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Method for rapidly removing perfluoro/polyfluoro compounds in environmental water

A perfluorinated compound, environmental water technology, applied in the field of chemical analysis technology and environmental protection, can solve the problems of loss of removal of PFASs, high cost, interference, etc., and achieve the effects of shortening adsorption time, good treatment effect and easy operation.

Active Publication Date: 2020-06-09
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical methods to remove perfluorinated compounds are low in cost, easy to operate and highly applicable, but it is difficult to remove them fundamentally; chemical methods may generate short-chain perfluorocarboxylic acids, and there are limitations in the actual operation such as high cost
At present, the commonly used adsorption removal technology uses activated carbon as an adsorbent to remove PFASs in environmental water samples, but the adsorption of activated carbon on PFASs is largely affected by organic matter in water, and the activated carbon bed is lost in a short time due to the competition of coexisting organic matter. Ability to remove PFASs
In addition, the ion exchange resin adsorption method is also relatively common, but it is easily interfered by common anions and cations in the environmental water.

Method used

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  • Method for rapidly removing perfluoro/polyfluoro compounds in environmental water
  • Method for rapidly removing perfluoro/polyfluoro compounds in environmental water
  • Method for rapidly removing perfluoro/polyfluoro compounds in environmental water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The mixed solution of perfluorooctanoic acid and perfluorooctane sulfonic acid with different salinity was treated by PVDF membrane adsorption removal method.

[0063] Measure six 200mL deionized water samples without PFASs and place them in 200mL polyethylene terephthalate (PET) bottles, add a mixed solution of 1ng PFOA, PFOS and 1ng mixed internal standard to the deionized water, and ultrasonically mix For standby, the salinity was adjusted to 0, 1, 2, 3, 4 and 5% w / v with sodium chloride, without adding hydrochloric acid, protein and humic acid. Use a piece of PVDF filter membrane to remove PFOA and PFOS in the sample solution, by figure 1 It can be seen that when the salinity is 0% w / v, the PVDF filter membrane has the highest removal efficiency of PFOA and PFOS, which are 85.7% and 84.6%, respectively.

Embodiment 2

[0065] The mixed solution of perfluorooctanoic acid and perfluorooctane sulfonic acid under different pH conditions was treated by PVDF membrane adsorption removal method.

[0066] Measure six 200mL deionized water samples without PFASs and place them in 200mL polyethylene terephthalate (PET) bottles, add a mixed solution of 1ng PFOA, PFOS and 1ng mixed internal standard to the deionized water, and ultrasonically mix For standby, use dilute hydrochloric acid and sodium hydroxide to adjust the salinity to 3, 4, 5, 6, 7 and 9 respectively, without adding sodium chloride, protein and humic acid. Use a piece of PVDF filter membrane to remove PFOA and PFOS in the sample solution, by figure 2 It can be seen that when the pH is 7-9, the removal efficiency of PVDF membrane to PFOA and PFOS is higher, which can reach more than 84%.

Embodiment 3

[0068] The mixed solution of perfluorooctanoic acid and perfluorooctane sulfonic acid containing different concentrations of protein was treated by PVDF membrane adsorption removal method.

[0069] Measure six 200mL deionized water samples without PFASs and place them in 200mL polyethylene terephthalate (PET) bottles, add a mixed solution of 1ng PFOA, PFOS and 1ng mixed internal standard to the deionized water, and ultrasonically mix spare. Add different concentrations of BSA solutions to the sample solution to make the concentrations 0, 0.05, 0.1, 0.2, 0.5 and 1 g / L, respectively, without adding sodium chloride, hydrochloric acid and humic acid. Use a piece of PVDF filter membrane to remove PFOA and PFOS in the sample solution, by image 3 It can be seen that when the concentration of BSA is within 0-0.1g / L, the removal efficiency of PFOA and PFOS is above 80%. Therefore, the PVDF filter membrane of the invention has a better removal effect on PFASs in environmental water s...

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Abstract

The invention belongs to the field of chemical analysis technology and environmental protection, and provides a polyvinylidene fluoride filter membrane adsorption removal method for removing perfluorinated compounds in environmental water. An adsorption medium provided by the invention is a highly fluorinated polyvinylidene fluoride filter membrane, a sample solution can quickly flow through the adsorption medium due to the large diameter of the adsorption medium, and the adsorption medium has high adsorption capacity and good selectivity on perfluorinated compounds based on the fluorine-fluorine affinity effect, and is especially suitable for enrichment and / or purification of long-chain perfluorinated compounds in environmental water samples. The adsorption medium used in the method doesnot need to be synthesized and is low in price and convenient to operate.

Description

technical field [0001] The invention belongs to the field of chemical analysis technology and environmental protection, and relates to a rapid removal method of perfluorinated / polyfluorinated compounds, based on the fluorine-fluorine affinity between highly fluorinated polyvinylidene fluoride filter membranes and perfluorinated compounds in environmental water, To achieve highly selective removal of perfluorinated compounds. Background technique [0002] Perfluorinated / polyfluorinated compounds (PFASs) are a class of aliphatic compounds characterized by partially or fully fluorinated alkyl chains and terminal functional groups such as carboxylates, sulfonates, sulfonamides, phosphonates, and alcohols . Among them, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) are the two most typical PFASs existing in the environment, and they are also the final products of the transformation of various PFASs. Based on their hydrophobic and oleophobic properties, PF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/28C02F101/36
CPCC02F1/285C02F1/44C02F2101/36
Inventor 蔡亚岐王娟史亚利
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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