Preparation method for silver-containing titanium dioxide antibacterial agent

Abstract

The invention discloses a preparation method for silver-containing titanium dioxide antibacterial agent. The preparation method comprises the following steps: (1) adding butyl titanate into absolute ethyl alcohol, continuously stirring until the absolute ethyl alcohol finishes being dripped, dripping dilute nitric acid, stirring by magnetic force for 20-30min under a water bath condition of 30-60DEG C to obtain titanium dioxide sol, wherein the volume ratio of butyl titanate, absolute ethyl alcohol to dilute nitric acid is 5:(10-20):(0.5-1.5); (2) adding silver nitrate solution into the titanium dioxide sol, stirring for 10-20min, dripping 3% ammonium hydroxide until sediments just disappear, then, adding formaldehyde solution, carrying out magnetic stirring for 2-3h under a water bath condition of 50-60DEG C to obtain silver-titanium dioxide sol mixture; (3) carrying out centrifugation on the above silver-titanium dioxide sol mixture, cleaning the sediments with ethanol aqueous solution for 3-5 times, and drying in a drying oven at the temperature of 50-60DEG C for 10-20h to obtain the silver-containing titanium dioxide antibacterial agent. In the silver-containing titanium dioxide antibacterial agent, titanium dioxide can favorably load and fix silver nanoparticles, and the silver nanoparticle has long-acting antibacterial activity.

Description

technical field

[0001] The invention relates to the technical field of materials, in particular to a preparation method of a silver-containing titanium dioxide antibacterial agent. Background technique

[0002] Antibacterial agents, as a class of preparations whose main function is to kill and inhibit the growth of microorganisms, are mainly divided into two types: organic antibacterial agents and inorganic antibacterial agents. Among them, organic antibacterial agents have the characteristics of low cost and strong pertinence, but have problems such as poor broad-spectrum and poor heat resistance. Inorganic antibacterial agents have the advantages of long-acting and broad-spectrum, and are currently one of the research hotspots in this field.

[0003] Inorganic antibacterial agents are divided into two categories: oxide semiconductor light-activated antibacterial represented by titanium dioxide and heavy metal sterilized represented by silver. Titanium dioxide has a wide r...