CN-122010275-A - Degradation method of fluorine-containing organic compound

Abstract

The application discloses a degradation method of a fluorine-containing organic compound, which comprises the steps of detecting a water body to be treated, in which the fluorine-containing organic compound is dissolved, so as to determine the content of the fluorine-containing organic compound with a target oxidizable group in the fluorine-containing organic compound of the water body to be treated, and mixing a strong oxidant with the water body to enable the strong oxidant to have an oxidation reaction with the fluorine-containing organic compound with the target oxidizable group if the content of the fluorine-containing organic compound with the target oxidizable group in the water body to be treated is greater than or equal to a threshold value. The degradation method of the fluorine-containing organic compound avoids invalid treatment of the fluorine-containing organic compound, improves degradation efficiency, can inhibit the generation of toxic intermediate products and fully mineralizes the fluorine-containing organic compound.

Inventors

• ZHANG YANYAN
• LIU LINHAO

Assignees

• 西湖大学

Dates

Publication Date

20260512

Application Date

20260311

Claims (10)

1. 1. A method for degrading a fluorine-containing organic compound, wherein the degradation method comprises: detecting a water body to be treated in which the fluorine-containing organic compound is dissolved, so as to determine the content of the fluorine-containing organic compound with the target oxidizable group in the fluorine-containing organic compound in the water body to be treated; And if the content of the fluorine-containing organic compound with the target oxidizable group in the water body to be treated is greater than or equal to a threshold value, mixing a strong oxidant with the water body to be treated so as to enable the strong oxidant to have an oxidation reaction with the fluorine-containing organic compound with the target oxidizable group.
2. 2. The method for degrading a fluorine-containing organic compound according to claim 1, wherein the detecting the water body to be treated in which the fluorine-containing organic compound is dissolved comprises: measuring the total fluorine content of the fluorine-containing organic compounds in the water body to be treated; determining a target total amount of fluorine of the fluorine-containing organic compound having the target oxidizable group; the content of the fluorine-containing organic compound with the target oxidizable group in the fluorine-containing organic compound of the water body to be treated is the ratio of the total amount of the target fluorine to the total amount of the fluorine.
3. 3. The method for degrading a fluorine-containing organic compound according to claim 2, wherein the ratio is a mass ratio, a concentration ratio, a molar amount ratio or a molar concentration ratio.
4. 4. The method of degrading a fluorine-containing organic compound according to claim 1, wherein the threshold is 50%, preferably 60%, more preferably 80%, more preferably 85%, more preferably 90%.
5. 5. The method for degrading a fluorine-containing organic compound according to claim 1, wherein the fluorine-containing organic compound is a perfluoro and a polyfluoroalkyl group-based compound, the target oxidizable group comprises at least one of a carboxylic acid group, a carbon-hydrogen bond, a carbon-carbon double bond, an amide bond and a sulfonamide group, the hydrocarbon bond comprises a methylene group and a methine group, and preferably the perfluoro and polyfluoroalkyl group-based compound comprises a perfluorocarboxylic acid, a polyfluorocarboxylic acid, a perfluoro/polyfluoropesulfonic acid and a precursor compound thereof, a hydrogen-containing or chlorine-containing substituted perfluoro and polyfluoroalkyl group-based compound, an ether-containing/branched/cyclic or end group-modified perfluoro and polyfluoroalkyl group-based compound.
6. 6. The method for degrading a fluorine-containing organic compound according to claim 1, wherein the strong oxidizing agent is persulfate, and the concentration of persulfate is 1mM to 200mM, preferably 20mM to 100mM, more preferably 100mM.
7. 7. The method for degrading a fluorine-containing organic compound according to claim 6, wherein the persulfate is one of a peroxymonosulfate and a peroxydisulfate, wherein the peroxymonosulfate comprises at least one of sodium peroxymonosulfate, potassium peroxymonosulfate, ammonium peroxymonosulfate, sodium monopersulfate, potassium monopersulfate, and at least one of sodium peroxydisulfate, potassium peroxydisulfate, ammonium peroxydisulfate, tetra-n-butylammonium persulfate, and choline peroxysulfate, preferably one of sodium peroxydisulfate and potassium peroxydisulfate, and preferably the peroxydisulfate is peroxydisulfate.
8. 8. The method for degrading a fluorine-containing organic compound according to claim 1, wherein the degradation method comprises an activation treatment, wherein the activation treatment is at least one of thermal activation, ultraviolet light activation, activated carbon activation, transition metal activation, ultrasonic activation, microwave activation, electrochemical activation, photo/thermal coupling activation, metal-organic framework activation or carbon/metal supported catalytic activation, preferably one of thermal activation and ultraviolet light activation, more preferably thermal activation.
9. 9. The method of degrading a fluorine-containing organic compound according to claim 8, wherein the heat-activated treatment temperature is 40-95 ℃, preferably 85 ℃; The ultraviolet light activation treatment wavelength is 200-300nm, preferably 254nm.
10. 10. The method for degrading a fluorine-containing organic compound according to claim 1, wherein after the fluorine-containing organic compound having a target oxidizable group undergoes an oxidation reaction, the organic fluorine conversion rate is not less than 85%, and the time of the oxidation reaction is 0.5 to 24 hours, preferably 4 to 12 hours.

