Amphoteric cellulose silk efficient adsorption material and preparation method and application thereof

A technology of amphoteric cellulose and adsorption materials, which is applied in the field of amphoteric cellulose silk high-efficiency adsorption materials and its preparation, and can solve the problems of inability to provide reaction sites, unsafe drinking standards, and limited introduction.

Active Publication Date: 2021-05-07
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently reported methods cannot efficiently remove both anion and cationic heavy metal ions in water due to the difficulty in preparing cellulose-based adsorbents with high density of both amino and carboxyl groups.
Let alone make it meet the safe drinking standard required by the state
[0004] In the traditional "step-by-step" grafting method, the hydroxyl groups of cellulose are covered by the graft layer, resulting in some hydroxyl groups of cellulose being unable to provide reaction sites for the next step of grafting, thus limiting the introduction of other functional groups

Method used

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  • Amphoteric cellulose silk efficient adsorption material and preparation method and application thereof
  • Amphoteric cellulose silk efficient adsorption material and preparation method and application thereof
  • Amphoteric cellulose silk efficient adsorption material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Preparation of amphoteric cellulose filament high-efficiency adsorption material

[0030](1) Add carboxylated nanocellulose to a polyethyleneimine solution with a molecular weight of 75000 mass fraction of 10%, the mass ratio of carboxylated nanocellulose and polyethyleneimine is 1:5, and stir until carboxylated nanofibers The cellulose is completely and uniformly dispersed, and a blend of carboxylated nanocellulose and polyethyleneimine is obtained. Graphene oxide was dispersed in water and subjected to ultrasonic activation treatment. The ultrasonic power was 100W, the ultrasonic time was 60min, and the concentration of the graphene oxide dispersion was 2.5mg / L. The blend of carboxylated nanocellulose and polyethyleneimine and the graphene oxide dispersion liquid after ultrasonic activation treatment were dropped on the polystyrene plate respectively, and when the interface of the two droplets was in contact, the blend It is drawn into filamentous fibers w...

Embodiment 2

[0032] Example 2: Preparation of amphoteric cellulose filament high-efficiency adsorption material

[0033] (1) Add carboxylated nanocellulose to the polyethyleneimine solution with a molecular weight of 75000 mass fraction of 2%, the mass ratio of carboxylated nanocellulose and polyethyleneimine is 1:7.5, and stir until carboxylated nanofibers The cellulose is completely and uniformly dispersed, and a blend of carboxylated nanocellulose and polyethyleneimine is obtained. Graphene oxide was dispersed in water and subjected to ultrasonic activation treatment. The ultrasonic power was 500 W, the ultrasonic time was 90 min, and the concentration of the graphene oxide dispersion was 7.5 mg / L. The blend of carboxylated nanocellulose and polyethyleneimine and the dispersion of graphene oxide were dropped on the polystyrene plate, and when the interface of the two droplets was in contact, the blend and graphene oxide were pulled into a Filamentous fibers, the two are combined into f...

Embodiment 3

[0035] Example 3: Preparation of amphoteric cellulose filament high-efficiency adsorption material

[0036] (1) Add carboxylated nanocellulose to a polyethyleneimine solution with a molecular weight of 75000 mass fraction of 20%, the mass ratio of carboxylated nanocellulose and polyethyleneimine is 1:10, and stir until carboxylated nanofibers The cellulose is completely and uniformly dispersed, and a blend of carboxylated nanocellulose and polyethyleneimine is obtained. Graphene oxide was dispersed in water and subjected to ultrasonic activation treatment. The ultrasonic power was 1000 W, the ultrasonic time was 120 min, and the concentration of the graphene oxide dispersion was 10 mg / L. The blend of carboxylated nanocellulose and polyethyleneimine and the graphene oxide dispersion were dropped on the polystyrene plate, and when the interface of the two droplets was in contact, the blend was combined with graphene oxide to form a Filamentous fibers, the two are combined into ...

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Abstract

The invention discloses an amphoteric cellulose silk efficient adsorption material and a preparation method and application thereof, the material is obtained by using carboxylated nano cellulose as a matrix and graphene oxide and polyethyleneimine as functional reagents, adopting a spider-imitating spinning electrostatic combination method and adopting a glutaraldehyde micro-crosslinking mode. The material has good performance when being applied to the field of low-concentration heavy metal adsorption: low-concentration (1000ppb) anionic heavy metal ions Cr (VI and low-concentration (1000ppb) cationic heavy metal ions Cd (II), Cu (II), Zn (II) and Pb (II) can be efficiently removed at the same time, the removal rate is greater than 99.99%, the concentration of the removed heavy metal ions reaches the national drinking water standard, the regeneration stability is good, after 10 times of regeneration, the regeneration rate is still greater than 95%.

Description

technical field [0001] The invention relates to the field of heavy metal ion adsorption, in particular to an amphoteric cellulose filament high-efficiency adsorption material and its preparation method and application. Background technique [0002] With the development of mining and metallurgical industries, heavy metal ions enter human and animal bodies through the water cycle and food chain, posing a great threat. Using chemical precipitation, biological treatment, membrane separation, ion exchange and adsorption of high-concentration heavy metal ion wastewater can be effectively treated by chemical precipitation to achieve low concentration. However, to efficiently remove low-concentration heavy metal ions often requires more human and financial resources. Adsorption is considered as a promising method because of its strong operational adaptability and low treatment cost, and the key to adsorption technology is the adsorbent. Considering economic benefit and removal eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/26B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/28038B01J20/267B01J20/3085B01J20/28007C02F1/285B01J2220/46C02F2101/20C02F2101/22
Inventor 朱红祥周航何辉薛飞熊建华黄闻宇
Owner GUANGXI UNIV
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