Application of bismuth trioxide as bactericide

A technology of bismuth trioxide and fungicide, which is applied in the direction of application, biocide, disinfectant, etc., and can solve the problems of copper fungicide's poor effect, application restrictions, and limited application range, etc.

Active Publication Date: 2022-03-01
ZHONGKE YOUPIN (TIANJIN) TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, the most commonly used inorganic antibacterial agents are silver series antibacterial agents, which have a good bactericidal effect, but are relatively expensive, easy to change color, and silver has cumulative toxicity, so its application is limited
Copper fungicides are not as effective as silver fungicides, and copper oxide itself is very heavy in color and has certain toxicity, which limits its application range
Other commonly used inorganic antibacterial agents such as titanium dioxide and molybdenum trioxide are 2B carcinogens, and their long-term safety is doubtful

Method used

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  • Application of bismuth trioxide as bactericide
  • Application of bismuth trioxide as bactericide
  • Application of bismuth trioxide as bactericide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: The antibacterial substance bismuth trioxide (CAS registration number 1304-76-3), when nanometer-sized particles or micron-sized particles are used alone, can kill multidrug-resistant Gram-negative bacteria and Gram-negative bacteria. Lambert-positive bacteria, among them, micron-sized bismuth trioxide can be directly purchased commercially.

[0028] And the preparation method of nano bismuth trioxide is as follows:

Embodiment 2

[0029] Example 2: At room temperature, weigh 14.00 g of sodium bismuthate and put it into a 250 ml Erlenmeyer flask, add 80 ml of deionized water, and use a polytetrafluoroethylene rotor. The Erlenmeyer flask was fixed in an oil bath on a heating stirrer, and the system was taupe at this time. Afterwards, 5 mmol / ml aqueous HCl solution was added dropwise under ultrasonication until the pH was adjusted to 1, at which time the color of the system became lighter. Continue ultrasonic stirring at 80°C for 2h. After that, when the temperature of the reaction system drops to room temperature, centrifuge the reaction system at 4200rpm for 8 minutes, measure the pH of the supernatant, if the supernatant is acidic, add deionized water, stir the system evenly, and continue centrifugation under the same conditions . If the supernatant is neutral, collect the precipitate, wash once with deionized water, and collect the product. Put the product in a 100-degree oven to dry, and at this ti...

Embodiment 3

[0030] Example 3: At room temperature, weigh 14.00 g of sodium bismuthate and put it into a 250 ml Erlenmeyer flask, add 25 ml of deionized water and a Teflon rotor. Then drop 100mL of HNO 3 (5mmol / ml) solution, stirring at room temperature for 2h, will slowly precipitate out. The precipitate was collected and then washed with HNO 3 (5 mmol / ml) solution, followed by deionized water. Dry the product in a 100 degree oven. Afterwards, the product is placed in a tube furnace and calcined at 5°C per minute to 340°C for 2 hours in an atmosphere of 4% hydrogen and 96% nitrogen. After cooling, nanometer bismuth trioxide is obtained, which is a light white yellowish powder solid.

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Abstract

The invention belongs to the field of bactericides, and particularly relates to application of bismuth trioxide as a bactericide. The bismuth trioxide is prepared by adopting one of the following modes: a method I, dropwise adding a hydrochloric acid aqueous solution into a sodium bismuthate aqueous solution at room temperature under an ultrasonic condition until the solution is acidic, drying the obtained precipitate, heating and reacting in a muffle furnace, and cooling to obtain nano bismuth trioxide; a second method comprises the following steps: at room temperature, dropwise adding a nitric acid aqueous solution into a sodium bismuthate aqueous solution until the solution is acidic, drying the obtained precipitate, carrying out staged heating reaction in a tubular furnace, and cooling to obtain nano bismuth trioxide; and a third method comprises the following steps: putting metal bismuth into deionized water, and after laser irradiation, removing the metal bismuth to obtain the water-phase dispersed nano bismuth trioxide. Compared with commercially available micron-sized bismuth trioxide, the inorganic metal oxide bismuth trioxide prepared by the three methods provided by the invention has good antibacterial activity, and can effectively kill gram-negative bacteria and gram-positive bacteria, including drug-resistant strains.

Description

technical field [0001] The invention belongs to the field of fungicides, and in particular relates to the application of bismuth trioxide as a fungicide. Background technique [0002] Commonly used antibacterial materials are divided into inorganic antibacterial agents, organic antibacterial agents, photocatalytic antibacterial agents, etc. Among them, organic antibacterial agents have the characteristics of fast sterilization speed and high antibacterial efficacy, but they have poor heat resistance, insufficient persistence, and are prone to drug resistance. Photocatalytic antibacterial materials have developed rapidly in recent years, but they mainly rely on ultraviolet light, and the light utilization rate is low. Inorganic antibacterial agents have the characteristics of good heat resistance, good stability, broad antibacterial spectrum, long validity period, low toxicity, and no drug resistance. They are the mainstream products in the current market. [0003] Among th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01N59/20A01P1/00C01G29/00
CPCA01N59/16A01N59/20C01G29/00
Inventor 孙占奎
Owner ZHONGKE YOUPIN (TIANJIN) TECH DEV CO LTD
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