenol A in water. Background technique [0002] Environmental endocrine disrupting chemicals (environmental endocrine disrupting chemicals, EDCs) refer to the synthesis, secretion, transportation, binding, reaction and metabolism of natural hormones that can interfere with the biological or human body to maintain its own balance and regulate the development process. Exogenous chemical substances that affect the functions of the reproductive, nervous and immune systems, etc. In recent years, it has been listed as another major global environmental problem after the destruction of the ozone layer and the greenhouse effect. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F292/00C08F222/14C08F220/06C08J9/26B01J20/26B01J20/30C02F1/28C02F101/34C02F101/30
CPCB01J20/268C02F1/285C02F2101/305C02F2101/345C08F251/00C08F292/00C08J9/26C08J2201/0422C08J2351/02C08J2351/10C08F222/102
Inventor 黄丹莲唐泽恒曾光明赖萃王荣忠王漫漫柳林杉覃杏梦
Owner HUNAN UNIV
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