PEI (polyethyleneimine) modified cellulose membrane adsorbent and preparation method thereof

A cellulose membrane, adsorbent technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve problems such as environmental pollution, difficulty in adsorbent separation, and complex adsorbent preparation process. , to achieve the effect of reducing costs, avoiding adverse effects, and making the preparation process environmentally friendly and pollution-free

Active Publication Date: 2018-03-27
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a PEI modified cellulose membrane adsorbent and its preparation method, which can effectively solve the complicated preparation process of the existing adsorbent and the need to use a cross-linking agent, which brings certain harm to the environment. Pollution and the difficulty of separating the adsorbent during use, which increases the cost of secondary separation

Method used

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  • PEI (polyethyleneimine) modified cellulose membrane adsorbent and preparation method thereof
  • PEI (polyethyleneimine) modified cellulose membrane adsorbent and preparation method thereof
  • PEI (polyethyleneimine) modified cellulose membrane adsorbent and preparation method thereof

Examples

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Embodiment 1

[0033] (1) Take the NMMO solution with a concentration of 50%, mix it with the antioxidant propyl gallate, distill it under reduced pressure at 85°C until the water content of the solution is 13%, take 95g of the concentrated NMMO solution, add 5g of cotton pulp cellulose, and stir Dissolve and vacuum defoam to obtain a cellulose solution with a mass concentration of 5%.

[0034] (2) Scrape the prepared cellulose solution on the substrate, then place it in water to gel, and finally wash off the solvent with water to obtain a cellulose hydrogel film.

[0035] (3) Put 2g of cellulose hydrogel membrane into 50mL of hydrogen peroxide solution with a concentration of 0.2% and pH=4, react at 85°C for 2h, after the reaction is completed, wash with water to obtain an oxidized cellulose hydrogel membrane .

[0036] (4) Immerse the oxidized cellulose hydrogel obtained above into 50 mL of PEI solution with a concentration of 3% and pH=11, and react at room temperature for 2 hours. After...

Embodiment 2

[0049] (1) Take a 50% NMMO solution, mix it with propyl gallate antioxidant, and distill it under reduced pressure at 85°C until the water content of the solution is 13%. Take 96 g of the concentrated NMMO solution, add 4 g of cotton pulp cellulose, stir to dissolve, and vacuum defoam to obtain a cellulose solution with a mass concentration of 4%.

[0050] (2) Scrape the prepared cellulose solution on the substrate, then place it in water to gel, and finally wash off the solvent with water to obtain a cellulose hydrogel film.

[0051] (3) Put 2 g of cellulose hydrogel film into 50 mL of hydrogen peroxide solution with a concentration of 0.4% and pH=3, and react at 85°C for 3 hours. After the reaction is completed, wash it with water to obtain an oxidized cellulose hydrogel film .

[0052] (4) Immerse the oxidized cellulose hydrogel obtained above into 50 mL of PEI solution with a concentration of 2% and pH=10, and react at room temperature for 2 hours. After the reaction, was...

Embodiment 3

[0056] (1) Soak and activate the cellulose in distilled water, absolute ethanol, and DMAC in sequence (during the soaking and activation step, distilled water, absolute ethanol, and DMAC can fully soak the cellulose), and then put it in an oven at 105°C to dry until the quality is high. Until there is no change; weigh 4 g of dried activated cellulose and put it into 96 g of LiCl (4.8 g)-DMAC (91.2 g) solvent to obtain a cellulose solution with a mass concentration of 4%.

[0057] (2) Scrape the prepared cellulose solution on the substrate, then place it in water to gel, and finally wash off the solvent with water to obtain a cellulose hydrogel film.

[0058] (3) Put 2 g of cellulose hydrogel film into 50 mL of hydrogen peroxide solution with a concentration of 0.2% and pH=5, and react at 85° C. for 3 hours. After the reaction is completed, wash it with water to obtain an oxidized cellulose hydrogel film .

[0059] (4) Immerse the oxidized cellulose hydrogel obtained above int...

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Abstract

The invention provides a PEI (polyethyleneimine) modified cellulose membrane adsorbent and a preparation method thereof. The preparation method comprises the steps of (1) preparing a cellulose solution; (2) defoaming, knifing, gelatinizing and washing the cellulose solution to prepare a cellulose hydrogel membrane; (3) oxidizing an object obtained in the step (2) into a hydrogen peroxide solutionto obtain an oxidized cellulose hydrogel membrane; (4) soaking an object obtained in the step (3) into a PEI water solution for reacting, and washing with water after finishing reaction to obtain a PEI modified cellulose hydrogel membrane; (5) drying an object obtained in the step (4), and preparing the PEI modified cellulose membrane adsorbent. The preparation method is simple, and no cross-linking agent needs to be used during a preparation process, so that not only is the cost favorably reduced, but also adverse effects brought by additive residues are avoided; meanwhile, the preparation process is environmentally friendly without pollution, and the prepared adsorbent has an excellent adsorption effect on heavy metal ions and is easy to separate and recover after use.

Description

technical field [0001] The invention belongs to the technical field of biological adsorption materials, and in particular relates to a PEI modified cellulose membrane adsorbent and a preparation method thereof. Background technique [0002] Smelting, electrolysis, medicine, paint, electroplating, textile printing and dyeing and other industries discharge a large amount of industrial wastewater containing various heavy metal ions every year. Heavy metals have the characteristics of carcinogenicity, teratogenicity, strong toxicity, refractory degradation and easy bioaccumulation, etc., which have always been the difficulty of wastewater treatment. The adsorption method has simple equipment, easy operation, and low cost. It is the most common technology in the field of heavy metal wastewater treatment. However, the commonly used adsorbent in the traditional adsorption method is activated carbon, which is expensive and difficult to regenerate. Therefore, it is of great signific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
CPCB01J20/24B01J20/28033B01J20/3085B01J2220/4825
Inventor 张胜利陈豪宇凯橙橙周祚万姜曼王群苏凯
Owner SOUTHWEST JIAOTONG UNIV
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