A kind of preparation method and application of citric acid grafted chitosan pellets

A technology of citric acid and chitosan, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., to achieve the effects of low cost, good selectivity and good stability

Active Publication Date: 2021-10-15
GUANGZHOU ENVIRONMENTAL PROTECTION TECH EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Among the heavy metal elements, many elements still have great recycling value, but in the current heavy metal adsorption technology, there is still a lot of room for improvement in the selective adsorption of specific ions

Method used

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  • A kind of preparation method and application of citric acid grafted chitosan pellets
  • A kind of preparation method and application of citric acid grafted chitosan pellets

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Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0037] Embodiment 1-6: the preparation of citric acid grafted chitosan pellet

[0038] (1) Add the CTAB of formula dosage to 100mL distilled water, adjust the temperature to 46°C in the water bath, start stirring at 1000rpm, stir for 15min, then add chitosan (deacetylation degree ≥ 90.0%, 700,000-800,000 molecular weight), keep stirring for 40 minutes, then add the amount of citric acid used in the formula, and stir at room temperature for 5 hours to obtain a uniform and stable gel.

[0039] (2) Pour the above-mentioned gel into a 50mL burette, dropwise dropwise into 600mL of 1mol / L sodium hydroxide solution under magnetic stirring, to form wet gel balls with a particle size of 2.5-3.5mm.

[0040] (3) Vacuum freeze-dry the above-mentioned wet gel ball at -80°C for 20 h to obtain loose and porous citric acid grafted chitosan pellets.

[0041] Embodiment 1-6 formula is as shown in table 1:

[0042] Table 1.

[0043] Dosage (g) Example 1 Example 2 Example 3 Ex...

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Abstract

The invention discloses a preparation method and application of citric acid grafted chitosan pellets, belonging to the technical field of heavy metal adsorbents. The preparation method comprises the following steps: adding chitosan into the stirred CTAB solution, keeping the state of stirring, then adding citric acid, and mixing evenly to obtain a gel; pouring the obtained gel into a burette, and stirring it drop by drop drop into sodium hydroxide solution to collect wet gel balls; freeze-dry the obtained wet gel balls to obtain the citric acid grafted chitosan pellets. The pellets can greatly increase the adsorption capacity, have stronger selectivity to specific ions, can be applied to the removal and recovery of heavy metal elements, and can improve the stability of the pellets in water, and have good application prospects.

Description

technical field [0001] The invention belongs to the technical field of heavy metal adsorbents, in particular to a preparation method and application of citric acid grafted chitosan pellets. Background technique [0002] The discharge of a large amount of heavy metal wastewater (such as lead, chromium, arsenic, cadmium, copper, etc.) produced by industrialization and urbanization has seriously endangered human health, especially most metal ions and their compounds are easily adsorbed and precipitated by suspended particles in water In the sedimentary layer of the water body, it will pollute the water body for a long time and produce toxic effects on the human body. At present, the methods for treating heavy metals in water include chemical precipitation, ion exchange, membrane filtration, electrochemical method, reverse osmosis method, solvent extraction method, adsorption method and so on. Among them, the adsorption method has significant advantages such as low cost and hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28019B01J20/28047C02F1/286C02F2101/20
Inventor 张文斌高忠本汪晖吴天龙利进卓
Owner GUANGZHOU ENVIRONMENTAL PROTECTION TECH EQUIP
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