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Preparation method of magnetic chitosan compound adsorbent

A magnetic adsorbent and composite adsorption technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problems of easy aggregation of nanoparticles, increase in particle size, and easy corrosion by the external environment, etc. Achieve the effects of avoiding magnetic nucleus agglomeration, improving stability, and excellent selective adsorption performance

Inactive Publication Date: 2017-02-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But purely magnetic Fe 3 o 4 Nanoparticles are easy to agglomerate, which increases the particle size and is easily corroded by the external environment, which limits its wide application.

Method used

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  • Preparation method of magnetic chitosan compound adsorbent
  • Preparation method of magnetic chitosan compound adsorbent
  • Preparation method of magnetic chitosan compound adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Spherical magnetic core Fe 3 o 4 Preparation of:

[0034] First weigh 2.5g FeCl successively at room temperature 3 ·6H 2 O, 4g NaAc and 1g polyethylene glycol 2000, and then dissolved in 60ml of ethylene glycol, stirred magnetically until a brownish yellow solution was formed, transferred the obtained solution to a 100ml hydrothermal kettle, and reacted at 200°C for 24h; After cooling to room temperature, the black suspension was washed three times with deionized water and absolute ethanol, and the black solid was separated by a permanent magnet, and then dried in vacuum at 60°C for 12 hours to obtain a spherical magnetic core Fe 3 o 4 .

[0035] (2) Composite magnetic carrier Fe 3 o 4 @Al 2 o 3 Preparation of:

[0036] Sonicate in a water bath for 15 minutes, and place 0.2 g of spherical magnetic core Fe at room temperature 3 o 4 Evenly disperse in 120ml, 0.05mol / L ethanol solution of aluminum isopropoxide, add 60ml ethanol solution with absolute ethano...

Embodiment 2

[0042] (1) Preparation of spherical magnetic core

[0043] Magnetic core Fe 3 o 4 The preparation steps are the same as in Example 1.

[0044] (2) Preparation of Composite Magnetic Carrier

[0045] Sonicate in a water bath for 15 minutes, and place 0.2 g of spherical magnetic core Fe at room temperature 3 o 4 Evenly disperse in 120ml, 0.033mol / L ethanol solution of aluminum isopropoxide, add 60ml of ethanol solution with a volume ratio of absolute ethanol and deionized water of 5:1, and then magnetically stir for 6h to hydrolyze aluminum isopropoxide into Pseudoboehmite and coated in the magnetic core Fe 3 o 4 The surface was washed three times with deionized water and absolute ethanol, and dried under vacuum at 60°C for 12 hours. 2 After calcination at 500°C for 4 hours under the protection of atmosphere, the magnetic carrier Fe 3 o 4 @Al 2 o 3 .

[0046] (3) Preparation of chitosan-coated magnetic adsorbent

[0047] First, 2g of thiourea and 6ml of 25wt% glutarald...

Embodiment 3

[0050] (1) Preparation of spherical magnetic core

[0051] Magnetic core Fe 3 o 4 The preparation steps are the same as in Example 1.

[0052] (2) Preparation of Composite Magnetic Carrier

[0053] Sonicate in a water bath for 15 minutes, and place 0.2 g of spherical magnetic core Fe at room temperature 3 o 4 Uniformly disperse in 120ml, 0.066mol / L ethanol solution of aluminum isopropoxide, add absolute ethanol and deionized water volume ratio of 5:1 60ml ethanol solution, and then magnetically stir for 6h to hydrolyze aluminum isopropoxide into Pseudoboehmite and coated in the magnetic core Fe 3 o 4 The surface was washed three times with deionized water and absolute ethanol, and dried under vacuum at 60°C for 12 hours. 2 After calcination at 500°C for 4 hours under the protection of atmosphere, the magnetic carrier Fe 3 o 4 @Al 2 o 3 .

[0054] (3) Preparation of chitosan-coated magnetic adsorbent

[0055] First, 2g of thiourea and 6ml, 25wt% of glutaraldehyde s...

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Abstract

The invention discloses a preparation method of a magnetic chitosan compound adsorbent. The preparation method comprises: preparing a compound magnetic carrier Fe3O4@Al2O3 and carrying out chitosan coating on the compound magnetic carrier Fe3O4@Al2O3; meanwhile, carrying out glutaraldehyde cross-linking and thiourea modification on chitosan to prepare the magnetic adsorbent Fe3O4@Al2O3-CS. When the adsorbent is used for adsorbing Cr(VI), the concentration of a Cr(VI) solution is 0.5mg / L to 100mg / L and the pH (Potential of Hydrogen) value is 1 to 3. The adsorbent prepared by the invention has common properties of a magnetic core (with a rapid magnetic separation function) and the chitosan (with abundant surface functional groups), and has relatively good cyclic regeneration and adsorption performances on the Cr(VI); the adsorbent also has excellent selective adsorption performances on the Cr(VI) in a mixed cation solution containing the Cr(VI), Cu(II), Zn(II), Mg(II), Cd(II) and Ni(II).

Description

technical field [0001] The invention belongs to the field of preparation and application of high-performance magnetic materials, and in particular provides a preparation method of a magnetic chitosan composite adsorbent suitable for adsorption of Cr(VI) in waste water. Background technique [0002] Cr(VI) can cause gene mutation and induce cancer, and its sources mainly include metal electrolysis and electroplating processing, leather tanning, printing and dyeing and other industries. There have been many serious chromium pollution incidents, including the chromium pollution incidents in Tokyo, Japan and New Jersey, USA in the 1970s; in addition, a large area of ​​chromium pollution incidents also occurred in Jinzhou, my country. my country stipulates that the maximum allowable discharge standard of chromium and its compounds in industrial wastewater is 0.5mg / L. Wastewater polluted by Cr(VI) must be treated before discharge, and the main treatment technologies include ion e...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/24B01J20/28009B01J2220/4825C02F1/286C02F2101/22C02F2303/16
Inventor 蔡卫权朱峰
Owner WUHAN UNIV OF TECH
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