Hydrothermal liquid phase preparation method of magnetic kaolinite/chitosan composite

A technology of composite materials and kaolinite, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve problems such as separation and recovery difficulties, and achieve separation and recovery difficulties and good adsorption efficiency , cheap effect

Inactive Publication Date: 2013-03-27
FUQING BRANCH OF FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite material is used for adsorption and magnetic separation research, and has good adsorption capacity; it has high magnetic separation property under magnetic field, which not only maintains the good adsorption efficiency of kaolinite / chitosan, but also improves the repeatability of the adsorbent. Utilization rate; at the same time, it also realizes the immobilization of chitosan, which solves the problem of difficult separation and recovery of kaolinite / chitosan as an adsorbent to a certain extent

Method used

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  • Hydrothermal liquid phase preparation method of magnetic kaolinite/chitosan composite
  • Hydrothermal liquid phase preparation method of magnetic kaolinite/chitosan composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Synthesis of Magnetic Kaolinite

[0019] Add 0.4 g of magnetic ferric oxide suspension directly to a three-necked flask containing 2 g of kaolinite suspension aqueous solution with a mass ratio of 2%, and simultaneously add 80 mL of hydrogen with a mass ratio of 10% (sodium hydroxide / water) Sodium oxide solution, stirred vigorously at room temperature for 3 h, stopped stirring, washed the reaction solution with distilled water until neutral, centrifuged, and separated by suction filtration, dried the filter cake in a vacuum drying oven at 30°C for 12 hours, took it out, and ground To powder, to obtain magnetic kaolinite.

[0020] Preparation of Magnetic Kaolinite / Chitosan Composite

[0021] 2% (acetic acid / water) acetic acid aqueous solution of 2% chitosan was gradually added dropwise at a rate of 1.5 mL / min into a suspension containing 2 g mass ratio of 2% magnetic kaolinite using a constant pressure dropping funnel. solution in a 500 mL three-necked round-bottomed f...

Embodiment 2

[0023] Synthesis of Magnetic Kaolinite

[0024] Add 0.8g of magnetic ferric oxide suspension solution directly into a three-neck flask containing 2 g of kaolinite suspension solution with a mass ratio of 2%, and simultaneously add 80 mL of hydrogen with a mass ratio of 10% (sodium hydroxide / water) Sodium oxide solution, stirred vigorously at room temperature for 3 h, stopped stirring, washed the reaction solution with distilled water until neutral, centrifuged, and separated by suction filtration, dried the filter cake in a vacuum drying oven at 30°C for 12 hours, took it out, and ground To powder, to obtain magnetic kaolinite.

[0025] Preparation of Magnetic Kaolinite / Chitosan Composite

[0026] 2% (acetic acid / water) acetic acid aqueous solution of 2% chitosan was gradually added dropwise at a rate of 1.5 mL / min into a suspension containing 2 g mass ratio of 2% magnetic kaolinite using a constant pressure dropping funnel. solution in a 500 mL three-necked round-bottomed f...

Embodiment 3

[0028] Synthesis of Magnetic Kaolinite

[0029] Add 1.2 g of magnetic ferric oxide suspension directly into a three-necked flask containing 2 g of kaolinite suspension with a mass ratio of 2%, and simultaneously add 80 mL of hydrogen with a mass ratio of 10% (sodium hydroxide / water) Sodium oxide solution, stirred vigorously at room temperature for 3 h, stopped stirring, washed the reaction solution with distilled water until neutral, centrifuged, and separated by suction filtration, dried the filter cake in a vacuum drying oven at 30°C for 12 hours, took it out, and ground To powder, to obtain magnetic kaolinite.

[0030] Preparation of Magnetic Kaolinite / Chitosan Composite

[0031] A 2% (acetic acid / water) acetic acid aqueous solution of 2% chitosan was gradually added dropwise at a rate of 1.5 mL / min into a suspension containing 2 g of 2% magnetic kaolinite using a constant pressure dropping funnel. solution in a 500 mL three-necked round-bottomed flask, stirred at 36°C fo...

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Abstract

The invention discloses a hydrothermal liquid phase preparation method of a magnetic kaolinite / chitosan composite which is prepared by adopting the hydrothermal liquid phase preparation method. The magnetic kaolinite / chitosan composite is prepared at a normal temperature; the preparation method has the advantages of mild reaction conditions, simple process, easiness in control of a preparation process and low price; and the magnetic kaolinite / chitosan composite has the characteristics of good crystallinity and high purity, and has an average particle size of 22.5nm. Kaolinite successfully loads nano ferroferric oxide and chitosan particles. The magnetic kaolinite / chitosan composite is used in absorption and magnetic separation research, has a good absorption capacity, has a high magnetic separability under a magnetic field, maintains good absorption efficiency of kaolinite / chitosan, is increased in repeating utilization factor of an absorbing agent, and realizes immobilization of the chitosan. The problem of difficulty in separation and recycling of the kaolinite / chitosan as the absorbing agent is solved to a certain extent.

Description

technical field [0001] The invention belongs to the field of magnetic clay composite adsorption materials, and in particular relates to a hydrothermal liquid phase preparation method of magnetic kaolinite / chitosan composite materials. Background technique [0002] Kaolinite belongs to the kaolinite subfamily, which is a typical 1:1 type dioctahedral layered silicate. The basic crystal layer unit of kaolinite is composed of a layer of silicon-oxygen tetrahedron [SiO 4 ] and a layer of alumina octahedra [AlO 2 (OH) 4 ] are connected by a common oxygen, the oxygen atoms in the tetrahedron of each crystal layer unit form hydrogen bonds with the octahedral hydroxyl groups of the adjacent crystal layer units, and the unit layers are connected by hydrogen bonds and van der Waals forces. The characteristics determine that it has expandability and large internal and external areas in the direction of the vertical layer, so that it has a large layer spacing, so it has a certain deg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
Inventor 李世迁陈盛陈玉成叶瑞洪
Owner FUQING BRANCH OF FUJIAN NORMAL UNIV
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