Preparation method and application of silver-silicon antibacterial composite material

Abstract

The invention relates to a preparation method of a silver-silicon antibacterial composite material. A device involved in the method is composed of a vacuum feeding machine, a vacuum feeding machine discharging port, a powder conveying pipeline, a transition bin feeding port, a transition bin, a transition bin discharging port, a helical ribbon mixer, a longitudinal solution conveying pipeline, a solution nozzle, a transverse solution conveying pipeline, a solution conveying bent pipe, a liquid storage tank, a light source, a mixer discharging port, a stock bin, a mixer support and moving wheels. Crystalline elemental silicon and silver nitrate are used as raw materials by adopting a dry method or a semi-dry method, the silver nitrate is sprayed on a silicon carrier to obtain semi-dry powder, the semi-dry powder is irradiated by ultraviolet light or sunlight, semiconductor silicon generates electrons and holes under an illumination condition, and the silver nitrate is reduced into the elemental silver after obtaining the electrons, so that the silver-silicon antibacterial composite material is formed. The method has the advantages of simple preparation process, low process energy consumption, no need of adding an additional reducing agent, and no silver ion precipitation. The removal rate of the composite material on escherichia coli, staphylococcus aureus, the total number of bacterial colonies and the like is up to 99%, and the composite material is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of silver-silicon antibacterial composite material. Background technique [0002] As the most commonly used inorganic antibacterial agent, nano silver has the advantages of high efficiency, safety, and broad antibacterial spectrum, so it is widely used in antibacterial and antifungal products. At the same time, nano-silver has high bactericidal selectivity, strong biocompatibility, and no harm to host cells, so it has become a hot spot in current scientific research. However, the poor dispersion of nano-silver and the difficulty of large-scale preparation are still huge challenges for its practical antibacterial application. At present, most of the preparation methods of nano-silver adopt wet method, that is, silver nitrate is reduced in aqueous solution with reducing agents such as sodium borohydride, citric acid, ascorbic acid, etc., so as to obtain a colloidal solution of nano-silver, but in practical a...

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Problems solved by technology

However, the poor dispersion of nano-silver and the difficulty of large-scale preparation are still huge challenges for its practical antibacterial application.

At present, most of the preparation methods of nano-silver adopt wet method, that is, silver nitrate is reduced in aqueous solution with reducing agents such as sodium borohydride, citric acid, ascorbic acid, etc., so as to obtain a colloidal solution of nano-silver, but in practical applications, antibacterial powder is mostly used The material is the main material, and the use of colloidal solution is limited. Therefore, researchers continue to use carriers to load nano-silver to obtain powder materials. Mainly use zirconium phosphate, activated carbon and polymers as carriers, and still use wet synthesis. Silver nitrate is adsorbed on the carrier, and then silver nitrate is reduced to nano-silver with reducing agents such as sodium borohydride, citric acid, ascorbic acid, etc. After reduction in aqueous solution, the carrier has a very low loading of nano-silver, and nano-silver aggregates and disperses Poor, nano-silver is easy to fall off from the carrier, the antibacterial stability and persistence are not ideal, it is difficult to achieve efficient antibacterial performance, in addition, the synthesis process is complicated, the cost is high, and it is difficult to achieve mass production

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