Preparation method of all-silicon molecular sieve encapsulated nano-silver bactericide

Abstract

The invention belongs to the technical field of bactericide preparation, and particularly relates to a preparation method of an all-silicon molecular sieve encapsulated nano-silver bactericide, the preparation method comprises the following steps: introducing a nano-silver precursor complex formed by (3-mercaptopropyl) trimethoxysilane and silver nitrate into a synthesis system of an all-silicon molecular sieve, encapsulating the nano-silver precursor into the all-silicon molecular sieve through in-situ static crystallization; and finally, preparing the all-silicon molecular sieve encapsulated nano-silver bactericide through high-temperature roasting and hydrogen reduction. On one hand, silver ions are prevented from being precipitated under the coordination action of (3-mercaptopropyl) trimethoxysilane and the silver ions, and the silver ions are uniformly dispersed in pore channels of the molecular sieve under the interaction of (3-mercaptopropyl) trimethoxysilane and the molecular sieve precursor. On the other hand, the release rate of the silver ions can be effectively limited by the limited aperture of the molecular sieve, the sudden release phenomenon is avoided, the purpose of slow release control is achieved, and the bactericide has a wide application prospect as a broad-spectrum bactericide.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-silver bactericide, and in particular relates to a method for preparing a nano-silver bactericide encapsulated by an all-silicon molecular sieve. Background technique [0002] Silver ions have a strong bactericidal effect. Studies have shown that in water or air containing water, the surface of nano-silver will be oxidized and free traces of silver ions, and when the concentration of silver ions reaches 0.01ppm, it will have a good bactericidal effect After the bacteria die, silver ions can be released again to continue to play a bactericidal function. Therefore, nano-silver is a high-quality and long-lasting bactericide. However, if nano-silver is used directly for sterilization, there are problems such as high price, easy aggregation, and unstable release. For many years, scientists have been trying to uniformly load nano-silver in various carriers to obtain better bactericidal effec...

AI Technical Summary

Problems solved by technology

Although the above methods can all synthesize molecular sieve-encapsulated nano-silver fungicides, during the loading process, a part of the metal precursor is inevitably adsorbed on the outer surface or skeleton of the carrier, resulting in uneven distribution of Ag, which in turn leads to the release of Ag fungicides. If the rate is too fast, it will eventually affect the bactericidal performance

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