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Preparation method of silver-supported titanium dioxide inorganic antiseptic

An inorganic antibacterial agent, titanium dioxide technology, applied in the field of preparation of titanium dioxide silver-loaded particles, can solve the problems of not being environmentally friendly and complicated processes, and achieve the effects of small size, simple preparation process, and prevention of agglomeration and growth

Active Publication Date: 2015-01-28
南京丰浩华食品供应链管理有限公司
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  • Claims
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Problems solved by technology

However, most of the current synthesis methods need to add complexing agents, stabilizers and other organic solvents in the preparation process and the process is complicated; while other preparation methods with relatively simple processes, such as wet chemical methods, inevitably require filtration, suction filtration and other steps to produce A lot of waste liquid, not environmentally friendly

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  • Preparation method of silver-supported titanium dioxide inorganic antiseptic

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preparation example Construction

[0017] A preparation method of titanium dioxide silver-loaded composite, its concrete steps are as follows:

[0018] A. Use sodium hydroxide and ammonia water to drip into the silver nitrate solution in turn to configure 0.002 ~ 0.2mol / L silver ammonium solution, and the pH value is controlled at 11.3 ~ 12.6;

[0019] B. Continuously drip the above-mentioned silver ammonium solution into a certain amount of nano-titanium dioxide, and vibrate continuously to make it wet evenly. When the solution is added dropwise, the titanium dioxide is just fully wetted, and then the sample is naturally dried at room temperature for 24 hours. ~ 48 hours;

[0020] C. Irradiate the dried sample under the ultraviolet light source for 1 hour to 6 hours to prepare the titanium dioxide-supported silver inorganic antibacterial agent.

[0021] Note: The input amount of the above-mentioned silver-containing salt and titanium dioxide can be calculated according to the content ratio of titanium dioxide...

Embodiment 1

[0023] Drop sodium hydroxide solution into the silver nitrate solution to form a white precipitate and then turn into a brown precipitate, then add ammonia water dropwise until the precipitate disappears and the pH value rises to 11.8 with a concentration of 0.02mol / L silver ammonium solution. Continuously drip 2.6 mL of silver ammonium solution into 1.0 g of titanium dioxide powder, and vibrate continuously to make it wet evenly. When the silver ammonium solution was added dropwise, the sample was naturally dried at room temperature for 48 hours. Then the dried sample is irradiated under the ultraviolet light source for 1 hour to prepare the titanium dioxide silver-loaded inorganic antibacterial agent. figure 1 Its scanning transmission electron microscope image is given by figure 1 It can be seen that the silver particles are highly dispersed on the surface of titanium dioxide, the distribution is uniform, the particle size is uniform, and the average particle size is 1.9 n...

Embodiment 2

[0025] Drop sodium hydroxide solution into the silver nitrate solution to form a white precipitate and then turn into a brown precipitate, then add ammonia water dropwise until the precipitate disappears and the pH value rises to 11.3 with a concentration of 0.05mol / L silver ammonium solution. Continuously drip 2.6 mL of silver ammonium solution into 1.0 g of titanium dioxide powder, and vibrate continuously to make it wet evenly. When the silver ammonium solution was added dropwise, the sample was naturally dried at room temperature for 36 hours. Then the dried sample is irradiated under the ultraviolet light source for 3 hours to prepare the titanium dioxide silver-loaded inorganic antibacterial agent.

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Abstract

The invention discloses a preparation method of a silver-supported titanium dioxide inorganic antiseptic. The method comprises the following steps: sequentially adding sodium hydroxide and ammonia water into a silver salt solution in a dropwise manner to prepare a Tollen's reagent with a certain concentration, controlling the pH value, adding the Tollen's reagent solution into a certain amount of titanium dioxide powder in a dropwise manner through an incipient wetness process, and continuously vibrating to make the powder uniformly wetted, carrying out room temperature drying, and reducing to obtain the silver-supported titanium dioxide inorganic antiseptic. The method has the advantages of simple operation, environmental protection, effective prevention of the agglomeration growth of silver particles in the subsequent processing through inducing the formation of strong interaction between diammine silver ions and the surface of titanium dioxide by adjusting the hydroxy charges on the surface of titanium dioxide via adjusting the pH value, effective guarantee of the high dispersion of the silver particles on the surface of titanium dioxide, and improvement of the antibacterial properties of silver-supported titanium dioxide inorganic antibacterial materials.

Description

technical field [0001] The invention relates to a preparation method of an inorganic composite material, in particular to a preparation method of titanium dioxide silver-loaded particles. 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...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01P1/00A01P3/00
Inventor 曹崇江胡秋辉宋伟杨文建鞠兴荣
Owner 南京丰浩华食品供应链管理有限公司
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