A kind of antibacterial oil-water separation nano-airgel composite material and its preparation method and application

A nano-aerogel and composite material technology is applied in the field of nano-aerogel composite materials for antibacterial oil-water separation and its preparation, which can solve the problems of loss of adsorption capacity, collapse of structure, and limited application of aerogels, and achieve a simple and convenient operation method. , The effect of short reaction time and few kinds of raw materials

Active Publication Date: 2020-08-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, nanocrystalline cellulose itself has no bactericidal effect, and even because of the porous properties of the airgel adsorption material prepared by it, it provides a surface for bacteria to attach to, making it easier for bacteria to grow and reproduce under humid conditions
In addition, the strong hydrophilic nature of the cellulose skeleton will cause the structure of the adsorbent to collapse when it comes into contact with water, making the airgel unable to maintain its original shape in the water environment, thus losing its adsorption capacity, which limits the adsorption of airgel in wastewater. Aspects of application

Method used

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  • A kind of antibacterial oil-water separation nano-airgel composite material and its preparation method and application
  • A kind of antibacterial oil-water separation nano-airgel composite material and its preparation method and application
  • A kind of antibacterial oil-water separation nano-airgel composite material and its preparation method and application

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Effect test

Embodiment 1

[0033] A nano-airgel composite material for antibacterial oil-water separation, the preparation method of which comprises the steps of:

[0034] (1) Add 1 g of nanocrystalline cellulose to 100 g of deionized aqueous solution, and ultrasonically disperse it into a homogeneous suspension with a mass fraction of 1 wt%, as Phase A;

[0035] (2) Dissolve 2g of haloamine antibacterial agent precursor cyanuric chloride in 10ml of ethanol as phase B;

[0036] (3) At 0-5°C, use sodium bicarbonate solution to adjust the pH of Phase A to 8, slowly add Phase B to Phase A, keep stirring, and react for 1 hour. Centrifuge for 10 minutes, wash the obtained precipitate three times with deionized water, disperse the product in water, dialyze to neutrality with 8000 molecular weight dialysis bag, and then concentrate to a concentration of 2wt%, as phase C;

[0037] (4) Take 50 g of phase C, adjust the pH to 6 with sulfuric acid solution, raise the temperature to 60° C., slowly add 0.5 g of silo...

Embodiment 2

[0039] A nano-airgel composite material for antibacterial oil-water separation, the preparation method of which comprises the steps of:

[0040] (1) Add 3 g of nanocrystalline cellulose to 100 g of deionized aqueous solution, and ultrasonically disperse it into a homogeneous suspension with a mass fraction of 3 wt%, as phase A;

[0041] (2) Dissolve 4.5g of haloamine antibacterial agent precursor cyanuric chloride in 22.5ml of acetone, as phase B;

[0042] (3) At 0-5°C, use sodium carbonate solution to adjust the pH of Phase A to 9, slowly add Phase B to Phase A, keep stirring, and react for 2 hours. After the reaction, centrifuge the obtained solution at 10000rpm For 10 minutes, the obtained precipitate was washed three times with deionized water, and after the product was dispersed in water, it was dialyzed to neutrality with an 8000 molecular weight dialysis bag, and then concentrated to a concentration of 4 wt%, as phase C;

[0043] (4) Take 50 g of phase C, adjust the pH...

Embodiment 3

[0045] A nano-airgel composite material for antibacterial oil-water separation, the preparation method of which comprises the steps of:

[0046] (1) Add 6 g of nanocrystalline cellulose into 100 g of deionized aqueous solution, and ultrasonically disperse it into a homogeneous suspension with a mass fraction of 6 wt%, as phase A;

[0047] (2) Dissolve 6g of halamine antibacterial agent precursor cyanuric chloride in 10ml of ethanol as phase B;

[0048] (3) At 0-5°C, adjust the pH of phase A to 10 with sodium hydroxide solution, slowly add phase B into phase A dropwise, keep stirring, and react for 3.5 hours. After the reaction, the resulting solution was centrifuged at 10,000 rpm for 10 min, and the resulting precipitate was washed three times with deionized water. After the product was dispersed in water, it was dialyzed to neutrality with an 8,000 molecular weight dialysis bag, and then concentrated to a concentration of 6 wt%. as phase C;

[0049] (4) Take 50g of phase C, a...

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Abstract

The invention discloses an antibacterial oil-water separation nanometer aerogel composite. A preparation method of the composite comprises the following steps: (1) dispersing nanocrystalline celluloseinto deionized water to prepare a phase A; (2) dissolving cyanuric chloride into an organic solvent to prepare a phase B; (3) slowly and dropwise adding the phase B into the phase A, carrying out a reaction under a mechanical stirring condition, continuously and dropwise adding an alkaline solution to keep the pH value constant, ending the reaction to prepare an antibacterial nanocrystalline cellulose suspension, and then, carrying out concentration to prepare a phase C; and (4) adding a siloxane compound into the phase C to carry out a reaction, ending the reaction, standing the reaction solution, and carrying out freeze-drying and chlorinating to prepare the antibacterial oil-water separation nanometer aerogel composite. The composite disclosed by the invention not only has an antibacterial function, but also has a selective oil-water separation function so as to have very important significance.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a nano airgel composite material for antibacterial oil-water separation and its preparation method and application. Background technique [0002] With rapid industrial development and current population growth, water resources are becoming scarce. Among them, oily wastewater is one of the problems. Wastewater also includes various toxic substances and various pathogens such as Escherichia coli that are extremely harmful to humans. The discharge of untreated oily wastewater into the environment creates serious ecological problems. In this context, researchers are working on the development of antimicrobial and adsorbent materials. [0003] As a natural material, nanocrystalline cellulose has become the focus of research work due to its abundant sources, high crystallinity, high strength, good biocompatibility, degradability and regeneration under natural conditions....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B01J20/24B01J20/30B01J20/28C02F1/28C02F1/40C02F1/50A01N43/66A01P3/00A01P1/00C02F101/30
Inventor 任学宏张艳范冰杰吕长辉李霞刘颖
Owner JIANGNAN UNIV
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