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A kind of biomass smart fiber-based amphoteric multifunctional adsorption material and its preparation method and application

A biomass fiber and adsorption material technology, applied in the field of biomass smart fiber-based amphoteric multifunctional adsorption material and its preparation, can solve the problems of low regeneration temperature, low removal rate and removal efficiency, difficulty in both adsorption capacity, etc. To achieve the effect of promoting the adsorption rate

Active Publication Date: 2021-01-29
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the cellulose-based heavy metal ion adsorption materials reported so far have complex preparation processes, and because the material itself has a low density of functional groups for adsorbing heavy metal ions, the removal rate and removal efficiency are relatively low, especially at low concentrations. Poor, and difficult to achieve simultaneous removal of anionic and cationic heavy metal ions
[0003] Currently, CO 2 The capture methods mainly include absorption method, membrane separation method, adsorption method and deep condensation method, among which the adsorption method is based on the selective capture and separation of CO on the surface active points of porous materials 2 , has the advantages of operational flexibility and low operating cost, but traditional CO 2 Adsorbent materials face difficulty in maintaining high CO 2 Problems with adsorption capacity and low regeneration temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S1. Preparation of carboxylated biomass fibers: Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of bagasse pulp fibers, and stir the suspension in a sealed flask at 500rmp and 55°C, Then add 0.025g TEMPO, then add 1.69M, 1.183mL sodium hypochlorite solution, finally add 2.1307g sodium chlorite, oxidize for 17h, add 5mL ethanol to quench, wash and dry to obtain carboxylated biomass fiber.

[0030] S2. Preparation of polyethyleneimine responsive to stepwise dual-temperature stimuli: 1.5 g of polyethyleneimine was dissolved in 10 mL of water, and 0.9 g of N-isopropylacrylamide was dissolved in 30 mL of water. Under the condition of 55° C. and magnetic stirring, 10 mL of polyethyleneimine aqueous solution was added dropwise into 30 mL of N-isopropylacrylamide aqueous solution, and after 22 hours of reaction, it was quenched with liquid nitrogen. All the obtained solutions were dialyzed in water with MWCO500D dialysis bag for 22 hours, and then freeze-dri...

Embodiment 2

[0035] S1. Preparation of carboxylated biomass fibers: Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of bagasse pulp fibers, and stir the suspension in a sealed flask at 500rmp and 60°C, then Add 0.026g TEMPO, then add 1.69M, 1.183mL sodium hypochlorite solution, finally add 2.1307g sodium chlorite, oxidize for 16h, add 5mL ethanol to quench, wash and dry to obtain carboxylated biomass fiber.

[0036] S2. Preparation of polyethyleneimine responsive to stepwise dual-temperature stimuli: 2.0 g of polyethyleneimine was dissolved in 10 mL of water, and 1.8 g of N-isopropylacrylamide was dissolved in 30 mL of water. Under the condition of 60° C. and magnetic stirring, 10 mL of polyethyleneimine aqueous solution was added dropwise to 30 mL of N-isopropylacrylamide aqueous solution, and after 24 hours of reaction, it was quenched with liquid nitrogen. All obtained solutions were dialyzed in water with MWCO500D dialysis bag for 24 hours, and then freeze-dried to ...

Embodiment 3

[0041] S1. Preparation of carboxylated biomass fibers: Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of bagasse pulp fibers, and stir the suspension in a sealed flask at 500rmp and 65°C, then Add 0.028g TEMPO, then add 1.69M, 1.183mL sodium hypochlorite solution, finally add 2.1307g sodium chlorite, oxidize for 15h, add 5mL ethanol to quench, wash and dry to obtain carboxylated biomass fiber.

[0042] S2. Preparation of polyethyleneimine responsive to stepwise dual-temperature stimuli: 2.5 g of polyethyleneimine was dissolved in 10 mL of water, and 2.7 g of N-isopropylacrylamide was dissolved in 30 mL of water. Under the condition of 65° C. and magnetic stirring, 10 mL of polyethyleneimine aqueous solution was added dropwise to 30 mL of N-isopropylacrylamide aqueous solution, and after 26 hours of reaction, it was quenched with liquid nitrogen. All the obtained solutions were dialyzed in water with MWCO500D dialysis bag for 26 hours, and then freeze-dried...

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Abstract

The invention discloses a biomass intelligent fiber-based amphoteric multifunctional adsorption material, a preparation method and an application thereof. The material is based on the step-type dual-temperature stimulus-responsive biomass smart fiber as the matrix, the amphoteric hyperbranched polyamine modified by crown ether as the functional reagent, and the step-type dual-temperature stimulus-responsive biomass smart fiber is directly synthesized by a cross-linking agent. It is obtained by one-step cross-linking and compounding with amphoteric hyperbranched polyamine modified by crown ether. The material has stepwise dual temperature stimulus responsiveness, high amino density (greater than 12mmol / g), carboxyl density (greater than 5mmol / g) and nano cavity.

Description

technical field [0001] The invention belongs to the technical field of biomass fiber modification, and in particular relates to a biomass smart fiber-based amphoteric multifunctional adsorption material and a preparation method and application thereof. Background technique [0002] At present, the removal technologies of heavy metal ions in water mainly include chemical precipitation, flotation, reduction, ion exchange, electrodialysis, solvent extraction, biosorption, membrane separation and adsorption. Adsorption is considered as a promising removal method due to its advantages of operational flexibility and low operating cost. However, most of the cellulose-based heavy metal ion adsorption materials reported so far have complex preparation processes, and because the material itself has a low density of functional groups for adsorbing heavy metal ions, the removal rate and removal efficiency are relatively low, especially at low concentrations. Poor, and it is difficult t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/34B01J20/30C08G73/02C02F1/28B01D53/02C02F101/20C02F101/22
CPCB01D53/02B01D2257/504B01J20/267B01J20/3425B01J20/3483C02F1/286C02F2101/20C02F2101/22C08G73/0206C08G73/028B01D2253/202B01D2256/245B01J20/28023B01J20/3208B01J20/3219B01J20/3282B01J20/3293Y02C20/40B01D2259/40088C02F1/285C02F1/288
Inventor 何辉周航王磊全宗艳陈智平覃程荣朱红祥
Owner GUANGXI UNIV
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