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Chitosan/anhydride modified biological carbon composite and preparation method and application thereof

A technology for composite materials and acid anhydride modification, which is applied to chemical instruments and methods, water pollutants, and other chemical processes to achieve rapid preparation, low price, and high removal efficiency

Inactive Publication Date: 2017-06-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to develop a low-cost, high-efficiency biochar composite material modified by chitosan and pyromellitic anhydride that can be used for adsorption and treatment of heavy metal pollutants in view of the technical problems existing in the prior art

Method used

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  • Chitosan/anhydride modified biological carbon composite and preparation method and application thereof
  • Chitosan/anhydride modified biological carbon composite and preparation method and application thereof
  • Chitosan/anhydride modified biological carbon composite and preparation method and application thereof

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Embodiment 1

[0023] A kind of preparation of chitosan / acid anhydride modified biochar composite material of the present invention, biochar raw material is selected straw, and concrete preparation method is as follows:

[0024] Wash the straw with deionized water, then dry it at 80°C for 24 hours, put the dried biomass into a tube furnace for pyrolysis and firing, keep the quartz tube of the tube furnace sealed during the pyrolysis process, and at the same time Into the tube at a flow rate of 400mL / min into the N 2 , in order to maintain the anaerobic conditions of the whole pyrolysis process, the heating program of the tube furnace is set as: heating from room temperature to 450°C at a heating rate of 5°C / min, and continuing pyrolysis at this temperature for 2 hours, then start the natural cooling process, and keep N during the cooling process 2 Continue to pass through at the same flow rate, cool to room temperature and take out to obtain the original biochar, and pass the biochar throug...

Embodiment 2

[0027] Chitosan / acid anhydride modified biochar composite material of the present invention treats heavy metals in waste water, comprises the following steps:

[0028] Get 50mL of the heavy metal solution whose initial concentration is 100mg / L, add the chitosan / acid anhydride modified biochar composite material that embodiment 1 makes, the consumption of this adsorbent is 0.05g, carry out oscillation adsorption at 25 ℃ of water bath constant temperature oscillators After 24 hours, the sorbent was separated from the waste water by filtration, and the content of the unadsorbed heavy metal in the waste water was measured with an atomic absorption instrument. The calculated adsorption results are shown in Table 1:

[0029] Table 1: Adsorption capacity data of adsorbents under different initial concentrations of crystal violet

[0030]

[0031]

[0032] It can be seen from Table 1 that under the condition of initial concentration of 100mg / L, the adsorption capacity of the ads...

Embodiment 3

[0034] Chitosan / acid anhydride modified biochar composite material of the present invention handles the copper ion in the waste water under different pH conditions, comprises the following steps:

[0035] Get 50mL initial concentration and be the copper-containing solution of 100mg / L, add the chitosan / acid anhydride modified biochar composite material that embodiment 1 makes, adjust pH to be 2.0~6.0, the consumption of this adsorbent is 0.05g, at 25 ℃ water bath constant temperature oscillator for oscillating adsorption reaction. After 24 hours, the adsorbent was separated from the wastewater by filtration, and the content of unadsorbed copper ions in the wastewater was measured with an atomic absorption instrument. The calculated adsorption results are shown in Table 2. :

[0036] Table 2: Adsorption data of adsorbents for copper ions under different pH conditions

[0037] pH 2.0 3.0 4.0 5.0 6.0 Adsorption capacity (mg / g) 13.0 45.3 69.0 70.2 70.3 ...

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Abstract

The invention relates to a chitosan / anhydride modified biological carbon composite and a preparation method and application of the chitosan / anhydride modified biological carbon composite. The composite takes biological carbon as a matrix, and the surface of the matrix is modified through chitosan and anhydride. The preparation method comprises the following specific steps: firstly pyrolyzing biomass powder to obtain the original biological carbon, then preparing the chitosan modified biological carbon composite, and finally obtaining the product through the reaction of pyromellitic dianhydride and the chitosan on the biological carbon composite. The chitosan / anhydride modified biological carbon composite has the characteristics of rich raw material, low manufacturing cost, more adsorption sites, high adsorbing capacity and no secondary pollution, and the removal efficiency of a heavy metal is relatively high.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and new water treatment technologies, and in particular relates to a biochar composite material modified with chitosan and pyromellitic anhydride, a preparation method and application thereof. Background technique [0002] The discharge of heavy metals to water bodies is extremely harmful to the environmental ecosystem. With the rapid development of industry, a large amount of heavy metal pollutants are discharged into water bodies. These heavy metal pollutants are non-degradable and have toxic effects on humans and animals. Therefore, it is necessary to explore a cost-effective technology for heavy metal treatment. General heavy metal wastewater treatment methods include adsorption, chemical precipitation, ion exchange, reverse osmosis, etc. Among them, adsorption is a simple operation, low cost, and relatively efficient technology for treating pollutants, which has been applie...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/20C02F1/286C02F2101/20
Inventor 邓佳钦刘云国曾光明刘少博谭小飞宋彪黄斌艳闫芝丽华权
Owner HUNAN UNIV
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