Nano composite anti-bacterial agent and preparation method

A technology of nanocomposite and antibacterial agents, applied in the field of nanocomposite antibacterial agents and their preparation, can solve the problems of high cost, achieve low cost, promote photocatalytic activity, and degrade organic pollutants

Inactive Publication Date: 2006-04-19
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for independent use of nanoparticles called silver or zinc oxide (ZNO) that have both germ killing properties and catalysts against harmful substances such as chemical oxygen demand (CO2) from indoor environments like homes. It improves their effectiveness by increasing its ability to kill microorganisms while reducing environmental impact on human health caused due to exposure.

Problems solved by technology

This patents discusses different types of chemical substances called biologies like enzyme compounds, nanoporous materials containing metals, ceramics, polymer composites, and others. These chemically diverse substance sources contribute towards increased risk of harmful diseases including cancer and respiratory illnesses. To address these issues, an effective anti-microbile agent needs to possess both autofluidability and self cleaning capabilities against photooxidiary acid catalysts while being able to resist decompositions from organism tissues and self purifying within certain environments.

Method used

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  • Nano composite anti-bacterial agent and preparation method

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preparation example Construction

[0036] (1) Preparation of precursors

[0037] First, prepare a certain concentration of zinc sulfate or zinc nitrate, silver nitrate and ammonium bicarbonate aqueous solution as required. Take a certain amount of zinc sulfate or zinc nitrate solution with a concentration of 0.5 to 5 mol / L and place it in a container, at a temperature of 10 to 90 °C, keep stirring, and dropwise add the same volume of solution at a rate of 2 to 15 ml / s. 0.5~5mol / L ammonium bicarbonate solution, after the dropwise addition of ammonium bicarbonate is completed, continue to stir for 0.5~3 hours, and then dropwise add the same volume and concentration at the same time at a dropping speed of 2~15ml / s to Ag: ZnO=(1~50):(50~99) silver nitrate and ammonium bicarbonate, after the solution is added dropwise, the reaction is stopped after continuing to stir for 0.5~3 hours. The precursor mixture is then washed with doubly distilled water and / or absolute ethanol and centrifuged to separate out the precurso...

no. 1 Embodiment approach

[0041] The first specific embodiment of the preparation method of the nanocomposite antibacterial agent of the present invention is as follows:

[0042] Take 200ml of zinc sulfate solution with a concentration of 1~2mol / L in a three-necked flask, keep stirring at a temperature of 20~50℃, and add 200ml of 1~2mol / L carbonic acid dropwise at a dripping speed of 3~8ml / s Ammonia hydrogen solution, after the dropwise addition of ammonium bicarbonate, continue to stir for 0.5 hours, and then dropwise at a rate of 2 to 6ml / s at the same time. 100ml each of L silver nitrate and 0.1-1mol / L ammonium bicarbonate. After the solution was added dropwise, the reaction was stopped after continuing to stir for 0.5 to 1 hour. The precipitate was then washed with double distilled water and absolute ethanol and centrifuged to isolate the precursor, followed by vacuum drying. The dried precursor is placed in a box-type resistance furnace, heated to 430-460 ° C at a certain speed under the air, an...

no. 2 Embodiment approach

[0043] The second specific embodiment of the preparation method of the nanocomposite antibacterial agent of the present invention is as follows:

[0044] Take 200ml of zinc sulfate solution with a concentration of 0.5~1.5mol / L in a three-necked flask, under the temperature of 20~50℃, keep stirring, and add 200ml of 0.5~1.5mol / L dropwise at a dripping speed of 3~8ml / s. L ammonium bicarbonate solution, after the dropwise addition of ammonium bicarbonate is completed, continue to stir for 1 hour, and then at the same time dropwise at a rate of 2~6ml / s, the concentration of Ag:ZnO=10:90 by mass ratio is 0.1~ 1 mol / L silver nitrate and 100 ml each of 0.1-1 mol / L ammonium bicarbonate. After the solution was added dropwise, the reaction was stopped after continuing to stir for 0.5 to 1.5 hours. The precipitate was then washed with doubly distilled water and / or absolute ethanol and centrifuged to isolate the precursor, followed by vacuum drying. The dried precursor is placed in a va...

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Abstract

A composite nano-class antibacterial agent contains nano-zinc oxide and nano-Ag, and is prepared through proportionally dissolving zinc sulfate (or nitrate) in solvent, stirring while dripping solution of ammonium dicarbonate for reaction, stirring, dripping the solution of silver nitrate and ammonium dicarbonate, stirring, washing, centrifugal separation to obtain the precursors of nano-Ag and nano-zinc oxide, vacuum drying and sintering.

Description

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Claims

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Application Information

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Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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