Preparation of Silver Tungstate Antibacterial Agent by Cation Membrane Electrolysis

Silver tungstate, as a member of the functional tungstate system, is applied in biological, pharmaceutical, catalytic, environmental protection, electrode materials and other important fields because of its special functional transition metals.

At present, the antibacterial agent (also called antibacterial material) can be divided into three kinds of materials, organic antibacterial agent, inorganic antibacterial agent, and natural antibacterial agent in three categories. Inorganic antibacterial agents include activated carbon, silver, copper, zinc inorganic compounds, silver loaded ceramics and so on. In all metal ions, silver ions have the highest fungicidal activity, which can kill 650 kinds of bacteria, viruses and fungi. In recent years, inorganic antibacterial silver tungstate has been rapidly popularized because of its high safety and good effect of antibiosis and deodorization.

In the aspect of silver tungstate synthesis, more applications include sol-gel, spray pyrolysis, solid-state synthesis, molten salt method, mechanochemical synthesis, ultrasonic method, template method, hydrothermal method, etc. The above methods have their own advantages and disadvantages. A new silver tungstate preparation method, cationic membrane electrolysis, is briefly introduced.

The cationic film has certain selectivity, the cations were selected in the anode through the ion-exchange membrane to the cathode chamber, perfluorinated sulfonic acid cation exchange membrane can make Na⁺ ion in the anode chamber through the membrane to the cathode chamber, thus affecting the Na⁺ ion impurity elimination. Therefore, the cation membrane electrolysis method has a short reaction time, and the final silver tungstate products have high purity and no impurities.

Silver tungstate was prepared by cationic membrane electrolysis, because the cationic membrane used in the preparation process had a certain selectivity. Especially, the perfluorinated sulfonic cation exchange membrane can make the Na⁺ ions in the anode chamber penetrate the ion membrane into the cathode chamber, thereby eliminating the influence of Na⁺ ion impurities on the purity of the final product silver tungstate.

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