Method for preparing nanometer sliver colloid with liquid phase reduction method

Abstract

The invention discloses a method for preparing nanometer sliver colloid with a liquid phase reduction method. Chitosan is dissolved in acetic acid to obtain chitosan acidic solution, and the chitosan acidic solution mixes with trisodium citrate solution to obtain a mixed solution A. Under water-bath conditions, silver nitrate solution is heated to 60-80 DEG C, the solution A is added in the silver nitrate solution drop by drop and the solution is stirred until the solution turns into light yellow and boils to obtain a result nanometer sliver colloid. Standard silver nitrate liquid serves as raw materials, the chitosan acidic solution is a reducing agent, chitosan serves as a stabilizing agent, and the environmental pollution is reduced. The reaction time is substantially shortened, the energy consumption during a preparation process is reduced, and the cost is lowered. The prepared nanometer sliver colloid is regular in shape, and the size is controllable. The nanometer sliver colloid is excellent in dispersibility, and high in stability, and the particle size distribution ranges 10nm to 30nm.

Description

technical field [0001] The invention belongs to the technical field of preparation of noble metal nanoparticles, and in particular relates to a method for preparing nano-silver colloid by a liquid phase reduction method. Background technique [0002] Nanomaterials are in the transition region between atomic clusters and macroscopic objects in the microstructure, and have their unique properties and functions, such as small size effect, quantum size effect, surface effect and macroscopic quantum tunneling effect. Studies have found that nano-silver particles have strong antibacterial properties, good electrical conductivity and stable optical properties, especially as catalysts, with high chemical and catalytic activities. Therefore, more and more researchers are devoted to the preparation and research of silver nanoparticles. [0003] At present, there are many methods for preparing nano-silver colloids. In addition to liquid phase reduction methods, there are physical meth...

AI Technical Summary

Problems solved by technology

The main disadvantage of ray irradiation method is that it requires high equipment and high cost.

The process of precipitation method is short, easy to operate and easy to obtain raw materials, but it is easy to introduce impurities, low purity and large particle size

The microbial reduction method has a wide range of raw materials, cheap and easy to obtain, mild reaction conditions, and few toxic by-products, but it is difficult to find new strains with strong enzymatic or non-enzymatic reduction of silver ions. At the same time, nano-silver products lower purity

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