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Preparation method, product and application method of carbonized chitosan adsorbent

A carbonized chitosan, application method technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of limited heavy metal ion capacity and small specific surface area, etc.

Inactive Publication Date: 2015-12-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the small specific surface area of ​​these materials, the capacity of adsorbing and removing heavy metal ions in water is relatively limited.

Method used

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  • Preparation method, product and application method of carbonized chitosan adsorbent
  • Preparation method, product and application method of carbonized chitosan adsorbent
  • Preparation method, product and application method of carbonized chitosan adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Prepare 0.1mol / L FeCl 3 Solution 100mL (0.01mol), slowly add chitosan 2.67g (molecular weight is 1 million, deacetylation degree is 91%), make chitosan and Fe 3+ The molar ratio of the chitosan-iron complex is 1.5:1, keep stirring for 4 hours to make the two fully react, then slowly add 50mL of ethanol and stir slowly at the same time, after the chitosan-iron complex precipitation is gradually formed, centrifuge and wash with absolute ethanol to unreacted Fe 3+ , add 100mL14wt% NaOH solution to the chitosan iron prepared by the above reaction, then add 2mLCS 2 solution, stirred and reacted for 24 hours, after the reaction was completed, repeatedly washed with water until the solution was neutral, and dried at 80°C; finally, the chitosan iron modified by the mercapto group was put into a tube furnace and calcined at 450°C for 1h under the protection of nitrogen. Grinding to prepare carbonized chitosan adsorbent.

[0036] Figure 1(a) and Figure 1(b) The scanning ele...

Embodiment 2

[0038] Prepare 0.2mol / L FeCl 3 Solution 100mL (0.01mol), slowly add chitosan 3.56g (molecular weight is 1 million, deacetylation degree is 91%), make chitosan and Fe 3+ The molar ratio of the chitosan-iron complex is 1:1, keep stirring for 2 hours to make the two fully react, then slowly add 50mL of ethanol and stir slowly at the same time, after the chitosan-iron complex precipitates gradually form, centrifuge and wash with absolute ethanol to unreacted Fe 3+ , add 100mL14wt% NaOH solution to the chitosan iron prepared by the above reaction, then add 2mLCS 2 solution, stirred and reacted for 24 hours, after the reaction was completed, repeatedly washed with water until the solution was neutral, and dried at 80°C; finally, the chitosan iron modified by the mercapto group was put into a tube furnace and calcined at 450°C for 1h under the protection of nitrogen. Grinding to prepare carbonized chitosan adsorbent.

Embodiment 3

[0040] Prepare 0.1mol / L FeCl 3 Solution 100mL (0.01mol), slowly add chitosan 2.67g (molecular weight is 1 million, deacetylation degree is 91%), make chitosan and Fe 3+ The molar ratio of the chitosan-iron complex is 1.5:1, keep stirring for 4 hours to make the two fully react, then slowly add 50mL of ethanol and stir slowly at the same time, after the chitosan-iron complex precipitation is gradually formed, centrifuge and wash with absolute ethanol to unreacted Fe 3+ , add 100mL14wt% NaOH solution to the chitosan iron prepared by the above reaction, then add 2mLCS 2 solution, stirred and reacted for 24 hours, after the reaction was completed, repeatedly washed with water until the solution was neutral, and dried at 80°C; finally, put the thiol-modified iron chitosan into a tube furnace and calcined at 300°C for 1h under the protection of nitrogen. Grinding to prepare carbonized chitosan adsorbent.

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Abstract

The invention discloses a preparation method of a carbonized chitosan adsorbent. The preparation method comprises the following steps: (1) dissolving chitosan into a metal salt water solution, stirring, adding ethanol, separating solids, and filtering and washing the solids to obtain chitosan-metal complex; (2) preparing a sodium hydroxide water solution, adding the obtained chitosan-metal complex, then adding CS2, stirring until the reaction is over, washing with clean water until the washing solution is neutral, drying, and finally calcining the obtained solid at 300-600 DEG C under the protection of nitrogen to obtain the carbonized chitosan adsorbent. The invention further discloses the adsorbent and an application method of the adsorbent for removing heavy metal from water. The method for removing heavy metal from water is simple to operate and low in cost, and has an environmental-friendly effect and industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of post-treatment of wastewater, and in particular relates to a preparation method, product and application method of a carbonized chitosan adsorbent. Background technique [0002] At present, the problem of heavy metal pollution in my country's water is very prominent, and the pollution rate of the bottom of rivers, lakes and reservoirs is as high as 80.1%. In recent years, heavy metal pollution incidents have occurred frequently in our country. Once heavy metals enter the human body, they will accumulate in certain organs and cause chronic poisoning, which seriously endangers human health. Children's blood lead exceeded the standard, Hunan Liuyang cadmium pollution, Yunnan Yangzonghai arsenic pollution, and collective blood lead of children in Shanghang, Fujian and Jiyuan, Henan exceeded the standard. In natural water bodies, as long as there is a trace amount of heavy metals, it can produce toxic effects...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
Inventor 文岳中陈洁马建青刘维屏
Owner ZHEJIANG UNIV
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