Description

Degradation method of fluorine-containing organic compound Technical Field The application relates to the field of pollutant treatment, in particular to a degradation method of fluorine-containing organic compounds. Background Perfluoro and polyfluoroalkyl compounds (per-and polyfluoroalkyl substances, PFAS) are a structurally diverse class of organofluoro compounds, typically consisting of a highly stable perfluorinated carbon chain and one polar functional group (such as carboxylate-COO - or sulfonate-SO 3-). In recent years, some novel PFAS have introduced methylene (-CH 2 -), double bonds, ether linkages, chlorine, or hydrogen groups in the carbon chain. PFAS is extremely difficult to degrade in the environment due to the extremely strong C-F bonds, known as "permanent chemicals". Such substances are widely present in water source sites, fluorine chemical industry and electroplating wastewater, and cause great harm to the environment. Currently, methods for treating PFAS include high temperature incineration, plasma, electrochemical oxidation, advanced oxidation, etc., but most are difficult to thoroughly degrade, often yielding partially defluorinated intermediates. Secondly, the same treatment mode is adopted for all PFAS at present, and the effective degradation mode is not adopted according to the chemical bond of the PFAS or the characteristic of containing groups, which is one of the reasons that the PFAS cannot be completely degraded. Therefore, how to provide a technical scheme capable of realizing high-efficiency and even thorough degradation of fluorine-containing organic compounds (especially suitable for sewage treatment application scenes) is a technical problem to be solved in the field. Disclosure of Invention In view of the above, the application provides a degradation method of fluorine-containing organic compounds, which adopts an effective degradation method aiming at the characteristics of chemical bonds or groups contained in PFAS in sewage, so that the PFAS can be completely degraded, and the degradation efficiency is improved. According to the application, a degradation method of a fluorine-containing organic compound is provided, and the degradation method comprises the steps of detecting a water body to be treated in which the fluorine-containing organic compound is dissolved, so as to determine the content of the fluorine-containing organic compound with a target oxidizable group in the fluorine-containing organic compound in the water body to be treated, and mixing a strong oxidant with the water body to be treated if the content of the fluorine-containing organic compound with the target oxidizable group in the water body to be treated is greater than or equal to a threshold value, so that the strong oxidant and the fluorine-containing organic compound with the target oxidizable group are subjected to oxidation reaction. Preferably, the detection of the water body to be treated containing the fluorine-containing organic compound comprises the steps of measuring the total fluorine amount of the fluorine-containing organic compound in the water body to be treated, measuring the target total fluorine amount of the fluorine-containing organic compound with the target oxidizable group, and enabling the content of the fluorine-containing organic compound with the target oxidizable group in the fluorine-containing organic compound in the water body to be treated to be the ratio of the target total fluorine amount to the total fluorine amount. Preferably, the ratio is a mass ratio, a concentration ratio, a molar mass ratio or a molar concentration ratio. Preferably, the threshold is 50%, preferably 60%, more preferably 80%, more preferably 85%, more preferably 90%. Preferably, the fluorine-containing organic compound is a perfluoro and polyfluoroalkyl compound, and the target oxidizable group comprises at least one of a carboxylic acid group, a methylene group, a methine group, a carbon-carbon double bond, an amide bond and a sulfonamide group. Preferably, the perfluoro and polyfluoroalkyl compounds include perfluorocarboxylic acids, polyfluorocarboxylic acids, perfluoro/polyfluorosulfonic acids and precursors thereof, hydrogen-containing or chlorine-containing substituted perfluoro and polyfluoroalkyl compounds, ether-containing/branched/cyclic or end-group-modified perfluoro and polyfluoroalkyl compounds. Preferably, the oxidant is persulfate, and the concentration of the persulfate is 1mM-200mM. Preferably, the concentration of the persulfate is 20mM-100mM, preferably 100mM. Preferably, the persulfate is one of peroxymonosulfate and peroxydisulfate, and preferably is peroxydisulfate. Preferably, the peroxymonosulfate comprises at least one of sodium peroxymonosulfate, potassium peroxymonosulfate, ammonium peroxymonosulfate, sodium monopersulfate and potassium monopersulfate, and the peroxydisulfate comprises at least one of sodium peroxydisulfate, potassium peroxydisulfate, ammoni