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Preparation method of heavy metal ion absorbent (polyethyleneimine-sodium lignin sulfonate)

A technology of sodium lignosulfonate and polyethylenimine, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems affecting adsorption application and few active adsorption points , to achieve the effect of low cost, strong adsorption capacity and good stability

Inactive Publication Date: 2015-05-20
NORTHEAST FORESTRY UNIVERSITY +2
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  • Application Information

AI Technical Summary

Problems solved by technology

Lignin is a renewable resource with abundant sources, low price and non-toxicity. Lignosulfonate is a kind of industrial lignin, which is a cheap by-product of sulfite pulping process. Its molecular The structure contains a large number of functional groups such as hydroxyl, methoxyl, carboxyl, and sulfonic acid groups, making lignosulfonate widely used, but because the spatial configuration of lignosulfonate is between spheres and curly bodies, the activity There are relatively few adsorption points, and because of its good water solubility, its application in adsorption is affected. In order to further improve the performance of lignin, it needs to be modified physically and chemically.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] Dissolve 1g of sodium lignosulfonate in 100mL of water to form a sodium lignosulfonate solution, use hydrochloric acid to adjust the pH=5-6; take 2mL of polyethyleneimine solution with a mass concentration of 30% and add water to dilute it into a 20mL solution, and use Adjust the pH=9-10 with hydrochloric acid; add the above polyethylenimine solution dropwise into the sodium lignosulfonate solution, stir thoroughly, and finish adding dropwise in 10 minutes, then continue to stir mechanically for 3 hours, filter with suction and wash with distilled water until neutral, and then Dry at 60°C and grind to obtain a solid powder adsorbent.

example 2

[0013] Dissolve 3g of sodium lignosulfonate in 100mL of water to form sodium lignosulfonate solution; take 10mL of polyethyleneimine solution with a mass concentration of 30%; take 3mL of formaldehyde and add water to prepare 30mL of formaldehyde solution; Add the amine solution dropwise to the sodium lignosulfonate solution, stir well, then add the formaldehyde solution dropwise, ultrasonically and mechanically stir for 20 minutes, then stop the ultrasonic and continue mechanically stirring for 1 hour, filter with suction and wash with distilled water until neutral, dry at 45°C , and grind to obtain a solid powder adsorbent.

example 3

[0015] Dissolve 3g of sodium lignosulfonate in 100mL of water to make a sodium lignosulfonate solution; take 10mL of polyethyleneimine solution with a mass concentration of 30%; take 3mL of glyoxal and add water to prepare a 30mL glyoxal solution; Add the above polyethylenimine solution dropwise into the sodium lignosulfonate solution, stir well, then add the glyoxal solution dropwise, ultrasonically and mechanically stir for 20 minutes, then stop the ultrasonic and continue mechanically stirring for 1 hour, suction filter and wash with distilled water until neutral , dried at 45°C, and ground to obtain a solid powder adsorbent.

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Abstract

The invention aims to provide a preparation method of a heavy metal ion absorbent namely polyethyleneimine modified sodium lignin sulfonate. The heavy metal ion absorbent is prepared by grafting polyethyleneimine to sodium lignin sulfonate through static electricity or a chemical crosslinking method, and the property of the absorbent is stable. The surface of the absorbing material synthesized by the provided method is rich in active absorbing groups such as hydroxyl group, sulfonic acid group, amino group, and the like. The heavy metal ion absorbent has the advantages of simple preparation technology, low cost, and good stability, and is easy to promote and use. The provided absorbent has a strong absorbing performance on harmful metal ions such as Pb2+, Cd2+, Cu2+, Ni2+, and the like, and can be used to treat and purify wastewater containing heavy metal ions.

Description

technical field [0001] What field and what technology does the invention belong to? A preparation method of a heavy metal ion adsorbent comprising polyethyleneimine-sodium lignosulfonate is disclosed. Background technique [0002] The pollution of toxic heavy metal ions in industrial wastewater has attracted more and more attention. Heavy metal ions in industrial wastewater are toxic to the human body and can cause cancer, deformities and various diseases. In order to effectively control the pollution of heavy metals in wastewater, it is urgent to research and develop new processes to effectively remove heavy metal ions in industrial wastewater. [0003] The current methods for removing heavy metal ions in wastewater include: chemical precipitation, ion exchange, membrane separation, and chemical methods. The disadvantages of these methods are relatively high cost, complicated operation and difficult post-processing. Adsorption method is the most widely used method to ads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/26C02F1/28C02F1/62
CPCB01J20/26B01J20/3282B01J2220/44B01J2220/4837C02F1/288C02F1/62C02F2101/20
Inventor 张继国王艳方桂珍
Owner NORTHEAST FORESTRY UNIVERSITY
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