Magnetic citric acid modified chitosan microsphere as well as preparation method and application thereof

A technology of chitosan microspheres and citric acid, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of poor water solubility of chitosan, increased processing cost, and poor adsorption effect, etc. problem, to achieve the effect of improving adsorption performance, high efficiency removal, and increasing water solubility

Active Publication Date: 2020-04-14
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan has poor water solubility and is only soluble in dilute acid solution. Under acidic conditions, the -NH on the C2 position of chitosan 2 Easy to form -NH 3 + , which is not conducive to the adsorption of heavy metals, making the adsorption effect poor and limiting its application
At the same time, only chitosan is used as the heavy metal adsorbent, and the recovery rate of the adsorbent is low, which is not conducive to the repeated use of the adsorbent, which leads to an increase in processing costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] S1: Dissolve 5g polyethylene glycol 4000 in 100mL distilled water, add FeSO at a mass ratio of 1:4 4 ·7H 2 O and Fe 2 (SO 4 ) 3 9H 2 A total of 11.12g of O was fully dissolved. Under the conditions of stirring and 50°C heat preservation, concentrated ammonia water was added dropwise to pH ≥ 10.0, and the aging reaction was continued for 2 hours. After that, it was neutralized with 25% acetic acid by mass percentage to pH = 7.0, separated by magnetic field, and poured. After the upper layer of liquid and scum, wash with distilled water to remove impurities, and then get black and shiny water-based Fe 3 o 4 Nano magnetic materials;

[0035]S2: Accurately weigh 0.5g chitosan, dissolve in 15mL acetic acid solution of 2.5% by mass, accurately weigh 0.5g citric acid and dissolve in 20mL water, adjust pH to 6.5 with 4% NaOH solution, press (chitosan The mass ratio of sugar + citric acid) to carbodiimide = 6:1. Add 0.17 g of carbodiimide, stir for 30 minutes, then add th...

Embodiment 2

[0039] The preparation method and raw materials are the same as in Example 1, except that the amount of citric acid added in step S2 is 1.5 g, and the mass ratio of chitosan to citric acid is 1:3.

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PUM

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Abstract

The invention discloses a preparation method of a magnetic citric acid modified chitosan microsphere. The preparation method comprises the following steps: (1) preparing a water-based Fe3O4 nano magnetic material; (2) preparing citric acid modified chitosan; and (3) preparing the magnetic citric acid modified chitosan microsphere. Chitosan is subjected to citric acid modification, so that chitosanand citric acid are subjected to acylation reaction to form a secondary amide product, and carboxyl groups are introduced, so that the water solubility of chitosan can be improved, and the adsorptionperformance of chitosan to metal ions can also be improved. The prepared magnetic citric acid modified chitosan microsphere can realize high-efficiency removal of Cr (VI) in wastewater, and can alsobe regenerated and recycled.

Description

technical field [0001] The environmental engineering application field of the present invention specifically relates to a magnetic citric acid-modified chitosan microsphere and a preparation method, and the application of the magnetic citric acid-modified chitosan microsphere in adsorbing Cr(VI) in wastewater. Background technique [0002] Water is the source of life and an indispensable natural resource for the survival and development of human beings and all living things. However, in recent years, with the advancement of science and technology and the rapid development of global industry and agriculture, the demand for water is also increasing day by day. Correspondingly, a large amount of waste water is discharged. The increasingly serious problem of water pollution has become one of the important challenges facing human development. . [0003] Chromium is one of the elements that widely exist in nature. Chromium and its compounds are widely used in electroplating, tann...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/24B01J20/28009B01J20/28021C02F1/286C02F2101/22
Inventor 张太亮陈秀丽兰贵红李永久
Owner SOUTHWEST PETROLEUM UNIV
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