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

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...

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Problems solved by technology

There are very limited reports on their degradation, namely, homogeneous photocatalytic degradation with heteropolyacid as catalyst, photochemical degradation with persulfate as oxidant, reduction of zero-valent iron under subcritical conditions, and sonochemical degradation.

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