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Lignin heavy metal ion adsorbent and preparation method thereof

A technology of heavy metal ions and adsorbents, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as easy solubility in water and low adsorption capacity

Inactive Publication Date: 2012-07-04
DALIAN POLYTECHNIC UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

Since alkali lignin has disadvantages such as low adsorption capacity and easy solubility in water when used directly as a heavy metal adsorbent, it cannot be directly used in industrial production, so it needs to be modified

Method used

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  • Lignin heavy metal ion adsorbent and preparation method thereof
  • Lignin heavy metal ion adsorbent and preparation method thereof

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Experimental program
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Embodiment 1

[0030] The first step, the extraction of alkali lignin

[0031] Weigh 1 kg of dry reed raw material, cook with 5 kg of 20wt% sodium hydroxide for 3.5 hours, heat up for 1.5 hours, keep warm for 2 hours, and keep warm at 170°C. After the cooking is completed, collect the black liquor, adjust the pH value of the black liquor to about 8 with 20wt% sulfuric acid, centrifuge at 5000r / min for 30min to remove precipitated impurities, then adjust the pH value to 3, and centrifuge at 5000r / min for 30min. The precipitated substance was washed with deionized water to remove excess acid until the pH was 7, and dried in a vacuum oven at 80°C to a moisture content of 5%, and the obtained substance was called alkali lignin. Pass through a 40-mesh sieve after drying.

[0032] The second step, hydroxymethylation

[0033] Add 2ml of formaldehyde solution with a mass fraction of 95% to 10g of alkali lignin, add 5ml of 0.1mol / L sodium hydroxide, and react at 80°C for 1.5h.

[0034] The third s...

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Abstract

The invention discloses phenolic modified lignin and a preparation method thereof, and application of the phenolic modified lignin serving as an adsorbent to adsorb heavy metal ions. The preparation method comprises the following steps of: adding alkali into a reed raw material, stewing, adjusting the pH value and extracting alkali lignin; adding formaldehyde and sodium hydroxide into the alkali lignin, heating to make the alkali lignin subjected to hydroxymethylation, adding phenol into the product, and heating to make the product subjected to phenolate; and adjusting the pH value of the product by using sulfuric acid, and centrifugating, washing, depositing and drying to prepare the phenolic modified lignin. According to the method, the lignin is modified, so that the hydroxyl content in the lignin is increased, and the adsorption property of the lignin is improved; furthermore, after the lignin is modified, the solubility of the lignin in water is lower than that of the alkali lignin; and the phenolic modified lignin can be used as a heavy metal ion adsorbent.

Description

technical field [0001] The invention relates to the field of new materials, in particular to the field of lignin modification, in particular to a method for modifying lignin contained in papermaking by-products to improve its adsorption capacity for heavy metal ions. Background technique [0002] At present, the heavy metal ion treatment methods mainly include the precipitation method of adding alkali neutralizer (the treatment effect is poor, the amount of sediment is large, the water content is high, and it is easy to cause secondary pollution), and the sulfide precipitation method (it is easy to produce H in acidic wastewater. 2 S, must be treated again when draining, the process of treating wastewater is long, the operation is cumbersome, and the treatment cost is high, which limits the application of sulfide precipitation method), ferrite precipitation method (large energy consumption, long treatment cycle), electrolysis method (Large energy consumption, small amount of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 杨瑞丰鲁杰张飞宇
Owner DALIAN POLYTECHNIC UNIVERSITY
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