Biochar-chitosan compound as well as preparation method and application thereof

A technology of chitosan and biochar, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problem of unsatisfactory adsorption of azo dye-Congo red, high preparation cost, and poor stability of chitosan To achieve the effect of improving adsorption decolorization efficiency, increasing surface area, and strong adsorption capacity

Inactive Publication Date: 2020-03-27
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a biochar-chitosan composite and its preparation method and application, aiming to solve the problem of poor stability of chitosan, high preparation cost and the problem of azo dye-Congo The problem that the adsorption effect of red is not ideal

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  • Biochar-chitosan compound as well as preparation method and application thereof
  • Biochar-chitosan compound as well as preparation method and application thereof
  • Biochar-chitosan compound as well as preparation method and application thereof

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preparation example Construction

[0027] see figure 1 , figure 1 For the present invention discloses a flow chart of a preferred embodiment of a biochar-chitosan composite preparation method, as shown in the figure, the steps include:

[0028] S10, mixing chitosan, acid and biochar to obtain a reaction mixture solution; the mass concentration of chitosan in the reaction mixture solution is 2%-4%;

[0029] Biochar is a solid substance with high carbon content obtained by pyrolysis of carbon-containing organic matter under anaerobic or low-oxygen conditions. It is highly aromatized and chemically stable. Biochar has a huge specific surface area and numerous surface functional groups. It has the characteristics of rich pores, high stability, strong adsorption to dyes, rich resources, green and sustainable development. At the same time, because biochar has the characteristics of low price, high efficiency and little secondary pollution to the environment, it can reduce the adverse effects of organic pollutants a...

Embodiment 1

[0049] Weigh 2.0 g of chitosan powder, dissolve the chitosan with 100 mL of 2% acetic acid solution, stir for 30 minutes, and set aside. Add 0.5 g of biochar microparticles into the chitosan solution, and obtain a stable biochar-chitosan mixed solution system after the continuous vibration of the ultrasonic instrument for 30 minutes to make the system uniform. Add the above-mentioned chitosan solution dropwise into 200mL of alkaline precipitation medium (2mol / L NaOH and absolute ethanol ratio 4:1 mixture) through a syringe equipped with a No. 5 needle to prepare porous biochar-shell Polycane complex. Separate the complex by filtration, wash until neutral, add 80mL formaldehyde solution for cross-linking, wait for the chitosan complex to be cross-linked for 20 minutes, leave it sealed at room temperature for 12 hours, and then use deionized Wash with water until neutral to obtain the composite sample ③.

Embodiment 2

[0051] Weigh 2.5 g of chitosan powder, dissolve the chitosan with 100 mL of 2% acetic acid solution, stir for 30 minutes, and set aside. Add 0.5 g of biochar microparticles into the chitosan solution, and obtain a stable biochar-chitosan mixed solution system after the continuous vibration of the ultrasonic instrument for 30 minutes to make the system uniform. Add the above-mentioned chitosan solution dropwise into 200mL of alkaline precipitation medium (2mol / L NaOH and absolute ethanol ratio 4:1 mixture) through a syringe equipped with a No. 5 needle to prepare porous biochar-shell Polycane complex. Separate the complex by filtration, wash until neutral, add 80mL formaldehyde solution for cross-linking, wait for the chitosan complex to be cross-linked for 20 minutes, leave it sealed at room temperature for 12 hours, and then use deionized Wash with water until neutral to obtain the composite sample ④.

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Abstract

The invention relates to a biochar-chitosan compound as well as a preparation method and application thereof, and the method comprises the following steps: mixing chitosan, acids and biochar to obtaina reaction mixed solution; wherein the mass concentration of chitosan in the reaction mixed solution is 2-4%; dropwise adding the reaction mixed solution into an alkaline precipitation solution, andfiltering to obtain a crude product; and washing the crude product, adding a cross-linking solution, and washing to be neutral to obtain the biochar-chitosan compound. According to the biochar-chitosan compound obtained by the preparation method disclosed by the invention, after biochar microparticles are added into a loose and porous chitosan microsphere structure; the surface area of the microspheres is obviously increased, the adsorption and decolorization efficiency of dye wastewater is further improved, the problem that mother liquor is difficult to separate can be avoided, so that second-stage pollution is avoided, and the biochar-chitosan compound shows excellent adsorption performance after adsorbing an azo dye Congo red reagent solution.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a biochar-chitosan composite and a preparation method and application thereof. Background technique [0002] Sewage treatment is a major problem in modern industry, especially the treatment of colored sewage. Among them, the pollutants in colored sewage - azo dyes (such as azo Congo red) are a kind of dye-derived pollutants. Under special conditions, azo dyes can decompose and produce more than 20 kinds of aromatic amine carcinogens. After activation Changing the DNA structure of the human body can easily cause human disease and induce cancer. In the process of production and use, azo dyes are discharged into the natural environment without treatment, which may have serious impact on the health of those exposed. However, because of its stable chemical properties and complex components, azo dye wastewater is recognized as a relatively difficult organic wastewater to treat. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24C02F1/28C02F101/30
CPCB01J20/20B01J20/24C02F1/283C02F1/286C02F2101/308
Inventor 周子凡陆信贤涂国富
Owner FOSHAN UNIVERSITY
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