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A kind of nano magnesium oxide inorganic antibacterial agent and preparation method thereof

An inorganic antibacterial agent and nano-magnesium oxide technology, applied in the field of antibacterial materials, can solve the problems of limited application field and low antibacterial activity of nano-magnesium oxide inorganic antibacterial agent, and achieve the effects of improving antibacterial performance, low cost and simple operation

Active Publication Date: 2021-10-22
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the above problems, and researches and designs a nano-magnesium oxide inorganic antibacterial agent and its preparation method to solve the shortcomings of the nano-magnesia inorganic antibacterial agent's low antibacterial activity and limited application fields.

Method used

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  • A kind of nano magnesium oxide inorganic antibacterial agent and preparation method thereof
  • A kind of nano magnesium oxide inorganic antibacterial agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 9.25mmol of MgCl 2 ·6H 2 O, 0.75mmol of LiNO 3 (the molar proportion is 7.5%) and 0.3mmol of EDTA-2Na were dissolved in 70mL of deionized water, and a clear solution was obtained after stirring; 10mL of NH 3 ·H 2 O was added dropwise to the above clear liquid and stirred vigorously for 20 min, put into the reaction kettle and heated at 180°C for 24 h, and cooled to room temperature after taking it out. After centrifuging the solution and precipitate in the reaction kettle to remove the supernatant, washing and centrifuging with deionized water and absolute ethanol respectively, vacuum-drying the white precipitate to obtain a precursor. Finally, the precursor was calcined at 750 °C for 4 h in nitrogen, and the prepared antibacterial agent was denoted as a. Antibacterial agent a with a concentration of 100 μg / mL can efficiently inactivate 10 8 Escherichia coli with cfu / mL has an antibacterial rate of 98.5%. Antibacterial agent a with a concentration of 450 μg / mL can...

Embodiment 2

[0030] 9.50mmol of MgCl 2 ·6H 2 O, 0.5mmol LiNO 3 (5.0% by molar ratio) and 0.3mmol of EDTA-2Na were dissolved in 70mL of deionized water, and after stirring, a clear solution was obtained; 10mL of NH 3 ·H 2 O was added dropwise to the above clear liquid and stirred vigorously for 20 min, put into the reaction kettle and heated at 180°C for 24 h, and cooled to room temperature after taking it out. After centrifuging the solution and precipitate in the reaction kettle to remove the supernatant, washing and centrifuging with deionized water and absolute ethanol respectively, vacuum-drying the white precipitate to obtain a precursor. Finally, the precursor was calcined at 750 °C for 4 h in nitrogen, and the prepared antibacterial agent was denoted as b. Antibacterial agent b at a concentration of 100 μg / mL can efficiently inactivate 10 8 Escherichia coli with cfu / mL has an antibacterial rate of 92.5%.

Embodiment 3

[0032] 9.25mmol of MgCl 2 ·6H 2 O, 0.75mmol of LiNO 3 (the molar proportion is 7.5%) and 0.3mmol of EDTA-2Na were dissolved in 70mL of deionized water, and a clear solution was obtained after stirring; 10mL of NH 3 ·H 2 O was added dropwise to the above clear liquid and stirred vigorously for 20 min, put into the reaction kettle and heated at 180°C for 24 h, and cooled to room temperature after taking it out. After centrifuging the solution and precipitate in the reaction kettle to remove the supernatant, washing and centrifuging with deionized water and absolute ethanol respectively, vacuum-drying the white precipitate to obtain a precursor. Finally, the precursor was calcined at 650 °C for 4 h in nitrogen, and the prepared antibacterial agent was denoted as c. Antibacterial agent c at a concentration of 100 μg / mL can efficiently inactivate 10 8Escherichia coli with cfu / mL has an antibacterial rate of 96.2%.

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Abstract

The invention discloses a nano-magnesia inorganic antibacterial agent and a preparation method thereof. The molar doping amount of lithium in the nano-magnesia inorganic antibacterial agent is 0.5-10%. The preparation method comprises the following steps: S1, adding lithium salt , magnesium salt, and complexing agent are dissolved in deionized water, and the molar ratio of lithium salt and magnesium salt is (0.5-10): (90-99.5), and a clear solution is obtained after stirring; S2, adding the precipitating agent to step S1 gained Stirring in the clarified solution; S3, heating the mixture of step S2; S4, taking out the product of step S3, cooling to room temperature, washing, and vacuum drying to obtain a precursor; S5, calcining the precursor of step S4 in an oxygen-free atmosphere to obtain nano-oxidized Magnesium inorganic antimicrobial agent. The preparation method provided by the invention has low cost, simple operation, and is suitable for industrial production. The prepared antibacterial agent not only has high-efficiency antibacterial activity, but also does not involve heavy metal pollution, has little safety risk to human body, and can be widely used in the field of health and safety.

Description

technical field [0001] The invention belongs to the field of antibacterial materials, and in particular relates to a nano-sized magnesium oxide inorganic antibacterial agent and a preparation method thereof. Background technique [0002] The proliferation, variation and spread of harmful microorganisms have seriously affected human health and the public health environment. For example, there are many outbreaks caused by pathogenic Escherichia coli at present. If the drinking water source is contaminated by enterohaemorrhagic Escherichia coli, it will cause diarrhea, fever, hemorrhagic enteritis, and seriously endanger human health. Therefore, it is necessary to continuously develop highly efficient antibacterial materials in order to inhibit the reproduction of harmful bacteria and reduce the spread of epidemic diseases. [0003] Antibacterial materials are generally divided into natural antibacterial agents, organic antibacterial agents and inorganic antibacterial agents a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N59/06A01P1/00C01F5/02C01F5/06C01F5/08B82Y40/00
CPCA01N59/06B82Y40/00C01F5/02C01F5/06C01F5/08
Inventor 赵娇朱益民李小艺杨雁唐晓佳
Owner DALIAN MARITIME UNIVERSITY
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