Method of dissolubility iron salt induction photochemical degradation total fluorination substituted compound

A technology for soluble iron and compounds, applied in the field of photochemical degradation of fluorine-containing organic substances, to achieve good degradation effects, prevent pollution, and reduce the toxicity of decomposition products

Inactive Publication Date: 2008-06-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are very limited reports on their degradation, namely, homogeneous photocatalytic degradation with heteropolyacid as catalyst, ph...

Method used

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  • Method of dissolubility iron salt induction photochemical degradation total fluorination substituted compound
  • Method of dissolubility iron salt induction photochemical degradation total fluorination substituted compound
  • Method of dissolubility iron salt induction photochemical degradation total fluorination substituted compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Example 1: UV (254nm) photolysis of perfluorooctanoic acid (PFOA) induced by soluble iron salts under different atmospheres

[0032] Such as figure 1 As shown, 500mL of mixed reaction solution containing PFOA (concentration of 48μM) and Fe was put into Reactor 3 2 (SO 4 ) 3 (wherein the concentration of Fe(III) is 50 μM). Oxygen enters the reactor 3 from the air inlet 5 through the gas distribution plate 4 at the bottom, and under the irradiation of a 23W ultraviolet lamp 1 with a dominant wavelength of 254nm, PFOA is decomposed and defluorinated. figure 2 , image 3 . The degradation rate is calculated according to the change of PFOA concentration in the solution, and the concentration of PFOA in the solution is analyzed by HPLC-conductivity detector. The defluorination rate is calculated according to the change value of fluoride ion concentration in water during the reaction process, and the fluoride ion concentration in water is measured by ion chromatography (...

Embodiment 2

[0033] Example 2: UV (254nm) photolysis of perfluorooctanoic acid (PFOA) induced by different concentrations of soluble iron salts under an oxygen atmosphere

[0034] Such as figure 1 As shown, 500mL of the mixed reaction solution containing PFOA (concentration of 48μM) and Fe 2 (SO 4 ) 3 (wherein the Fe(III) concentration is 0-80 μM). Oxygen enters the reactor 3 from the air inlet 5 through the gas distribution plate 4 at the bottom, and under the irradiation of a 23W ultraviolet lamp 1 with a dominant wavelength of 254nm, PFOA is decomposed and defluorinated. Figure 4 , Figure 5 . The degradation rate is calculated according to the change of PFOA concentration in the solution, and the concentration of PFOA in the solution is analyzed by HPLC-conductivity detector. The defluorination rate is calculated according to the change value of fluoride ion concentration in water during the reaction process, and the fluoride ion concentration in water is measured by ion chromat...

Embodiment 3

[0035] Example 3: Perfluorooctane sulfonic acid (PFOS) UV (254nm) photolysis induced by soluble iron salts

[0036] Such as figure 1 As shown, 500mL mixed reaction solution containing PFOS (concentration of 40μM) and Fe(NO 3 ) 3 (where the Fe(III) concentration is 30 μM). Oxygen enters the reactor 3 from the air inlet 5 through the gas distribution plate 4 at the bottom, and under the irradiation of a 23W ultraviolet lamp 1 with a dominant wavelength of 254nm, the decomposition effect of PFOS can be seen in Figure 4 . The degradation rate is calculated according to the change of PFOS concentration in the solution, and the concentration of PFOS in the solution is analyzed by HPLC-conductivity detector. After 240 minutes of reaction, 23% of PFOS was degraded.

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PUM

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Abstract

The invention discloses a method of dissolved ferric salt inducing photochemical degradation of total fluorine substitution compound, belonging to the technical field of photochemical degradation of fluorine-containing organic compound in environmental protection. Under the atmosphere of air, oxygen and nitrogen, the mixed solution of total fluorine substitution compound and dissolved ferric salt in the reactor produces the decomposition reaction under the light-source irradiation for 100 to 300 minutes, so that the fluorine atom turns into the fluorine ion. The method which is easy to apply can react under the normal temperature and normal pressure, without complex equipment and strict reaction condition. The toxicity of the decomposition product is reduced, so that other subsequent methods can be easily adopted for further disposal. In addition, in the reaction, the concentration of the dissolvable ferric salt is reduced and the total fluorine is degraded into the harmless substance to avoid the pollution of the total fluorine compound to the environment.

Description

technical field [0001] The invention belongs to the technical field of photochemical degradation of fluorine-containing organic substances in environmental protection, and in particular relates to a method for inducing photochemical degradation of perfluorinated compounds by a soluble iron salt used for eliminating perfluorinated compounds in water, air and soil. Background technique [0002] Perfluorinated compounds (PFCs) refer to organic compounds in which all hydrogens connected to carbon atoms in the organic structure are replaced by fluorine, such as perfluorooctanoic acid (PFOA)--CF 3 -CF 2 -CF 2 -CF 2 -CF 2 -CF 2 -CF 2 -COOH and perfluorooctylsulfonate (PFOS) CF 3 -CF 2 -CF 2 -CF 2 -CF 2 -CF 2 -CF 2 -CF 2 -SO 3 H. Perfluorinated compounds have been used since the 1950s and are widely used in industrial and consumer products, including surface treatment agents, surfactants, pesticide components, etc. It enters the environment through two routes, the di...

Claims

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Application Information

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IPC IPC(8): A62D3/176A62D101/22
Inventor 张彭义王媛
Owner TSINGHUA UNIV
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