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Chitosan/nano-TiO2 composite material and preparation method and application thereof

A composite material, chitosan technology, applied in the fields of botanical equipment and methods, applications, textiles and papermaking, etc., can solve the problems of undisclosed bacteria and other microorganisms inhibiting effect, changing fiber strength, large amount of raw materials, etc., to achieve structural The effect of stability, enhanced antibacterial activity and appropriate degree of compounding of raw materials

Active Publication Date: 2014-08-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chitosan and Nano TiO 2 They have their own unique excellent characteristics in terms of antibacterial and antibacterial, so there are more and more researches and applications on the two, but there are still shortcomings when the two are used alone: ​​when chitosan is added to fabrics as an antibacterial agent, its particles Wrapped in the fiber core, sometimes it will change the strength, tension, elasticity and other properties of the original fiber, and even make the clothes sticky and discolored
The preparation method is simple, the raw material is cheap, and the source is abundant. TiO 2 Evenly distributed in the composite material with nanometer size, but there are some shortcomings: (1) There are many steps, and colloidal TiO needs to be prepared 2 ; And prepare colloidal TiO 2 Concentrated nitric acid or concentrated sulfuric acid is used in the process, which is not safe; (2) chitosan / TiO 2 The mass percentage of chitosan in the mixed solution is 1-10%, TiO 2 The mass percentage is 0.5-20%, and the amount of raw materials is relatively large; (3) the prepared composite material has a good inhibitory effect on fungi, but the inhibitory effect on other microorganisms such as bacteria is not disclosed

Method used

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  • Chitosan/nano-TiO2 composite material and preparation method and application thereof
  • Chitosan/nano-TiO2 composite material and preparation method and application thereof
  • Chitosan/nano-TiO2 composite material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1 prepares chitosan solution

[0039] Dissolve chitosan powder with a deacetylation degree of 85% in 1% acetic acid aqueous solution by volume to prepare a solution with a chitosan concentration of 10 mg / ml; adjust the pH to 6.0 with NaOH, and shake at room temperature for 24 hours at 160 rpm ; Sterilize in an autoclave at 121°C for 20 minutes, store at 4°C until use.

Embodiment 2

[0040] Embodiment 2 chitosan / nano TiO 2 Composite formulation

[0041] Take an appropriate amount of chitosan solution and nano-TiO 2 The powders were mixed according to the addition ratio in Table 1, and ultrasonically dispersed for 1 min to make TiO 2 The powder is completely dispersed in the chitosan solution and formulated as chitosan / nano-TiO 2 of emulsion. Move the emulsion to an autoclave, seal it, put it in an oven, react at 160°C-180°C for 2 hours, and then put it in a 4°C refrigerator for use.

[0042] Table 1 Chitosan / nano-TiO with different concentrations 2 Composite formulation

[0043]

[0044] Note: The concentration of each raw material is the concentration of the raw material in the emulsion.

Embodiment 3

[0045] Activation and cultivation of embodiment 3Xoo

[0046] Activate the Xoo strain stored at -70°C on NA (beef extract 1g, peptone 5g, yeast extract 5g, sodium chloride 5g, sucrose 10g, agar 20g, water 1000ml; pH 6.8-7.0) plate, and incubator Put it in the medium for 24-48h, check the purity of the bacteria, and use a sterilized transfer loop to pick up pure cultured bacteria with the same colony shape on a sterile ultra-clean bench, streak them on a new NA plate, and culture for 24 hours. Pick a single colony and inoculate it into LB liquid medium, shake and culture it in a shaker at 28°C and 160r / min for 24 hours to make a seed liquid, so that the concentration of bacteria in the seed liquid is 10 9 CFU / ml.

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Abstract

The invention discloses a chitosan / nano-TiO2 composite material and a preparation method and application thereof. The preparation method comprises the following steps that a chitosan solution is mixed with nano-TiO2 powder, the chitosan solution and the nano-TiO2 powder are dispersed by ultrasonic waves and reacted at a temperature of 160-180 DEG C for 1-2h to obtain the chitosan / nano-TiO2 composite material, wherein the concentration of the chitosan solution is 0.05 to 0.2 g / L, and the addition amount of the nano-TiO2 powder is 0.1 to 1.0g / L. The preparation method provided by the invention is simple to operate and good in safety, and nano-TiO2 can be uniformly dispersed in chitosan. The chitosan / nano-TiO2 composite material prepared by the method has a stable structure, better mechanical properties and processing properties, and can be used for preparing a fiber material; and the composite material can effectively decompose exopolysaccharides of rice bacterial blight pathogens, has antibacterial activity against the rice bacterial blight pathogens, and high photocatalytic efficiency, and is used for rice cultivation to effectively prevent and treat the rice bacterial blight.

Description

technical field [0001] The invention relates to the technical field of antibacterial composite materials, in particular to a chitosan / nano-TiO 2 Composite materials and their preparation methods and applications. Background technique [0002] Chitosan is the product of chitin after deacetylation treatment. Chitin with a degree of deacetylation greater than 55% is usually called chitosan. Its scientific name is polyglucosamine, and its chemical name is (1,4)-2. -Amino-2-deoxy-β-D-glucose is widely found in the shells of shrimps, crabs and other animals and in the cell walls of algae and fungi. Chitosan has good biocompatibility, biodegradability and no toxic side effects, and its molecule contains -OH and -NH 2 -Active group, easy to react with various organic substances, currently widely used in industry, agriculture, medicine, chemical industry, environmental protection and water treatment and other fields. [0003] Chitosan is a natural substance with a wide antibacteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08K3/22A01N59/16A01P1/00A01G13/00D01F9/00D01F1/10
Inventor 李斌周青单长林邱慧谢关林
Owner ZHEJIANG UNIV
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