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Method for preparing novel tannic acid curing chitosan heavy metal ion adsorbent

A technology of heavy metal ions and chitosan, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, to achieve the effects of reducing sewage treatment costs, easy desorption, and large adsorption capacity

Inactive Publication Date: 2011-03-30
付华峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem is that the cost of the adsorbent is an important factor limiting the use of the adsorbent. When the modified chitosan is used in the treatment of heavy metal wastewater, attention should be paid to the recovery of the adsorbent performance and to increase the repeated use times of the adsorbent.

Method used

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  • Method for preparing novel tannic acid curing chitosan heavy metal ion adsorbent
  • Method for preparing novel tannic acid curing chitosan heavy metal ion adsorbent

Examples

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Effect test

Embodiment 1

[0012] The preparation method of chitosan solidified tannic acid heavy metal ion adsorbent comprises the following two steps: the preparation of novel chitosan solidified tannic acid polysaccharide particles

[0013] Weigh 1.449 g of chitosan and dissolve it in 150 ml of water, add 0.648 g of acrylic acid and stir until completely dissolved, transfer it to a 250 ml four-neck bottle, under the protection of an oil bath and nitrogen, add 0.081 g of potassium persulfate at 70 ° C, stir to make the reaction When turbidity appears in about 1 hour, stop the reaction immediately and cool down rapidly, transfer it to a suction filter bottle, and filter it under a vacuum of 0.1 MPa, centrifuge the filtrate on a high-speed centrifuge at 12000r / min for 30 minutes, and wash the precipitate with distilled water until it is neutral, that is, Chitosan particles are available. Weigh 5 g of tannic acid in 100 mL of distilled water, adjust pH=7, filter to make it a clear solution, add chitosan ...

Embodiment 2

[0015] Preparation of novel chitosan solidified tannic acid polysaccharide particles

[0016] Weigh 1.449 g of chitosan and dissolve it in 150 ml of water, add 0.648 g of acrylic acid and stir until it is completely dissolved, transfer it to a 250 ml four-neck bottle, add 0.081 g of azoisopropylcyanide at 70 °C under the protection of an oil bath and nitrogen, and stir Make the reaction turbid for about 1 hour, stop the reaction immediately and cool it down quickly, transfer it to a suction filter bottle, filter it under a vacuum of 0.1 MPa, centrifuge the filtrate on a high-speed centrifuge at 12000r / min for 30 minutes, and wash the precipitate with distilled water until neutral , to obtain chitosan particles. Weigh 5 g of tannic acid in 100 mL of distilled water, adjust pH=7, filter to make it a clear solution, add chitosan particles, stir and react at 30° C. for 6 h, filter with suction and rinse with distilled water until neutral. Transfer the product to 300 mL of epichlo...

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Abstract

The invention relates to a method for preparing a novel tannic acid curing chitosan heavy metal ion adsorbent. The method comprises the following steps of: weighing certain amount of chitosan, dissolving into water, adding certain amount of macromolecule monomer, stirring toil the macromolecule monomer is completely dissolved, adding an initiator, stirring for reacting until turbidness occurs, filtering, centrifuging a filtrate on a high speed centrifuge, and washing precipitation to neutrality with water to obtain chitosan particles; weighing tannic acid and dissolving into water, adding the chitosan particles and reacting at constant temperature; introducing a product into an epoxy chloropropane solution, reacting at room temperature reaction, stirring in a water bath and reacting for a whole night, filtering, and washing with water to neutrality to obtain novel curing tannic acid chitosan particles. The novel tannic acid curing chitosan heavy metal ion adsorbent can quickly adsorb heavy metal ions from a water solution and quickly elute the heavy metal ions adsorbed on the adsorbent with a very small amount of acid, can be recycled more than 200 times and have the life as long as six months; in addition, the novel tannic acid curing chitosan heavy metal ion adsorbent can be used for processing heavy metal ion sewage, enriching trace amount heavy metal ions, recycling noble heavy metal ions and have low cost and excellent property.

Description

technical field [0001] The invention belongs to the field of preparation of heavy metal ion adsorbents, in particular to a preparation method of a novel tannic acid solidified chitosan heavy metal ion adsorbent. Background technique [0002] Chitosan (Chitosan) is a derivative of chitin (Chitin) hydrolyzed under alkaline conditions and removed part of the acetyl group, also known as chitin, amino polysaccharide, chitosan, etc., the chemical name is β-(1, 4) -2-Amino-2-deoxy-D-glucose, the source is quite abundant. In nature, the annual biosynthesis of chitin is about 10 billion tons. It is the second largest organic resource on the earth except cellulose, and it is a huge treasure house of resources waiting to be fully utilized by human beings. The coordination between chitosan and its derivatives and metal ions is mainly due to the presence of a large number of functional groups such as hydroxyl and amino groups in the molecular chain, which can form cage-like molecules wi...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 付华峰王丽娜向天成徐运卿陈秋霞
Owner 付华峰
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