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Oxidation nanocellulose adsorbing material and preparation method thereof

A nanocellulose and adsorption material technology, which is applied in the field of oxidized nanocellulose adsorption material and its preparation, can solve the problems that the adsorption capacity of pure cellulose cannot be improved and the specific surface is low.

Active Publication Date: 2016-04-20
UNIV OF SCI & TECH OF CHINA
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  • Claims
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Problems solved by technology

However, on the one hand, the specific surface of pure cellulose is low; on the other hand, in the adsorption process, the adsorption capacity of pure cellulose has not been improved due to the lack of effective metal-binding sites on the surface.

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  • Oxidation nanocellulose adsorbing material and preparation method thereof
  • Oxidation nanocellulose adsorbing material and preparation method thereof
  • Oxidation nanocellulose adsorbing material and preparation method thereof

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[0029] The embodiment of the present invention discloses a preparation method of an oxidized nanocellulose adsorption material, comprising the following steps:

[0030] A), cleaning the cellulose-containing raw material after pretreatment;

[0031] B), under the catalysis of 2,2,6,6-tetramethylpiperidine-nitrogen-oxide and sodium bromide, the cellulose obtained in step A) is oxidized under the action of an oxidizing agent to obtain oxidized Nanocellulose; The oxidizing agent is sodium hypochlorite;

[0032] C), mixing the oxidized nanocellulose with an amino group-containing polymer organic solution, centrifuging, then mixing with a crosslinking agent, and reacting to obtain an oxidized nanocellulose adsorption material.

[0033] The cellulose in the present invention is first reacted by the TEMPO (2,2,6,6-tetramethylpiperidine-nitrogen-oxide)-NaBr-NaClO oxidation system to obtain network-like nanofibers with carboxyl groups on the surface prime, and then through deep grafti...

Embodiment 1

[0052] Pretreat 4g of refined cotton in 250mL of 1:1 (v / v) HCl solution at 80°C for 20 minutes, then wash to neutral. Add 400mL mixed solution containing 1.8mg / LTEMPO and 18mg / LNaBr into a 1L three-neck flask, add the pretreated cellulose, slowly add 200mL7% NaClO solution and stir vigorously, adjust the pH of the solution to 10, and turn on Ultrasound-assisted oxidation reaction, during the reaction process, maintain the pH of the solution between 10-10.2 by adding 0.4mol / L NaOH solution, after the oxidation reaction is carried out for 12 hours, add 200mL of methanol and stir vigorously for 1 hour to terminate the reaction, and let it stand Reaction product, remove the supernatant after layering, centrifuge the remaining mixture at 8000rpm to obtain a solid product, use a 2:1 (v / v) ethanol / water mixed solution to wash three times, freeze-dry the solid product and grind to obtain an oxidized nanometer cellulose. Add 2g of oxidized nanocellulose to 100mL methanol solution and ...

Embodiment 2

[0067]Pretreat 4g of refined cotton in 250mL of 1:1 (v / v) HCl solution at 80°C for 20 minutes, then wash to neutral. Add 400mL of a mixed solution containing 1.8mg / LTEMPO and 18mg / LNaBr into a 1L three-necked flask. After adding the pretreated cellulose to the above mixed solution, slowly add 200mL of 7% NaClO solution and stir vigorously to adjust the pH of the solution to 10 , and start the ultrasonic-assisted oxidation reaction. During the reaction process, maintain the pH of the solution between 10-10.2 by adding 0.4mol / L NaOH solution. After the oxidation reaction was carried out for 12 hours, add 200mL of methanol and stir vigorously for 1 hour to terminate the reaction , let the reaction product stand, remove the supernatant after layering, centrifuge the remaining mixture at 8000rpm to obtain a solid product, use 2:1 (v / v) ethanol / water mixed solution to wash three times, freeze-dry and grind the solid product , to obtain oxidized nanocellulose. Add 2g of oxidized nan...

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Abstract

The invention provides a preparation method of an oxidation nanocellulose adsorbing material. The preparation method comprises the following steps of conducting pretreatment and then cleaning cellulose; and under the catalytic action of 2, 2, 6, 6-tetramethyl piperidine-nitrogen-oxide and sodium bromide, conducting an oxidation reaction on obtain cellulose under the action of an oxidizing agent, so that oxidation nanocellulose is obtained, wherein sodium hypochlorite serves as the oxidizing agent; mixing the nanocellulose with an organic solution containing amino high molecules, then conducting centrifugation, then mixing the mixture with a cross-linking agent, and conducting a reaction, so that the oxidation nanocellulose adsorbing material is obtained. By means of the preparation method, the specific surface area of the cellulose is increased, the contactable performance of heavy metal pollutants and adsorbent is improved, the surface of the material can have a large number of adsorption functional groups, and heavy metal ions can be aggregated to the surface of the adsorbent from a sewage system through the complexation effect and the electrostatic effect. The invention further provides the oxidation nanocellulose adsorbing material.

Description

technical field [0001] The invention relates to the technical field of cellulose, in particular to an oxidized nano-cellulose adsorption material and a preparation method thereof. Background technique [0002] At this stage, the gradual development of industry in today's world has made the heavy metal pollutants in water and soil more and more serious. Traditional methods for removing heavy metal pollutants include chemical precipitation, ultrafiltration, flocculation, ion exchange, adsorption, reverse osmosis, and electrodialysis, among others. Among them, the adsorption method, which removes pollutants through the interaction between heavy metal ions and adsorbent binding sites, has good characteristics such as easy operation, high efficiency, and high stability, and is widely used in production practice. [0003] Cellulose is a material obtained through photosynthesis of plants in nature, and it has received extensive attention due to its regeneration. The adsorption fu...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30
CPCB01J20/24B01J20/267B01J2220/44B01J2220/4825
Inventor 盛国平张楠
Owner UNIV OF SCI & TECH OF CHINA
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