Electrochemical method and electrochemical device for synergistically generating ozone and hydrogen peroxide in neutral medium

Abstract

The invention provides an electrochemical method and an electrochemical device for synergistically generating ozone and hydrogen peroxide in a neutral medium. The method comprises the following steps: oxygen is subject to reduction on an air-diffusion cathode to generate hydrogen peroxide and water is subject to oxidation decomposition on an anode to generate ozone in the same electrolytic cell. The device comprises a membrane electrode formed by hot-pressing a proton exchange membrane and the anode. The water solution of an inert salt, such as sodium sulfate or potassium sulfate, and sodium phosphate or potassium phosphate, or the mixed solution of the inert salts constitutes the electrolyte in a cathode chamber, while pure water without electrolytes or the same solution as that of the cathode chamber constitutes the electrolyte in an anode chamber. The cathode chamber and the anode chamber are separated by the proton exchange membrane, so as to prevent the generated ozone and hydrogen peroxide from being further subjected to electrochemical reduction or oxidation. Accordingly, the hydrogen peroxide with higher concentration can be obtained in the cathode chamber, and meanwhile, the ozone can be effectively generated in the anode chamber. The method and the device of the invention are also applicable to synergistic wastewater treatment using ozone and hydrogen peroxide.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment / applied chemistry, and specifically relates to a method and device for synergistic electrochemical generation of ozone and hydrogen peroxide in a neutral medium. Background technique: [0002] Ozone (O 3 ) and hydrogen peroxide (H 2 o 2 ) are all strong oxidizing agents, which are widely used in the fields of environmental engineering, chemical engineering, agriculture, etc., and the products after their own decomposition are only oxygen and water, and generally do not produce toxic chlorinated hydrocarbons. The generation of ozone often adopts the method of high-voltage discharge to oxygen or air. When the generated ozone is used for water treatment, it still needs to dissolve the ozone in the water through the gas distribution device. The existing technology of electrochemically splitting water to generate ozone only produces ozone at the anode, and the cathode reaction...

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Problems solved by technology

[0010] In the field of water treatment, hydrogen peroxide or ozone treatment alone is often not as effective as ozone synergistic hydrogen peroxide treatment, because hydrogen peroxide and ozone synergy can produce more strong oxidizing hydroxyl radicals

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