Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method of enhancing ultraviolet photolysis of perfluoroalkyl compounds in water

A technology of perfluoroalkyl compounds, applied in the field of enhancing ultraviolet photolysis of perfluoroalkyl compounds in water bodies, can solve the problems of poor effect of perfluoroalkyl compounds, unstable hydrated electrons, etc. Implement and improve the effect of degradation efficiency

Active Publication Date: 2022-06-21
NANJING UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of instability of hydrated electrons and poor degradation effect of perfluoroalkyl compounds in the existing technology for degrading perfluoroalkyl compounds, the present invention provides a method for enhancing ultraviolet photolysis of perfluoroalkyl compounds in water

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method of enhancing ultraviolet photolysis of perfluoroalkyl compounds in water
  • A method of enhancing ultraviolet photolysis of perfluoroalkyl compounds in water
  • A method of enhancing ultraviolet photolysis of perfluoroalkyl compounds in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present embodiment mainly investigates the degradation and defluorination effects of different quenchers on PFOA, and the specific steps are:

[0044] (1) Transfer 300 mL of a mixture containing 65.0 mM methanol, ethanol, isopropanol, tert-butanol, hydrogen peroxide solution and 0.0242 mM PFOA solution into a cylindrical quartz photoreaction tube (usually, d=41 mm, h=400 mm) , and set 300 mL of PFOA solution containing only 0.0242 mM as a blank control, and transfer it to the same photoreaction tube for the same experiment, and adjust the pH of the above-mentioned different mixed solutions and control solutions to 10;

[0045] (2) Using a 36W low-pressure mercury lamp as a light source to irradiate the different mixed solutions and control solutions obtained in step S10, a photoreaction experiment was performed, the reaction temperature was controlled at 25±1°C, and the reaction time was 15 hours.

[0046] The sampling time was set to 0h, 0.5h, 1.5h, 2.5h, 3.5h, 4.5...

Embodiment 2

[0049] The present embodiment mainly investigates the types of free radicals in different quencher systems, and its specific steps are:

[0050] (1) Prepare 20 mL of 65.0 mM methanol, ethanol, isopropanol and tert-butanol solutions respectively, and set up a solution containing only 20 mL of ultrapure water as a blank control, and adjust the pH of the above different solutions to 10, followed by nitrogen aeration Deoxygenation for half an hour;

[0051] (2) The above solutions were respectively transferred to five 20 mL glass tubes, and the radical scavenger lutidine N-oxide (DMPO) was added, wherein the concentration of DMPO was 20 mM. Use a 180W mercury lamp as a light source to irradiate the above solution, after 1min of irradiation, sample 20 μL into the capillary, and then detect the free radical signal by an electron paramagnetic resonance spectrometer. The signal intensities of different free radicals are as follows: Figure 4 a and Figure 4 b shown.

[0052] Depend...

Embodiment 3

[0054] The present embodiment mainly investigates the degradation and defluorination effects of alcohol radicals on PFOA, and the specific steps are:

[0055] (1) Prepare 50 mL of 400.0 mM methanol, ethanol, isopropanol and tert-butanol solutions respectively, 100 mg L -1 10mL of PFOA solution, 10mL of 100.0mM persulfate solution, add ultrapure water to mix the above alcohol solution, PFOA solution and persulfate solution to 100mL, so that alcohols, PFOA and persulfate in the mixed solution The concentrations of PFOA were 200mM, 0.0242mM and 10.0mM respectively; at the same time, 100mL of PFOA solution containing only 0.0242mM was set as a blank control, and the pH value of the above mixed solution was adjusted to 10;

[0056] (2) Utilize a constant temperature water bath as a heating device to carry out a heating reaction to the above mixed solution, the reaction time is 25 hours, and the reaction temperature is controlled at 50±1°C.

[0057] The sampling time is set to 0h, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for enhancing ultraviolet photolysis of perfluoroalkyl compounds in water, belonging to the field of persistent pollutant degradation. The present invention uses a hydroxyl radical quencher to inhibit the quenching effect of hydroxyl radicals generated in the ultraviolet photolysis water system on hydration electrons, thereby prolonging the life of hydration electrons, enhancing the reaction efficiency of hydration electrons and perfluoroalkyl compounds, and further Promotes the degradation and defluorination of perfluoroalkyl compounds. The method of the present invention can not only solve the problems of harsh reaction conditions, secondary treatment of reaction waste and complicated operation in the existing technology of degrading perfluoroalkyl compounds, but also because alcohols are a kind of green chemicals, they are often used as extraction agent, which can be applied to the further harmless treatment of perfluoroalkyl compound adsorption and desorption liquid.

Description

technical field [0001] The invention belongs to the field of persistent pollutant degradation, and more particularly, relates to a method for enhancing ultraviolet photolysis of perfluoroalkyl compounds in water bodies. Background technique [0002] Perfluoroalkyl compounds (PFASs) are a new class of persistent organic pollutants, which have been widely used in various industries due to their good hydrophobic and oleophobic properties, high temperature resistance and strong oxidation resistance. Extensive use and their strong stability make perfluoroalkyl compounds (PFASs) ubiquitous in the global environment, with concentrations up to 1 mg L in surface water and groundwater -1 (Julian Campo; Francisca Pérez; Ana Masiá; Yolanda Picó; Marinel. Farré; Damià Barceló, Perfluoroalkyl substance contamination of the Llobregat Riverecosystem (Mediterranean area, NE Spain). Science of the Total Environment. 2015, 503-504:48-57 .Sharon K; Sagiv Sheryl L; Rifas-Shiman; Thomas F; Webst...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/32C02F101/36
CPCC02F1/32C02F2101/36
Inventor 谷成滕影陈张浩黄柳青
Owner NANJING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com