Nano silver colloid aqueous solution preparation method using sodium cellulose glycolate

Abstract

The invention discloses a method for preparing a nanometer silver colloid aqueous solution by adopting sodium carboxymethyl cellulose. The method comprises the following steps: a silver nitrate solid is dissolved in deionized water so as to prepare a silver nitrate aqueous solution A; sodium carboxymethyl cellulose is dissolved in deionized water so as to prepare a solution B; the solution A and the solution B are mixed, wherein the concentration of silver nitrate is 5*10<-5>-2.5*10<-2> mol / l, and the concentration of the sodium carboxymethyl cellulose is 0.2 to 25 g / l; the pH value of the solutions is controlled between 7 and 11; and the solutions react for 2 to 20 hours at a temperature between 15 and 90 DEG C, so as to obtain the aqueous solution containing silver colloid particles with the average particle size less than 100 nanometers. The nanometer silver colloid aqueous solution obtained by the method is brownish-grey at high concentration and is transparent bright yellow after dilution. The prepared nanometer silver colloid particles are stable in shape, good in dispersibility, adjustable and controllable in particle size distribution. The method has the advantages that the method adopts a common reaction vessel for reaction, and is simple in process, little in equipment investment and easy to implement, and raw materials involved in the reaction are friendly to environment, free from pollution, few in product impurities and convenient for post-treatment.

Description

technical field [0001] The invention discloses a method for preparing nano-silver colloid aqueous solution by using sodium carboxymethyl cellulose, a green chemical process for preparing nano-silver colloid aqueous solution by using carboxymethyl cellulose sodium as a chemical reducing agent and a protective agent at the same time under mild conditions , which belongs to the technical field of medical sterilization, metal photoelectricity and catalytic nano functional material synthesis. Background technique [0002] In recent years, with the wide application of nano-silver materials in the fields of superconductivity, antibacterial, biology, catalysis, microelectronics and photonic crystals, various related preparation technologies have also been developed rapidly. The liquid-phase chemical reduction method adopted in the present invention has a complete theoretical system, good equipment foundation, mature process conditions, and easy control. It has significant advantages...

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Problems solved by technology

Disclosed a kind of method that adopts sodium carboxymethyl cellulose as reductant and protective agent to prepare nano-silver particles as Chinese patent CN101121203A simultaneously, but the molecular weight range of the sodium carboxymethyl cellulose that it uses is unknown, prepares the product The size and shape of the particles are not uniform, and an additional microwave heating device is required in the implementation process, which is not conducive to large-scale industrial production; although the method described in the Chinese patent CN1686646A can obtain monodisperse nano silver with controllable particle size through the water system Particles, but the preparation process needs to be assisted by ultrasonic devices and high-speed stirring, which increases the investment in equipment; A simple and "green" method for the synthesis of Au, Ag in the 8th issue of the Green Chemistry journal published by the Royal Society of Chemistry in 2006 , andAu-Ag alloy nanoparticles discloses a green nano-silver particle preparation process using glucose as a reducing agent and soluble starch as a protective agent. There are deficiencies in the simplicity of the method and the method

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