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Preparation method and application of citric acid grafted chitosan beads

A technology of citric acid and chitosan, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., to achieve the effects of simple preparation method, increased adsorption capacity, and good selectivity

Active Publication Date: 2021-06-01
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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  • Preparation method and application of citric acid grafted chitosan beads
  • Preparation method and application of citric acid grafted chitosan beads

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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 beads, and belongs to the technical field of heavy metal adsorbents. The preparation method comprises the following steps of: adding chitosan into a stirred CTAB (Cetyltrimethyl Ammonium Bromide) solution, keeping a stirring state, then adding citric acid, and uniformly mixing to obtain gel; pouring the obtained gel into a burette, dropwise adding the gel into a sodium hydroxide solution under magnetic stirring, and collecting to obtain wet gel beads; and carrying out freeze drying treatment on the obtained wet gel beads to obtain the citric acid grafted chitosan beads. The beads can have greatly improved adsorption capacity, has higher selectivity for specific ions, can be applied to removal and recovery treatment of heavy metal elements, the stability of the beads in water is improved, and the beads have a good application prospect.

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 Applications(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