Electrochemical methods have a good effect on the treatment of refractory organics, which can convert non-biodegradable organic matter into biodegradable organic matter. The electrochemical conversion reaction rate of organic substances is generally slow, so it is commonly used to increase the overpotential of the electrode, increase the surface area of ​​the electrode, select an excellent electrode material, and improve the electrode structure. In electrochemical reactions, the surface area of ​​the electrode is accompanied by a heterogeneously catalyzed reaction as the charge moves, which is similar to chemical catalysis. In a certain electrolyte, under the same overpotential, the electrode reaction rate and the reaction type vary depending on the electrode matrix material, which is collectively referred to as electrocatalysis in the electrochemical. In an electrocatalytic reaction, as an electrocatalyst, different electrode materials can cause an order of magnitude change in the electrochemical reaction rate. Therefore, selecting an appropriate electrode material is an effective way to improve the efficiency of electrochemical catalytic reaction.
In the field of water treatment, especially in the electrolysis process of water, such as the formation of acid, alkali ion water, there are various strong oxidants in the water, such as: O3, H2O2, HCLO, etc., and the anode is often reversing, so Special functional electrodes must be used. After years of research, our company has developed a long-life electrode suitable for water treatment – titanium coated electrode. The electrode is coated on a pure titanium substrate with a platinum group noble metal oxide having high electrocatalytic performance, strong oxidation resistance and good electrical conductivity, and is an insoluble anode. The characteristics of the anode are:
1. Titanium has the characteristics of light specific gravity, good strength, corrosion resistance and good performance. Especially the resistance to wet chlorine is unmatched by other metal materials. For example, when there is a trace amount of chloride ion in the electrolysis of water, the stainless steel plate will quickly pitting, which shortens the life of the electrode, and titanium does not have these problems.
2. In the coating, due to the addition of a variety of platinum group noble metals, the current efficiency is high, the conductivity is good, the electrocatalytic performance is good, the oxidation resistance is strong, the working life is long, and energy is saved.
3. Have good reverse performance.
Titanium anode is a key component in the electrolysis water machine. The quality of the metal electrode directly affects the quality of the water machine. How to choose the electrode should be reasonably selected according to the nature of the work. In the field of water treatment, the metal electrode must have the following basic requirements:
1. Has good electrical conductivity.
2. Strong corrosion resistance.
3. Good mechanical strength and processing performance.
4. Long working life.
5. Have good electrocatalytic performance and so on.
Multicomponent electrodes are also an important research aspect in electrochemical reactions. The preparation of Ti/Sn02·Sb203″Mn02/Pb02·Mn02 anode can be used as an example of multi-component electrode design. The main reason for the failure of titanium anode is the diffusion of new ecological oxygen generated by oxygen evolution reaction to the surface of the electrode, thus on the surface of titanium. A non-conductive TiO2 film is formed. In order to activate the anode, a PbO2·MnO 2 active layer is added on the surface of the electrode; in order to reduce the diffusion of new ecological oxygen onto the titanium surface, a layer of SnOz·Sb203 is added between the titanium anode substrate and the active layer. · Mn02 intermediate layer. In the treatment of phenol-containing sewage, the anode has high electrocatalytic activity and electrochemical stability.