Magnetic molecular imprinting polymer for separating and enriching perfluorooctane sulfonate and preparation method thereof

A perfluorooctane sulfonic acid, magnetic molecular imprinting technology, applied in the directions of alkali metal compounds, chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult separation, low binding energy, low selectivity, etc., to improve separation The effect of enrichment efficiency, increasing adsorption capacity, and large specific surface area

Active Publication Date: 2017-08-22
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, PFOS has been widely used in industrial and consumer fields, but further studies have shown that PFOS has systemic toxicity to animals and humans, such as neurotoxicity, embryonic development and reproductive toxicity, and carcinogenicity.
In 2009, PFOS was officially included in Annex B of the Stockholm Convention, which restricts the global production and use of PFOS
At present, the main methods for treating PFOS include zero-valent iron reduction, ultrasonic degradation, photocatalysis, and membrane separation, etc., but they require high consumption and energy consumption.
However, although physical adsorbents including activated carbon, organic bentonite, and titanate nanotubes can effectively remove PFOS to a certain extent, they have disadvantages such as low selectivity, low reuse rate, expensive water treatment equipment, and time-consuming.
[0003] Molecular imprinting technique (MIP) is a process in which a specific target molecule is used as a template to prepare a polymer with specific selectivity for the molecule. It can be well matched in structure, and is usually described as an artificial "lock" technology of "molecular keys", but it is difficult to be practically applied due to its shortcomings such as low mass transfer, low binding energy, slow binding kinetics, and difficult separation, such as literature WaterRes.2008,42:3089~3097, the molecular imprint of PFOS synthesized with chitosan is not only difficult to separate, but the adsorption kinetic time is as long as 32h

Method used

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  • Magnetic molecular imprinting polymer for separating and enriching perfluorooctane sulfonate and preparation method thereof
  • Magnetic molecular imprinting polymer for separating and enriching perfluorooctane sulfonate and preparation method thereof
  • Magnetic molecular imprinting polymer for separating and enriching perfluorooctane sulfonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1Fe 3 o 4 @SiO 2 @CH=CH 2 preparation of

[0049] Step a weighs 2.000g FeCl 3 ·6H 2 O was completely dissolved in 60.0mL of ethylene glycol to form a yellow transparent solution. Add 4.000g of anhydrous sodium acetate and 15.2mL of 1,6-hexamethylenediamine in sequence, stir mechanically at 50°C for 30min, transfer to a high-temperature reaction kettle React at 198°C for 6 hours, magnetically separate, wash with ultrapure water and ethanol, and dry in vacuum to obtain Fe 3 o 4 .

[0050] Step b Weigh 450.0 mg of the product from step a and disperse it in 240 mL of ethanol and 60 mL of water, sonicate for 15 min, add 7.5 mL of NH 3 ·H 2 O and 1.05 mL TEOS, mechanically stirred at 40 °C for 12 h, magnetically separated, washed with ultrapure water and ethanol, and vacuum dried to obtain Fe 3 o 4 @SiO 2 .

[0051] Step c Weigh 1.000g of the resultant of step b and disperse it in 160mL of 10% acetic acid solution, add 0.6mL of 3-(methacryloyloxy)propyltr...

Embodiment 2

[0052] Example 2 Preparation of Magnetic Molecularly Imprinted Polymer

[0053] Take 100.0 mg of perfluorooctane sulfonic acid and 1.422 g of acrylamide into 300 mL of acetonitrile, and mechanically stir for 12 h at room temperature to form a pre-assembly solution. Add 7.930g ethylene glycol dimethacrylate, 0.450g azobisisobutyronitrile, 1.000g Fe 3 o 4 @SiO 2 @CH=CH 2 , blow nitrogen for 30min, and mechanically stir at 60°C for 24h. The synthesized magnetic molecularly imprinted polymer was magnetically separated, washed with acetonitrile until the supernatant was clear, and then methanol / acetic acid (v:v=9:1) was used to remove the template until no PFOS could be detected in the supernatant Existence, wash with methanol until the solution is neutral, magnetic separation, vacuum drying.

Embodiment 3

[0054] Example 3 Preparation of Magnetic Molecularly Imprinted Polymer

[0055] Take 100.0 mg of perfluorooctane sulfonic acid and 0.710 g of acrylamide into 300 mL of acetonitrile, and mechanically stir for 12 h at room temperature to form a pre-assembly solution. Add 7.930g ethylene glycol dimethacrylate, 0.450g azobisisobutyronitrile, 1.000g Fe 3 o 4 @SiO 2 @CH=CH 2 , blow nitrogen for 30min, and mechanically stir at 60°C for 24h. The synthesized magnetic molecularly imprinted polymer was magnetically separated, washed with acetonitrile until the supernatant was clear, and then methanol / acetic acid (v:v=9:1) was used to remove the template until no PFOS could be detected in the supernatant Existence, wash with methanol until the solution is neutral, magnetic separation, vacuum drying.

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Abstract

The invention belongs to the technical field of a magnetic molecular imprinting polymer, and particularly relates to a magnetic molecular imprinting polymer for separating and enriching perfluorooctane sulfonate and a preparation method thereof. The magnetic molecular imprinting polymer has an ultrathin molecular imprinting film, and achieves fast adsorption dynamics, high adsorption selectivity and repeated use performance; the perfluorooctane sulfonate in water can be effectively and fast removed.

Description

technical field [0001] The invention belongs to the technical field of magnetic molecularly imprinted polymers, in particular to a magnetic molecularly imprinted polymer for separating and enriching perfluorooctane sulfonate (PFOS) and a preparation method thereof. Background technique [0002] In recent years, PFOS has been widely used in industrial and consumer fields, but further studies have shown that PFOS has systemic toxicity to animals and humans, such as neurotoxicity, embryonic development and reproductive toxicity, and carcinogenicity. In 2009, PFOS was officially included in Annex B of the Stockholm Convention, which restricts the production and use of PFOS worldwide. At present, the main methods for treating PFOS include zero-valent iron reduction, ultrasonic degradation, photocatalysis, and membrane separation, etc., but they require high consumption and energy consumption. However, although physical adsorbents including activated carbon, organic bentonite, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F222/14C08J9/26B01J20/26B01J20/28
Inventor 谭克俊杜玲玲吴永琼张晓丽
Owner SOUTHWEST UNIV
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