Preparation method of efficient polyethyleneimine modified cellulose-based heavy metal adsorbent

A technology based on polyethyleneimine and cellulose, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problem of restricting the fixed amount of functional groups, affecting the adsorption effect of adsorbents, and difficult to ensure Epoxy group content and other issues, to achieve the effects of easy control of production operation and temperature, high grafting rate and monomer conversion rate, easy mixing and heat dissipation

Inactive Publication Date: 2013-09-18
SHANDONG UNIV
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Problems solved by technology

However, there are some deficiencies in the existing preparation methods, such as the epoxy group is not resistant to acid and alkali, and it is difficult to ensure the content of the epoxy group while ensuring the grafting rate of the graft copolymerization reaction, which restricts the function of the unit adsorbent. The amount of immobilized groups, which ultimately affects the adsorption effect of the adsorbent

Method used

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  • Preparation method of efficient polyethyleneimine modified cellulose-based heavy metal adsorbent
  • Preparation method of efficient polyethyleneimine modified cellulose-based heavy metal adsorbent
  • Preparation method of efficient polyethyleneimine modified cellulose-based heavy metal adsorbent

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Effect test

Embodiment 1

[0035] The preparation of the glycidyl methacrylate graft modified cellulose Cell-g-PGMA shown in embodiment 1. formula (IV)

[0036] (1) 1.0 g of microcrystalline cellulose represented by formula (II) was vacuum-dried at 50°C to constant weight, dispersed in a mixed system of 5mL acetone and 10mL deionized water, the temperature of the water bath was 70°C, stirred with a magnet and passed through nitrogen Deoxygenation for 15 minutes.

[0037] (2) Add the initiator BPO concentration 0.028mol.L to the above system -1 , monomer GMA concentration shown in formula (III) 19.2mmol.L -1 , blow nitrogen and keep at 70°C, stir at constant temperature for 2.5h, then stop heating.

[0038] (3) After the system was cooled to room temperature, the crude product was obtained by suction filtration, and washed with deionized water and acetone.

[0039] (4) Acetone was used as a solvent to remove the homopolymer produced during the reaction to obtain Cell-g-PGMA represented by formula (IV)...

Embodiment 2

[0040] Embodiment 2. As described in Example 1, the difference is that the GMA monomer concentration shown in the change formula (III) is 15.1mmol.L -1 , the calculated grafting rate G P 150%, grafting efficiency G E was 69.9%.

Embodiment 3

[0041] Embodiment 3. as described in embodiment 1, difference is that the GMA monomer concentration shown in changing formula (III) is 11.3mmol.L -1, the calculated grafting rate G P 99.9%, grafting efficiency G E was 62.1%.

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Abstract

The invention discloses a preparation method of an efficient polyethyleneimine modified cellulose-based heavy metal adsorbent shown by a formula (I), belonging to the technical field of high-molecular function modification and synthesis of a natural material. By adopting cellulose as a framework, benzoyl peroxide (BPO) as an initiator, a mixture of water and acetone as a solvent and glycidyl methacrylate (GMA) shown by a formula (III) as a monomer, the method comprises the following steps of: performing a free radical-initiated graft copolymerization reaction on the surface of microcrystalline cellulose shown by a formula (II); performing amination on a graft product shown by a formula (IV) by use of graft polyethyleneimine (PEI) shown by a formula (V); and washing and drying the product to obtain a powdery solid product, wherein the reaction is easy to operate, and the conditions are mild. The heavy metal adsorbent prepared by the preparation method has the advantages of excellent adsorption property, large adsorption capacity and fast adsorption, can be regenerated and recycled, and has broad application prospects in the water treatment fields such as control of heavy metal industrial pollutants and the like.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency polyethyleneimine modified cellulose-based heavy metal adsorbent, which belongs to the technical field of functional modification of natural polymer materials. Background technique [0002] Heavy metals are a type of metal elements with a density more than five times that of pure water. The exponential growth of their applications in many fields such as industry, agriculture, medical care, and technology has resulted in a significant increase in the level of human exposure. Excessive heavy metals will cause a series of human beings. Diseases and water heavy metal pollution have become one of the most serious environmental problems worldwide. At present, the methods for removing heavy metal ions from wastewater are mainly: chemical precipitation, membrane filtration, electrochemical method, ion exchange method, coagulation method, flotation method, and adsorbent adsorption method. Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08G73/04C08F251/02C08F220/32B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 孟凡君汤银川车玉菊马庆林
Owner SHANDONG UNIV
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