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Preparation method of adsorbent for removing typical perfluorinated compounds in water environments

A technology of perfluorinated compounds and adsorbents, which is applied in the field of preparation of typical perfluorinated compound adsorbents in the removal of water environment, can solve the problems that the adsorbent does not have selective adsorption performance and cannot be removed efficiently.

Active Publication Date: 2016-12-14
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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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 and PFOS, traditional adsorbents do not have selective adsorption performance and cannot efficiently remove PFOA and PFOS in the water environment.

Method used

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  • Preparation method of adsorbent for removing typical perfluorinated compounds in water environments
  • Preparation method of adsorbent for removing typical perfluorinated compounds in water environments
  • Preparation method of adsorbent for removing typical perfluorinated compounds in water environments

Examples

Experimental program
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Effect test

Embodiment 1

[0024]Embodiment 1: Accurately weigh 10mg TFMAA / 4-Vpy-MIP and TFMAA / 4-Vpy-NIP, respectively add to polypropylene centrifuge tube containing 50mL PFCs mixed solution, PFCs in the solution contains perfluorovaleric acid (PFPeA) , perfluorohexanoic acid (PFHxA), perfluoroheptanoic acid (PFHpA), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnA) and perfluorodecanoic acid 8 kinds of perfluorocarboxylic acids including diacid (PFDoA) and 3 kinds of perfluorosulfonic acids including perfluorobutanesulfonic acid (PFBS), perfluorohexanesulfonic acid (PFHxS) and perfluorooctanesulfonic acid (PFOS), The concentration was 20 μg / L, and the pH of the solution was adjusted to 5.0. Place the centrifuge tube in a constant temperature shaker and shake for 12h (20±0.5°C, 150rpm), the results are as follows: Figure 5 shown. The adsorption rates of TFMAA / 4-Vpy-MIP to PFOA and PFOS reached 78.8% and 76.7%, respectively, ...

Embodiment 2

[0025] Example 2: In 50mL of two aqueous solutions of PFOA and PFOS containing 20μg / L and 100μg / L, put 10mg TFMAA / 4-Vpy-MIP respectively, and place the centrifuge tube in a constant temperature shaker for shaking. Same as Example 1. After reaching the adsorption equilibrium, analyze the removal efficiency of the material to PFOA at this time, and then perform desorption, and use 0.5% KOH / methanol solution as the desorption solution to desorb and regenerate the material adsorbed with the target substance. Desorption conditions: Put the TFMAA / 4-Vpy-MIP that adsorbs PFOA into 50mL desorption solution, shake continuously at room temperature for 12h, the results are as follows Image 6 shown. After 5 regenerations, the adsorption and removal rates of TFMAA / 4-Vpy-MIP in the mixture of PFOA, PFOS and other PFCs did not decrease significantly, and the adsorption and removal rates of PFOA and PFOS decreased by 4.03% and 3.00%. It shows that the TFMAA / 4-Vpy-MIP prepared by this metho...

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Abstract

The invention discloses a method for synthesizing a novel adsorbing material capable of selectively absorbing perfluorooctanic acid (PFOA) and perfluorooctane sulfonate (PFOS) in water environments by means of a Molecular imprinting technique (MIT). The method comprises the steps that a bi-functional monomer molecular imprinted polymer (TMFAA / 4-Vpy-MIP) is synthesized by selecting 2-(Trifluoromethyl)acrylic acid (TFMAA) and 4-Vinylpyridine (4-Vpy) as bi-functional monomers, selecting PFOA as a template molecule and selecting EDMA as a cross-linking agent; the polymer can efficiently and selectively absorb and remove PFOA and PFOS in a water phase simultaneously, wherein the adsorption rate for PFOA reaches 78.8%, the adsorption rate for PFOS reaches 76.7%, the removal rate of adsorption for short chains PFCs (PFBA, PFPA, PFHpA and PFBS) is only 13.2% to 47.6%, the removal rates of adsorption for long chains PFCs (PFNA, PFDA, PFUnA and PFDoA) are 65.0%, 67.0%, 68.7% and 65.1% respectively, and the adsorption rate for PFHpA is only 12.8%. After the novel absorbing material is repeatedly used five times, the adsorption rate can still reach 74.9% to 93.5%. The synthesized TFMAA / 4-Vpy-MIP has good selective adsorptivity and renewability and can be used for adsorption removal of PFOA and PFOS in various water environments.

Description

technical field [0001] The invention belongs to the technical field of removing new pollutants in water by adsorption, and specifically relates to the use of molecular imprinting technology (Molecular imprinting technique, MIT), with perfluorooctanoic acid (Perfluorooctanoic acid, PFOA) as a template, 2-(trifluoromethyl)acrylic acid (2 -(Trifluoromethyl)acrylic acid, TFMAA) and 4-vinylpyridine (4-Vinylpyridine, 4-Vpy) are bifunctional monomers, and ethylene glycol dimethacrylate (Ethylene glycoldimethacrylate, EDMA) is a cross-linking agent. Polymers are formed by heat-initiated polymerization in acetonitrile solution, forming a new type of adsorption material with selective adsorption characteristics for PFOA and perfluorooctane sulfonic acid (PFOS) in the water 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/06C08F220/04C08F222/14C08J9/26
CPCC08F226/06C08J9/26C08J2339/08C08F220/04C08F222/102
Inventor 曹凤梅卢少勇吴丰昌
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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