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A kind of method that utilizes molecular imprinting technology to prepare pfoa adsorption material

A molecular imprinting technology and adsorption material technology, which is applied in the field of new adsorption materials, can solve the problems of inability to remove PFOA efficiently

Active Publication Date: 2017-03-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the actual water environment contains a variety of coexisting anionic organic pollutants, and the concentration is usually much higher than that of PFOA, traditional adsorbents cannot efficiently remove PFOA in the water environment due to their lack of selective adsorption properties.

Method used

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  • A kind of method that utilizes molecular imprinting technology to prepare pfoa adsorption material
  • A kind of method that utilizes molecular imprinting technology to prepare pfoa adsorption material
  • A kind of method that utilizes molecular imprinting technology to prepare pfoa adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Accurately weigh 10 mg of PFOA-MIPs and NIPs and add them to a polypropylene centrifuge tube containing 50 mL of PFCs mixed solution. The PFCs in the solution include perfluorovaleric acid (PFPeA), perfluorohexanoic acid (PFHxA), and 8 types of perfluoroheptanoic acid (PFHpA), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnA) and perfluorododecanoic acid (PFDoA) Carboxylic acid and 3 kinds of perfluorosulfonic acid (PFBS), perfluorohexane sulfonic acid (PFHxS) and perfluorooctane sulfonic acid (PFOS), the concentration is 20 μg / L, adjust the pH of the solution Is 5.0. Place the centrifuge tube in a constant temperature shaker and shake for 12h (20±0.5℃, 150rpm), the result is as follows Figure 5 Shown. The adsorption rates of MIPs and NIPs to PFOA are 90% and 25%, respectively. The adsorption rates of MIPs to other PFCAs are 4.85-29.85%, and the adsorption rates of PFBS, PFHxS and PF...

Embodiment 2

[0023] Example 2: Put 10 mg PFOA-MIPs into 50 mL of PFOA aqueous solution containing 20 μg / L and 100 μg / L respectively, and place the centrifuge tube in a constant temperature shaker for shaking. The shaking conditions are the same as in Example 1. After the adsorption equilibrium is reached, the material's removal efficiency of PFOA at this time is analyzed, and then the desorption is carried out. The 0.5% KOH / methanol solution is used as the desorption solution to desorb and regenerate the material that has adsorbed PFOA. Desorption conditions: Put the PFOA-MIPs that adsorb PFOA into 50mL desorption solution, and shake continuously for 12h at room temperature. The result is as follows Image 6 Shown. After 5 cycles of adsorption and desorption regeneration, the removal rate of PFOA by the material can still reach 74.9-93.5 percent, indicating that the PFOA-MIPs prepared by this method have strong regeneration performance.

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Abstract

The present invention discloses a method for synthesizing a novel adsorption material having selectivity on pentadecafluorooctanoic acid in an aquatic environment by using a molecular imprinting technique (MIT). According to the method, acrylamide (AAM) is adopted as a functional monomer, ethylene glycol dimethacrylate (EDMA) is adopted as a cross-linking agent, an optimal reaction ratio of the template to the monomer to the cross-linking agent is 1:6:25, and a precipitation polymerization method is used to synthesize the novel adsorption agent having high adsorption selectivity on PFOA, wherein PFOA in the aqueous solution can be effectively removed, the removal rate can achieve 90%, the good selectivity on PFOA removal is provided, and the adsorption efficiency can achieve 74.9-93.5% after reusing five times. The synthesized PFOA-MIPs of the present invention have good selective adsorption property and renewable property, and can be used for absorption removal of PFOA in various aquatic environments.

Description

Technical field [0001] The present invention belongs to the technical field of removing new pollutants in water by adsorption method, and specifically relates to the use of molecular imprinting technique (MIT), perfluorooctanoic acid (PFOA) as template, and acrylamide (Acrylamide, AAM) as functional monomer , Ethyleneglycol dimethacrylate (EDMA) is a cross-linking agent, which is polymerized by thermally initiated polymerization in acetonitrile solution to form a new type of adsorption material with selective adsorption capacity for PFOA in an aqueous environment. Background technique [0002] Perfluorinated compounds (PFCs) have excellent properties such as chemical inertness and heat resistance, and can be used as plastic additives, lubricants, flame retardants, inhibitors, surfactants, etc., and have been in industrial production since the 1950s And life are widely used, with its production and use, a large number of PFCs are released into the environment. Therefore, it has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F222/14C08J9/26B01J20/26B01J20/30C02F1/28
Inventor 孙红文曹凤梅汪磊
Owner NANKAI UNIV