Method for preparing crosslinked chitosan microsphere heavy metal ion adsorbent

A technology of cross-linking chitosan and heavy metal ions, which is applied in the direction of microsphere preparation, microcapsule preparation, chemical instruments and methods, etc., can solve the problems of poor stability and limited application range, and achieve easy elution and good chemical stability , obvious economic and environmental benefits

Inactive Publication Date: 2012-08-01
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chitosan is easily soluble in acidic solution and has poor stability, which also limits its application range to a large extent.

Method used

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  • Method for preparing crosslinked chitosan microsphere heavy metal ion adsorbent
  • Method for preparing crosslinked chitosan microsphere heavy metal ion adsorbent
  • Method for preparing crosslinked chitosan microsphere heavy metal ion adsorbent

Examples

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Embodiment 1

[0053] Embodiment 1, a kind of preparation method of cross-linked chitosan microsphere heavy metal ion adsorbent comprises the following steps:

[0054] One, prepare cross-linked chitosan microspheres, carry out the following steps successively:

[0055] ①. At room temperature, add 12.5ml of acetic acid solution with a mass concentration of 4% to 0.5g of powdered chitosan. After the chitosan is fully dissolved, add 55ml of liquid paraffin. Stir for 10 minutes;

[0056] ②. Heat up the temperature of the product in step ① to 55°C, continue to stir at a speed of 350r / min for 10 minutes, then add 0.1ml (2 drops) of the emulsifier span-80 dropwise, and emulsify for 10 minutes at a speed of 350r / min. minutes; under the action of emulsifier, tiny chitosan droplets will be formed;

[0057] ③. Heat up the product obtained in step ② to 60°C, add 1.5ml of formaldehyde and react for 1.5 hours (stirring at a speed of 350r / min); the obtained product is transparent;

[0058] 4. In step 3....

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Abstract

The invention discloses a method for preparing a crosslinked chitosan microsphere heavy metal ion adsorbent. The method comprises the following steps of: 1) by taking chitosan as a material and liquid paraffin as an organic dispersing medium, protecting amino on chitosan C2 by using formaldehyde, and by taking epoxy chloropropane as a crosslinking agent, preparing a crosslinked chitosan microsphere by a reversed phase suspension crosslinking method; and 2) by taking the crosslinked chitosan microsphere as a matrix and 2-(chloromethyl)benzimidazole as a ligand, chemically grafting the crosslinked chitosan microsphere to obtain the crosslinked chitosan microsphere heavy metal ion adsorbent. The crosslinked chitosan microsphere heavy metal ion adsorbent prepared by the method has high adsorption speed, can selectively adsorb the Hg<2+> ion highly, can easily and completely desorb ions and can be repeatedly used.

Description

technical field [0001] The invention relates to a preparation method of a novel cross-linked chitosan microsphere heavy metal ion adsorbent, in particular to a modified chitosan material which has selective adsorption for heavy metal ions in food, good adsorption performance and reusability and its preparation method. Background technique [0002] At present, the commonly used heavy metal detection methods are graphite furnace atomic absorption spectrometry, ICP-AES, X-ray fluorescence spectrometry and so on. With the continuous development of modern analytical techniques and analytical instruments, the detection limits of elements have been greatly reduced. However, in the analysis process of some low-concentration heavy metal elements, the interference of a large number of coexisting elements makes direct determination difficult. One way to solve this problem is through the development of instrument coupling technology, such as ICP-MS, etc., but this method is more compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/26B01J13/14
Inventor 熊春华盛齐乐姚彩萍
Owner ZHEJIANG GONGSHANG UNIVERSITY
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