Preparation method and application of a high-concentration free radical electrode

Abstract

The invention discloses a method for preparing a high-concentration free radical electrode. In the method, a spherical hollow titanium substrate is subjected to roughening treatment, and the roughened titanium substrate is subjected to electroless plating to form a tin-antimony oxide bottom layer on the surface of the titanium substrate, and then Place the electroless-plated titanium substrate in an alkaline plating solution for alkaline electroplating, and generate α‑PbO on the bottom layer of the titanium substrate 2 layer, followed by acid composite plating, in α‑PbO 2 Rare earth metals and β-PbO are generated on the layer 2 The active layer; using a laser puncher with carbon dioxide as the laser source, the through-holes are processed on the surface of the spherical hollow titanium substrate by the laser replication drilling method to obtain a spherical hollow high-concentration free radical electrode; the specific surface area of ​​the electrode prepared by this method is Large, high porosity, fast free radical generation rate and high concentration, the electrode is applied in the treatment of organic pollutants, the treatment process is short, the energy consumption is low, and the pollutants can be quickly and effectively degraded into small molecular substances and harmless CO 2 and H 2 O.

Description

technical field [0001] The invention relates to a preparation method and application of a high-concentration free radical electrode, belonging to the field of organic pollutants. Background technique [0002] The electrocatalytic oxidation method refers to the direct oxidation of organic pollutants on the surface of electrode materials with electrocatalytic properties during the electrolysis process, or the indirect oxidation of organic pollutants by electrode materials through electrochemical action to generate free radical groups with strong oxidation ability, and finally make them completely degrades into harmless CO 2 and H 2 The green chemical technology of O; in the process of electrocatalysis, the modifiers on the electrode surface or in the solution phase can promote or inhibit the redox reaction of gaining and losing electrons on the working electrode under the action of an electric field, while the modifiers on the electrode surface or in the solution phase themse...

AI Technical Summary

Problems solved by technology

[0004] At present, the electrode materials have the following problems (1) Organic pollutants are mainly oxidized and degraded by strong oxidizing groups such as hydroxyl radicals, but the concentration of free radicals generated by the electrode is low, and the degradation rate is slow

(2) During the use of metal electrodes, especially under oxidation, oxidation reactions are prone to occur to form oxide films, resulting in electrode passivation and deactivation

Although platinum group metals have high stability and oxidation activity, their cost is too high

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