Cellulose nanofiber hyperbranched modification method

A nanofiber and cellulose technology, applied in chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc., can solve the problems of low content of active functional groups, limited adsorption capacity, and no breakthrough in adsorption performance, and achieve high porosity, strong The effect of adsorption

Active Publication Date: 2015-07-08
SICHUAN UNIV
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Problems solved by technology

However, the adsorption performance of existing biomass adsorbents has not broken through
There are two main reasons. One is that the specific surface area of ​​most adsorption materials is small, and the adsorption mainly occurs on the surface of the material; the other is that the content of active functional groups that can strongly adsorb heavy metal ions on the adsorption materials is low, resulting in adsorption. limited ability

Method used

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  • Cellulose nanofiber hyperbranched modification method
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  • Cellulose nanofiber hyperbranched modification method

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Embodiment Construction

[0023] The specific embodiments of the present invention are described in conjunction with the embodiments.

[0024] The hyperbranched modification method of cellulose nanofiber comprises the following steps:

[0025] (1) Preparation of cellulose nanofibers CNFs

[0026] First, disperse the bamboo pulp cellulose into water with an emulsifier to obtain a 1% dispersion; then process it with an ultrasonic cell pulverizer; finally process it with a high-speed shear homogenizer to obtain cellulose nanofibers;

[0027] like figure 1 As shown in the scanning electron microscope photo of untreated bamboo pulp cellulose, it can be seen that the diameter of the bamboo pulp fiber is about 10 μm, and the surface is relatively rough. like figure 2 As shown, however, almost all bamboo fibers after ultrasonic crushing and high-speed shear homogenization have become nanofibers, and the diameters of the prepared CNFs are mainly distributed between 20-50nm, indicating that the ultrasonic an...

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Abstract

The invention relates to a preparation method of a biomass absorbent and specifically relates to a cellulose nanofiber hyperbranched modification method. According to the invention, cellulose nanofiber is prepared by combination of ultrasonication and high-speed shear homogenization; through hyperbranched chemical modification, dendritic PAMAM is grafted to the surface of CNFs; and with a freeze-drying method, CNFs-PAMAM is prepared into aerogel. As an absorbent, the aerogel has very small density and very high porosity, and has a macropore-micropore coexisting structural characteristic. Therefore, the absorption capacity of the absorbent for heavy metal ions in water is facilitated. The absorbent is also biodegradable. The preparation process is environment-friendly, highly efficient and simple.

Description

technical field [0001] The invention relates to a preparation method of a biomass adsorbent, in particular to a hyperbranched modification method of cellulose nanofibers. Background technique [0002] The key technology for removing hexavalent chromium in water by adsorption method is the development of adsorbents. The adsorbents currently used in industry are relatively expensive, have low adsorption capacity, and are difficult to regenerate. [0003] At present, the use of biomass adsorbents to remove heavy metal ions has become a research hotspot. However, there is no breakthrough in the adsorption performance of the existing biomass adsorbents. There are two main reasons. One is that the specific surface area of ​​most adsorption materials is small, and the adsorption mainly occurs on the surface of the material; the other is that the content of active functional groups that can strongly adsorb heavy metal ions on the adsorption materials is low, resulting in adsorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08J9/28C08J3/075C08L51/00C08F251/02C08F220/14B01J20/26B01J20/28B01J20/30
Inventor 张伟赵江琦卢灿辉
Owner SICHUAN UNIV
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