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Modified chitosan material capable of absorbing heavy metal ions and preparation method thereof

A technology for adsorbing heavy metals and chitosan, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc. Effect

Active Publication Date: 2011-08-24
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some physical and chemical properties of sodium alginate are greatly affected by the pH value.

Method used

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  • Modified chitosan material capable of absorbing heavy metal ions and preparation method thereof
  • Modified chitosan material capable of absorbing heavy metal ions and preparation method thereof
  • Modified chitosan material capable of absorbing heavy metal ions and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At room temperature, dissolve 24g of chitosan and 3g of sodium alginate into 1.6L and 150mL of water respectively, then add the sodium alginate solution into the chitosan solution, mix well, and slowly add 111mL of 1.5% Calcium chloride solution, stirring while adding dropwise, the dropwise addition is completed and fully stirred, the pH value of the solution is adjusted by dilute NaOH solution to 7.2 ± 0.2, after solid flocs appear, stand until solid gel appears, and then filter, The gel was dried at 35°C to obtain modified chitosan B.

Embodiment 2

[0024] At room temperature, dissolve 30g of chitosan and 3g of sodium alginate into 2L and 150mL of water respectively, then add the sodium alginate solution into the chitosan solution, mix well, and slowly add 111mL of 1.5% sodium alginate Calcium chloride solution, stirring while adding dropwise, complete the dropwise addition and fully stir, dilute NaOH solution to adjust the pH value of the solution to 7.2, after solid flocs appear, let stand until solid gel appears, then filter, the gel 35 °C drying to obtain modified chitosan C.

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Abstract

The invention discloses a modified chitosan material capable of absorbing heavy metal ions and a preparation method thereof. The modified chitosan material is prepared by a method comprising: dissolving the chitosan and sodium alga acid in water respectively to prepare chitosan solution at a concentration of 1.5 mass percent and sodium alga acid solution at a concentration of 2 mass percent; mixing the chitosan solution and sodium alga acid solution uniformly according to a mass ratio of the chitosan and the sodium alga acid of (8-10):1 under a room temperature condition, and dripping calcium chloride solution at a concentration of 1.5 mass percent according to a solid to liquid ratio of the sodium alga acid to the calcium chloride solution of 1:37 with stirring; fully stirring after dripping is finished; regulating the pH value of the solution to 7.2+-0.2 till solid floccules appear; standing till solid gel appears; and filtering, and drying the gel at 35 DEG C to obtain the modified chitosan material.

Description

Technical field: [0001] The invention relates to a material for adsorbing heavy metal ions and a preparation method thereof, in particular to a modified chitosan material with good adsorption performance and good stability for heavy metal ions in seawater medium and a preparation method thereof. Background technique: [0002] Chitosan, also known as chitin, amino polysaccharide, chitosan, etc., is a natural polymer linear polysaccharide, which is a derivative of chitin hydrolyzed under alkaline conditions and part of the acetyl group removed. In nature, chitin is the second largest organic resource after cellulose, so chitosan is rich in sources. Chitosan can form a network-like cage molecule with the help of hydrogen bonds and ionic bonds, and has a strong adsorption capacity for heavy metal ions. In recent years, it has attracted much attention as a heavy metal adsorption material. Chitosan, as a waste from the seafood processing industry, is used as an adsorbent. Althoug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08L5/04B01J20/30B01J20/24C02F1/28C02F1/62
Inventor 郭鹏然王畅王和平魏强余欣达郑少琼梁淑君
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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