Preparation method of silver-loaded mesoporous silicon dioxide antibacterial agent
The invention discloses a preparation method of a silver-loaded mesoporous silicon dioxide antibacterial agent. The preparation method disclosed by the invention comprises the following steps: dissolving a template agent, a silicon source and silver nitrate in water to obtain a silver sol solution, adding a chloride aqueous solution into the silver sol solution, stirring and mixing to form silicon dioxide/silver chloride gel, drying gel, and carrying out thermal treatment to obtain the mesoporous silicon dioxide antibacterial agent containing elemental silver. The prepared silver-loaded mesoporous silicon dioxide antibacterial agent is 200-1000 cm<2>/g in specific surface area, 5-30 nm in aperture and 1.0-5.0 cm<3>/g in pore volume; the mass percentage of elemental silver is 10-30%. The antibacterial agent prepared by the preparation method disclosed by the invention keeps the ordered porous structure, the uniform aperture, the larger specific surface area and the pore volume of the carrier material; the antibacterial agent prepared by the preparation method disclosed by the invention has the characteristics of being easy for controlling the content of antibacterial active bodies, simple in preparation method, broad-spectrum in antibacterial property, durable in antibacterial efficiency, steady in antibacterial property, nontoxic to human body and the like and can be widely applied in the fields of ceramics, plastics, textiles, coatings, water treatment and the like. 1. A method for preparing silica the silver lies between the hole of antibacterial agent, characterized in that the steps of this method are as follows: (1) the quality and water according to the percentage of agent 0.01-0.1: 1 uniform mixing, stirring to clarify, then adding silicon source and silver nitrate, in which the silicon source is the template for the mass percentage of 0.1-0.5: 1, the mass percentage of silver nitrate with the template agent is 0.05-0.1: 1, in 200-400 revolutions/minutes stirring under 6-12 hours, then heating to 50-80 the [...] , continue to stir 2-6 hours, silver sol solution obtained; (2) in the the silver sol solution 200-400 revolutions/minutes stirring under 2-6 hours, in the stirring process dropping quality percentage concentration is 0.1% of the chloride aqueous solution, until the sol solution and chloridion of the silver ion in the mol ratio of the 1 [...] 1, obtain the silicon dioxide/silver chloride gel; (3) the silicon dioxide/silver chloride gel after vacuum drying, the the 400-600 [...] to its heat treatment is carried out under 2-10 hours, get silver mesoporous silicon dioxide antibacterial agent. 2. A method for preparing silica the silver lies between the hole of antibacterial agent according to Claim 1, characterized in that the template agent is polyethylene glycol-polypropylene glycol-polyethylene glycol block copolymer, sodium dodecyl benzene sulfonate, hexadecyltrimethyl ammonium bromide, polyvinyl-pyrrolidone or sodium dodecyl sulfate. 3. A method for preparing silica the silver lies between the hole of antibacterial agent according to Claim 1, characterized in that the silicon source is ethyl silicate, propyl silicate is, is isopropyl or butyl silicate. 4. A method for preparing silica the silver lies between the hole of antibacterial agent according to Claim 1, characterized in that the chloride is sodium chloride, potassium chloride, zinc chloride or hydrogen chloride.