Advanced reduction method and device for high-frequency ultrasonic degradation of perfluorooctane sulfonate in water

Abstract

The invention provides an advanced reduction method and device for degrading perfluorooctane sulfonate in water through high-frequency ultrasonic reduction. The device comprises a high-frequency ultrasonic generator, a reactor used for containing a perfluorooctane sulfonate aqueous solution and a constant-temperature cooling tank. According to the method, the device is utilized, reducing agent-hydrated electrons are generated through high-frequency ultrasonic induction under the strong alkaline condition, and the reducing agent-hydrated electrons are used for degrading perfluorooctane sulfonate. Compared with a conventional photochemical degradation method, a photoinitiator does not need to be added in the reaction, so that the cost is saved, and secondary pollution is avoided; special reaction equipment is not needed, so that the cost is saved; final products of a reaction system are F <->, SO4 <2-> and part of fluorine-containing olefin or alkane, and secondary pollution is avoided.

Description

technical field [0001] The application of the present invention relates to a method and device for degrading perfluorooctane sulfonic acid (PFOS) by using high-frequency ultrasonic induction to generate reducing agent-hydration electrons under strong alkaline conditions, and belongs to the technical field of water treatment . Background technique [0002] Due to its excellent physical and chemical properties such as strong chemical and thermal stability, hydrophobic and oleophobic, and low surface tension, perfluorinated compounds have been widely used in the production and use of textiles, leather, ink coatings, foam fire extinguishing agents, emulsifiers, etc. , and subsequently spread to various environmental media. As the most common type of perfluorinated compounds, perfluorooctane sulfonic acid (PFOS) has been detected in water, air, soil, human body and other environmental media, so it has gradually attracted attention. Recent studies have shown that PFOS is environ...

AI Technical Summary

Problems solved by technology

Hydrated electrons can be generated by anion photolysis (such as UV / KI, UV / SO32-) or irradiating pure water, but such methods need to add photoreaction initiators to water or have special equipment requirements (laser flash photolysis, pulse radiolysis equipment, etc.), the cost is relatively high, and it is easy to cause secondary pollution

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