Method for efficiently treating perfluorinated compound polluted water body

A technology for perfluorinated compounds and water bodies, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc. Effect

Active Publication Date: 2021-03-26
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the low efficiency of hydrated electrons in the treatment of perfluorinated compounds in the prior art, the present invention provides a method for efficiently treating perfluorinated compound-contaminated water bodies, using indole derivatives that are positive or neutral in water to enhance the The binding effect between the PFCs of the anion, thereby improving the reaction efficiency of the hydrated electrons generated by it and the PFCs, and promoting the degradation and defluorination of the PFCs

Method used

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  • Method for efficiently treating perfluorinated compound polluted water body
  • Method for efficiently treating perfluorinated compound polluted water body
  • Method for efficiently treating perfluorinated compound polluted water body

Examples

Experimental program
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Embodiment 1

[0040] This example mainly investigates the degradation and defluorination effects of indole derivatives with different electrical properties in water on PFOA, and the specific steps are:

[0041] S10. Prepare 300mL of 1mM 1-indole acetic acid, 3-indole acetic acid, 3-indole propionic acid, 3-indole carboxylic acid, indole, methyl indole, anophylline, tryptamine and The 0.024mM PFOA mixed solution is placed in the quartz light reaction tube (d=41mm; h=400mm), and the 300mL PFOA solution containing only 0.024mM is set as the control group at the same time. The above experiment is carried out in the same reactor, and different mixed solution and control solution to adjust the pH value to 6; wherein, 1-indole acetic acid, 3-indole acetic acid, 3-indole propionic acid, 3-indole carboxylic acid are negatively charged in water, and indole and methyl indole are in The water is electrically neutral, and anophylline and tryptamine are positively charged in water;

[0042] S20, using a...

Embodiment 2

[0045] This example mainly investigates the degradation and defluorination effects of indole derivatives with different electrical properties in water on PFOS, and the specific steps are as follows:

[0046] S10. Put the prepared 300mL mixed solution of 1mM 3-indoleacetic acid, indole, anophylline and 0.024mM PFOS into a quartz photoreaction tube (d=41mm; h=400mm), and set only containing The 300mL PFOS solution of 0.024mM was used as the control group to carry out the above experiment in the same reactor, and adjust the pH value of the different mixed solutions and the control solution to 6; among them, 3-indoleacetic acid is negatively charged in water, and indole in water It is electrically neutral, and agrophylline is positively charged in water;

[0047] S20, using a 36W low-pressure mercury lamp as a light source to perform light reaction on the different mixed solutions obtained in step S10 and the control solution, the reaction temperature is controlled at 25±2° C., an...

Embodiment 3

[0050] This embodiment mainly investigates the influence of pH on the indole system, and its specific steps are;

[0051] S10. Place the mixed solution of 300mL of 1mM indole and 0.024mM PFOA in the quartz photoreaction tube (d=41mm; h=400mm), and mix the mixed solution with different concentrations of NaOH (5mM~1M). The pH value was adjusted to 4, 6, 8, 10 respectively;

[0052] S20. Use a 36W low-pressure mercury lamp as a light source to perform light reaction, the reaction temperature is controlled at 25±2° C., and the reaction time is 8 hours. The sampling time is set to 0h, 0.5h, 1.5h, 2.5h, 3.5h, 4.5h, 6h, 8h respectively. The sample is divided into two parts, the remaining PFOA content is measured by LC-MS / MS, and the generated F ion content is measured by ion chromatography (IC), so as to calculate the degradation rate and defluorination rate of PFOA. The specific degradation curve and defluorination curve are respectively Such as Figure 5 (a) and Figure 5 (b) s...

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Abstract

The invention discloses a method for efficiently treating a perfluorinated compound polluted water body, and belongs to the field of degradation of persistent pollutants. An indole derivative which iselectropositive or electrically neutral in water is utilized to enhance the binding action with the PFCs of anions, thereby enhancing the reaction efficiency of the generated hydrated electrons and PFCs, promoting the degradation and defluorination of PFCs, the method solves the problems of low degradation efficiency, harsh reaction conditions, need of adding other exogenous substances and the like in the existing PFCs degradation method, does not cause secondary pollution to the environment, and has high application value.

Description

technical field [0001] The invention belongs to the field of persistent pollutant degradation, and more specifically relates to a method for efficiently treating water bodies polluted by perfluorinated compounds. Background technique [0002] Perfluorinated compounds (PFCs) are a class of synthetic organic compounds that have been used in all aspects of our lives due to their excellent chemical stability. A large amount of production and use has led to the current concentration of perfluorinated compounds in surface water and groundwater around the world reaching 1ng L -1 -1 mg L -1 .(Paul, A.G.; Jones, K.C.; Sweetman, A.J., A First Global Production, Emission, And Environmental Inventory For Perfluorooctane Sulfonate. Environmental Science & Technology 2009, 43, (2), 386-392. Houtz, E.F.; Sedlak, D.L., Oxidative con as a means of detecting precursors to perfluoroalkyl acids in urban runoff. Environmental Science&Technology 2012, 46, (17), 9342-9349. Liu, J.; Avendano, S.M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/36
CPCC02F1/32C02F1/00C02F2101/36C02F2101/40
Inventor 谷成陈张浩滕影李晨米娜
Owner NANJING UNIV
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