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A kind of n-carboxyethyl chitosan nano magnetic beads and its preparation method and application

A technology of carboxyethyl chitosan and nano-magnetic beads, applied in the field of chemistry, can solve the problems of low adsorption capacity, difficult desorption, and high cost, and achieve the effects of improving adsorption capacity and broadening the scope of application and conditions.

Active Publication Date: 2018-09-28
杭州丹威生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorbents that have been developed and used mainly include activated carbon, synthetic resin, biomass, clay, peat, activated sludge, etc., but most of them have problems such as high cost, complicated operation, low adsorption capacity, and difficult desorption.

Method used

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  • A kind of n-carboxyethyl chitosan nano magnetic beads and its preparation method and application
  • A kind of n-carboxyethyl chitosan nano magnetic beads and its preparation method and application
  • A kind of n-carboxyethyl chitosan nano magnetic beads and its preparation method and application

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Embodiment 1

[0025] 1. Preparation of nanomagnetic beads

[0026] Take 5.4g FeCl 3 ·6H 2 O and 1.99 g FeCl 2 4H 2 O was dissolved in 50 mL of deionized water. Quickly add 12mL concentrated ammonia water to the mixture and keep stirring, at 80°C, N 2 The reaction was stirred vigorously under protection for 2 hours. After the reaction, the precipitate was washed with deionized water until the pH of the washing solution was neutral, and filtered through a Buchner funnel. The obtained solid was dried in a blast drying oven at 60°C for 12 hours, ground and pulverized to obtain Fe 3 o 4 magnetic beads.

[0027] 2. Preparation of N-carboxyethyl chitosan

[0028] 2g chitosan and 3-chloropropionic acid were dissolved in 140mL ddH at a molar ratio of 1:5 2 O, magnetically stirred for 1 hour until the chitosan was fully dissolved. Equimolar amount of NaHCO with 3-chloropropionic acid 3 Slowly add to the chitosan solution in batches and stir for more than 30 minutes to remove excess CO 2 ...

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Abstract

The invention discloses N-carboxyethyl chitosan magnetic nano-beads as well as a preparation method and an application thereof and belongs to the technical field of chemistry. The preparation method of the N-carboxyethyl chitosan magnetic nano-beads comprises steps that N-carboxyethyl chitosan, Fe3O4 nanoparticles and a crosslinking agent are dissolved in an acetic acid solution for a reaction, the pH value is regulated to neutral after the reaction, a precipitate is collected, washed and dried, and the N-carboxyethyl chitosan magnetic nano-beads are obtained. The magnetic nano-beads are coated with N-carboxyethyl chitosan, so that metal ion adsorption capacity is improved, especially the adsorption of heavy metal such as Cu (II) and Pb (II) is remarkably superior to that of most like adsorbents at present, and the magnetic nano-beads can be used for removing heavy metal in wastewater; the N-carboxyethyl chitosan magnetic nano-beads can be recovered by magnets, and the application range and conditions of the N-carboxyethyl chitosan magnetic nano-beads are broadened.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to N-carboxyethyl chitosan nano magnetic beads and a preparation method and application thereof. Background technique [0002] Chitosan (chitosan) is the second largest natural polymer after cellulose, β-(1,4)-2-amino-2-deoxy-D-glucan (glucose) and β-(1,4 )-2-acetylamino-2-deoxy-D-glucan (N-acetylglucosamine), which is obtained by deacetylating chitin under alkaline conditions. Chitosan is rich in sources, low in price, non-toxic, coupled with its excellent anti-oxidation, antibacterial, biocompatibility, biodegradability and other excellent properties, making it a research hotspot, in food, cosmetics, biomedicine and pharmaceuticals and other fields have been widely used. However, chitosan itself has poor water solubility, which seriously limits its processing and application. [0003] In order to improve the application of chitosan in various fields, chitosan needs to be chem...

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
CPCB01J20/24B01J20/28009B01J20/28019C02F1/286C02F2101/20
Inventor 黄俊叶慧谢湉林越呈张祥谢东芳方卉
Owner 杭州丹威生物科技有限公司
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