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Method utilizing polylactic acid/carbon nanotube composite electro-spun fiber membrane to absorb and remove perfluorooctane sulfonate in water

A carbon nanotube composite and perfluorooctane sulfonic acid technology, which is applied in the direction of adsorption of water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of unsatisfactory adsorption efficiency of electrospun fiber membranes, and achieve Facilitate rapid placement, mild conditions and strong adsorption capacity

Inactive Publication Date: 2015-04-15
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hydrophobic and oleophobic properties of PFOS, the adsorption efficiency of electrospun fiber membranes is not ideal.

Method used

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  • Method utilizing polylactic acid/carbon nanotube composite electro-spun fiber membrane to absorb and remove perfluorooctane sulfonate in water
  • Method utilizing polylactic acid/carbon nanotube composite electro-spun fiber membrane to absorb and remove perfluorooctane sulfonate in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First, 3 g of polylactic acid with a molecular weight of 100,000 was added to a glass Erlenmeyer flask filled with 20 g of methylene chloride solution. After mixing, it was placed on a magnetic stirrer and stirred at room temperature for 3 hours to obtain a transparent gel solution. Weigh 50 mg of acidified multi-walled carbon nanotubes and add them into 5 mL of dichloromethane, and sonicate for 10 minutes under the condition of 20 kHz in a digitally controlled ultrasonic instrument, so that the multi-walled carbon nanotubes are evenly dispersed in dichloromethane, and carbon nanotubes- Dichloromethane dispersion. Then take a certain amount of dispersion liquid and add it to the polymer transparent gel solution, mix it on a vortex mixer for 5 minutes (1000 rpm), and then ultrasonicate it for 10 minutes to make a uniform carbon nanotube / polymer mixed gel. The mixed gel was introduced into the spinneret of the electrospinning device, the flow rate of the spinning solution...

Embodiment 2

[0045] The preparation steps of the polylactic acid / carbon nanotube composite electrospun fiber membrane are the same as in Example 1.

[0046] Cut the obtained polylactic acid / carbon nanotube composite electrospun fiber membrane into small squares of 1 cm×1 cm, and peel them off from the aluminum foil. Then weigh 50-55 mg (about 3 pieces) of polylactic acid / carbon nanotube composite electrospun fiber membrane and add it to 50 mL of PFOS aqueous solution with a concentration of 10 μg / L; and place the mixed system at 25 ° C and 150 rpm to vibrate and react. After 20 h of reaction, samples were taken and determined by high-performance liquid chromatography-mass spectrometry (HPLC-MS / MS, API3200, Applied Biosystems, USA). At the same time, a blank PLA electrospun fiber membrane was reacted under the same conditions as a control experiment. In this method, the adsorption and removal rate of PFOS by polylactic acid / carbon nanotube composite electrospun fiber membrane was 89.33%, w...

Embodiment 3

[0048] The preparation steps of the polylactic acid / carbon nanotube composite electrospun fiber membrane are the same as in Example 1.

[0049] Cut the obtained polylactic acid / carbon nanotube composite electrospun fiber membrane into small squares of 1 cm×1 cm, and peel them off from the aluminum foil. Then weigh 50-55 mg (about 3 pieces) of polylactic acid / carbon nanotube composite electrospun fiber membrane and add it to 50 mL of PFOS aqueous solution with a concentration of 100 μg / L; and place the mixed system at 25 ° C and 150 rpm to vibrate and react. After 20 h of reaction, samples were taken and determined by high-performance liquid chromatography-mass spectrometry (HPLC-MS / MS, API3200, Applied Biosystems, USA). At the same time, a blank PLA electrospun fiber membrane was reacted under the same conditions as a control experiment. In this method, the adsorption and removal rate of PFOS by PLA / carbon nanotube composite electrospun fiber membrane was 82.62%, while the ad...

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Abstract

The invention belongs to the field of sewage processing, and specifically relates to a method utilizing a polylactic acid / carbon nanotube composite electro-spun fiber membrane to absorb and remove perfluorooctane sulfonate in water. The method comprises two steps: preparation of a polylactic acid / carbon nanotube composite electro-spun fiber membrane and removal of perfluorooctane sulfonate in water through adsorption of the polylactic acid / carbon nanotube composite electro-spun fiber membrane. More specifically, the method comprise the following steps: taking polylactic acid and carbon nanotubes, which have been processed by acid, as the raw materials, then spinning the raw materials through an electrostatic spinning technology so as to obtain polylactic acid / carbon nanotube composite electro-spun fiber membrane, and then making the composite electro-spun fiber membrane carry out reactions with perfluorooctane sulfonate water solutions with different concentrations so as to remove perfluorooctane sulfonate in water through adsorption. The invention provides an efficient method for remove perfluorooctane sulfonate in water through adsorption, more than 70% of perfluorooctane sulfonate in water can be removed ( in a concentration range of 2-1000 microgram / liter), and the absorbent has the advantages of simple preparation, environment-friendliness, and easy recycling. The method is easy to operate, is economic and efficient, and will not generate secondary pollution to the environment.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to the field of treatment of perfluorooctane sulfonic acid polluted sewage, and specifically relates to a method for adsorbing and removing perfluorooctane sulfonic acid in water by using polylactic acid / carbon nanotube composite electrospun fiber membrane. Background technique [0002] Perfluorooctane sulfonic acid (PFOS) is a kind of artificially synthesized high-fluorine compound, which has the characteristics of hydrophobicity and oleophobicity at the same time, and is widely used in the production of surface antifouling treatment agents such as textiles, leather products, furniture and carpets; due to its The chemical properties are very stable, and it is also used as an intermediate in the production of many civil and industrial products such as coatings, foam fire extinguishing agents, floor polishes, pesticides, and imaging materials. Due to the special perfluorinated chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/26B01J20/30B01J20/28C02F101/36
CPCB01J20/26B01J20/28B01J20/28016B01J20/30B01J2220/42B01J2220/445B01J2220/4806B01J2220/4812C02F1/288C02F2101/14C02F2305/08
Inventor 代云容宋永会王思宇
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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