Unlock instant, AI-driven research and patent intelligence for your innovation.

Application of a method of grafting amino acids on nanocellulose in ultrafiltration membranes

A nanocellulose and amino acid technology, applied in the field of nanocellulose, can solve the problems of impossibility, waste of energy, and limited application range, and achieve the effects of strong anti-pollution ability, simple method and easy operation.

Active Publication Date: 2018-12-28
BEIJING INSTITUTE OF TECHNOLOGYGY +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of nanocellulose usually has methods such as mechanical or acid degradation. The products obtained by mechanical methods are usually impure and contain impurities such as microcellulose. It is often impossible to obtain a single fiber, and a large amount of waste will be wasted in the production process. energy of
Or treat the cellulose with a strong acid, the acid will degrade the length and diameter of the molecular chain, damage the structure of the microfiber, it is very unfavorable to the nanocellulose, the application range is not wide, and the effect is not good

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Application of a method of grafting amino acids on nanocellulose in ultrafiltration membranes
  • Application of a method of grafting amino acids on nanocellulose in ultrafiltration membranes
  • Application of a method of grafting amino acids on nanocellulose in ultrafiltration membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for grafting amino acids onto nanocellulose, carried out as follows: 20mL of TEMPO oxidized nanocellulose suspension with a solid content of 0.07% is mixed with EDAC of 100mM and 5mL of NHS with a concentration of 50mM to adjust the activation pH of the solution system to 5.5, stirred and activated at room temperature for 0.5h; add enough concentration to be 5mg·mL -1 Lysine aqueous solution, adjust the pH of the reaction solution system to 8.0, continue to stir at room temperature, after fully reacting for 12 hours, dialyze the solution for 72 hours, completely remove unreacted amino acids, condensation agents and activators, and finally obtain grafted lysine TEMPO oxidized nanocellulose suspension.

Embodiment 2

[0024] A method for grafting amino acids onto nanocellulose, carried out as follows: 20 mL of TEMPO oxidized nano-cellulose suspension with a solid content of 0.09% is mixed with EDAC of 100 mM and 5 mL of NHS with a concentration of 50 mM to adjust the activation pH of the solution system to 5.5, stirred and activated at room temperature for 1.5h; add enough concentration to be 8mg·mL -1 Lysine aqueous solution, adjust the pH of the reaction solution system to 7.0, continue to stir at room temperature, after fully reacting for 12 hours, dialyze the solution for 72 hours, completely remove unreacted amino acids, condensation agents and activators, and finally obtain grafted lysine TEMPO oxidized nanocellulose suspension.

Embodiment 3

[0026] A method for grafting amino acids onto nanocellulose, carried out as follows: 20mL of TEMPO oxidized nanocellulose suspension with a solid content of 0.10% is mixed with EDAC of 100mM and 5mL of NHS with a concentration of 50mM to adjust the activation The pH of the solution system was brought to 6.0, stirred and activated at room temperature for 2 hours; the concentration was 10mg·mL -1 Lysine aqueous solution, adjust the pH of the reaction solution system to 8.0, continue to stir at room temperature, after fully reacting for 12 hours, dialyze the solution for 72 hours, completely remove unreacted amino acids, condensation agents and activators, and finally obtain grafted lysine TEMPO oxidized nanocellulose suspension.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for grafting nano-crystalline cellulose with amino acid. The method comprises the following steps: adding a TEMPO oxidized nano-crystalline cellulose suspension into a solution containing a condensating agent and an activator to carry out activation; adding an amino acid solution, continuously stirring at room temperature, fully reacting, and dialyzing the solution to thoroughly eliminate unreacted water-soluble micromolecules so as to obtain an amino acid-grafting TEMPO oxidized nano-crystalline cellulose suspension. The general chemical formula of the amino acid is NH2-R-CH(NH2)-COOH, wherein R is alkyl chain. The method is simple and is convenient to operate. After grafting of amino acid, nano-crystalline cellulose is not aggregated; the nanostructure of TEMPO oxidized nanofiber is not destroyed; and the morphology and dimension are not changed. In addition, the application range is wider, and the effect is better. If the grafted oxidized nanofiber is used as a raw material for an ultrafiltration membrane, the prepared ultrafiltration membrane has high water flux and stronger anti-pollution capacity.

Description

technical field [0001] The invention belongs to the technical field of nanocellulose, and in particular relates to a method for grafting amino acids to nanocellulose for ultrafiltration membranes. Background technique [0002] Today, due to the depletion of petroleum resources, natural biological and nanomaterials have aroused more and more interest of researchers. As the most abundant natural polymer material in the world, cellulose is a very good biopolymer with other The incomparable advantages of materials are inexhaustible and inexhaustible, and they are renewable resources. Natural cellulose is composed of microfibers, which are formed by biosynthesis and self-assembly, with a diameter of 2-20nm and a length of about 100nm to several microns. The microfibers are tightly combined with each other through multiple hydrogen bonds. It is often very difficult to break this hydrogen bond. It is precisely because of the strong hydrogen bonding force between the microfibers t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/06
CPCC08B15/06
Inventor 张大伦秦笃建邵自强张茜荃王亚龙刘川渟张仁旭彭欢
Owner BEIJING INSTITUTE OF TECHNOLOGYGY