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Preparation method of alkali lignin composite adsorption material

A composite adsorption material and a technology for alkali lignin, which is applied in the field of preparation of alkali lignin composite adsorption materials, can solve problems such as poor adsorption performance, and achieve low cost, good adsorption performance of heavy metal ions and organic dyes, and a wide range of raw materials. Effect

Pending Publication Date: 2020-09-22
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption performance of alkali lignin before chemical modification is very poor, and it is basically not used as an adsorption material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Firstly, 0.30 g of alkali lignin was weighed and dissolved in 100 mL of distilled water, ultrasonically dispersed until uniform, and then vacuum filtered after standing to remove impurities. Add 0.42g tetraethylenepentamine to the above solution, adjust the pH of the solution to 9.0 with 1mol / L NaOH solution, add 0.29g formaldehyde (37%wt) and place the above solution in an oil bath, react at 80°C for 4h, After cooling to room temperature, a brown alkali lignin-tetraethylenepentamine solution was obtained. Add 0.32 g of tannic acid to the above-mentioned alkali lignin-tetraethylenepentamine solution, react at room temperature for 48 hours, centrifuge, wash, and freeze-dry to finally obtain an alkali lignin composite adsorption material after the reaction.

[0022] The reaction yielded 0.42 g of the product.

[0023] The adsorption capacity of the alkali lignin composite adsorption material prepared by the above method to the Congo red solution was 457mg / g. The adsorpt...

Embodiment 2

[0025] Firstly, 0.30 g of alkali lignin was weighed and dissolved in 100 mL of distilled water, ultrasonically dispersed until uniform, and then vacuum filtered after standing to remove impurities. Add 0.30g of tetraethylenepentamine to the above solution, adjust the pH of the solution to 10.0 with 1mol / L NaOH solution, add 0.15g of formaldehyde (37%wt), put the above solution in an oil bath, and react at 90°C for 5h. After cooling to room temperature, a brown alkali lignin-tetraethylenepentamine solution was obtained. Add 0.20 g of pyrogallol to the above-mentioned alkali lignin-tetraethylenepentamine solution, react at room temperature for 48 hours, centrifuge, wash, and freeze-dry to finally obtain an alkali lignin composite adsorption material after the reaction.

[0026] The reaction yielded 0.38 g of the product.

[0027] The adsorption capacity of the alkali lignin composite adsorption material prepared by the above method to the Congo red solution was 426 mg / g. The a...

Embodiment 3

[0029] Firstly, 0.30 g of alkali lignin was weighed and dissolved in 100 mL of distilled water, ultrasonically dispersed until uniform, and then vacuum filtered after standing to remove impurities. Add 0.18g of tetraethylenepentamine to the above solution, adjust the pH of the solution to 11.0 with 1mol / L NaOH solution, add 0.19g of formaldehyde (37%wt), put the above solution in an oil bath, and react at 90°C for 5h. After cooling to room temperature, a brown alkali lignin-tetraethylenepentamine solution was obtained. Add 0.16 g of tannic acid to the above-mentioned alkali lignin-tetraethylenepentamine solution, react at room temperature for 48 hours, centrifuge, wash, and freeze-dry to finally obtain an alkali lignin composite adsorption material after the reaction.

[0030] The reaction yielded 0.35 g of the product.

[0031] The adsorption capacity of the alkali lignin@poly(tannic acid-tetraethylenepentamine) composite prepared by the above method on the Congo red solutio...

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Abstract

The invention discloses a preparation method of an alkali lignin composite adsorption material. The lignin composite adsorption material contains alkali lignin, tetraethylenepentamine, formaldehyde (37% wt), tannic acid or pyrogallol or a mixture thereof. The preparation method of the composite material comprises the following steps: firstly, weighing a certain amount of alkali lignin, dissolvingthe alkali lignin in distilled water, ultrasonically dispersing to be uniform, standing, and performing reduced-pressure suction filtration to remove impurities; adding a certain proportion of tetraethylenepentamine and formaldehyde (37% wt) into an obtained solution, and adjusting the pH value of the solution; and putting the solution into an oil bath pan, reacting for a certain time, and coolingto room temperature to obtain a dark brown alkali lignin-tetraethylenepentamine solution; adding a certain amount of tannic acid or phloroglucinol or a mixture of the tannic acid and the phloroglucinol into the alkali lignin-tetraethylenepentamine solution, and reacting at room temperature; and after the reaction is finished, centrifuging, washing and freeze-drying to finally obtain the alkali lignin composite adsorption material. The preparation method is wide in raw material source, controllable in process, good in repeatability, low in cost, stable in adsorption performance and convenientto popularize and use. The prepared alkali lignin-based polyphenol amine composite adsorption material has good adsorption performance, can be applied to adsorption of heavy metal ions and organic dyes, and has a wide actual application prospect.

Description

technical field [0001] The invention relates to the field of preparation of adsorbents, in particular to a method for preparing an alkali lignin composite adsorption material that adsorbs heavy metal ions, and belongs to the technical field of functional polymer materials. Background technique [0002] With the development of industry and the advancement of science and technology, the chemical industry continues to develop, and environmental problems have become increasingly prominent. More and more harmful substances are discharged into the environment. Chromium, nickel, copper, zinc, cadmium, Various heavy metal ions such as lead and mercury have caused serious pollution to rivers, lakes and seas. Due to the special properties of dyes, dye wastewater not only has high organic content and high COD, but also has high chroma and toxicity, which seriously endangers human health. At present, common wastewater treatment methods, such as biological treatment, reduction, membrane...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/22C02F101/30
CPCB01J20/24C02F1/286C02F2101/22C02F2101/308
Inventor 刘钦泽郝晓晴宋培勇张艳
Owner QILU UNIV OF TECH
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