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Preparation method for perfluorocaprylic acid molecular imprinting polymer on surfaces of multi-walled carbon nanotubes

A technology of multi-walled carbon nanotubes and perfluorooctanoic acid, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems that the adsorbent does not have selective adsorption performance and cannot efficiently remove PFOA

Active Publication Date: 2016-10-26
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual water environment contains a variety of coexisting anionic organic pollutants, and the concentration is usually much higher than that of PFOA in the water environment. Traditional adsorbents (such as activated carbon, zeolite, adsorption resin, silica gel, etc.) do not have selective adsorption properties and cannot Efficient removal of PFOA in water environment

Method used

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  • Preparation method for perfluorocaprylic acid molecular imprinting polymer on surfaces of multi-walled carbon nanotubes
  • Preparation method for perfluorocaprylic acid molecular imprinting polymer on surfaces of multi-walled carbon nanotubes
  • Preparation method for perfluorocaprylic acid molecular imprinting polymer on surfaces of multi-walled carbon nanotubes

Examples

Experimental program
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Embodiment 1

[0029] Example 1: Accurately weigh 10 mg of the adsorbent MWCNTs@MIP, and add them to polypropylene centrifuge tubes containing 50 mL of PFCs mixed solution. The PFCs in the solution include perfluorovaleric acid (PFPeA), perfluorohexanoic acid (PFHxA), Perfluoroheptanoic acid (PFHpA), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnA) and perfluorododecanoic acid (PFDoA) Fluorocarboxylic acid, perfluorobutanesulfonic acid (PFBS), perfluorohexanesulfonic acid (PFHxS) and perfluorooctanesulfonic acid (PFOS) and other three kinds of perfluorosulfonic acid, the concentration is 100μg / L, adjust the solution The pH value is 5.0. Under the conditions of 20±0.5°C and 180rpm, place the centrifuge tube in a constant temperature shaker and shake for 120min. The results of single-type and binary mixed competitive adsorption are as follows: Figure 4 and Figure 5 shown. For the single solute solution of PFOA and...

Embodiment 2

[0031] Example 2: In 15 mL of PFOA aqueous solution containing 500 μg / L, put 10 mg of MWCNTs@MIP respectively, and place the centrifuge tube in a constant temperature shaker for shaking, and the shaking conditions are the 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 the acetic acid / methanol solution with a volume ratio of 1:6 as the desorption solution to desorb and regenerate the material adsorbed with the target substance. Desorption conditions: Put the MWCNTs@MIP that adsorbed PFOA into 50mL desorption solution, and shake continuously at room temperature for 12h. Image 6 shown. After 5 regenerations, the adsorption and removal rate of MWCNTs@MIP to PFOA in the mixture of PFOA and other PFCs can still maintain almost the same removal rate as the first time, only reduced by 4.08%, indicating that the MWCNTs@MIP prepared by this method has Good renewable...

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Abstract

The invention discloses a molecular imprinting polymer on surfaces of multi-walled carbon nanotubes (MWCNTs@MIP) which is obtained by modifying the surfaces of the multi-walled carbon nanotubes (MWCNTs) by utilizing a molecular imprinting technology and is used for selective adsorption of perfluorocaprylic acid (PFOA) in a water environment. Results show that an equilibrium state of adsorption of the MWCNTs@MIP to the PFOA with a concentration of 1 mg / L can be reached in 80 min; the adsorption amount of the MWCNTs@MIP to the PFOA reaches 12.3 mg / g when the concentration of the PFOA is 17.5 mg / L; after the MWCNTs@MIP is repeatedly used for five times, the removal rate of PFOA still can be maintained almost as the same as the removal rate at the first time, and is only decreased by 4.08%; thus, the MWCNTs@MIP has adsorption selectivity, reusable performance and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of removing new pollutants in water by adsorption method, and specifically relates to modifying the surface of multi-walled carbon nanotubes (MWCNTs) by using molecular imprinting technology to obtain molecularly imprinted polymer (MIP), which is used for selective adsorption of water environment perfluorooctanoic acid (PFOA). Firstly, the MWCNTs were modified by silanization and vinylation to obtain the modified material MWCNTs@SiO 2 -HC=CH 2 , and then use surface molecular imprinting technology to load MIP on the surface of the modified MWCNTs, and finally use the synthesized MWCNTs@MIP as an adsorbent to selectively adsorb PFOA 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, inhibitors, surfactants, etc., and are widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F222/14C08K9/04C08K7/24C08J9/26B01J20/26B01J20/30C02F1/28
CPCB01J20/268C02F1/285C02F2101/14C08F292/00C08J9/26C08J2351/10C08K7/24C08K9/04C08F222/102
Inventor 曹凤梅卢少勇吴丰昌
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI