Preparation method of magnetic adsorption material based on Prussian blue and hydrotalcite

A magnetic adsorption material, Prussian blue technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., can solve problems such as difficult recovery and poor recycling effect, reduce costs, and solve secondary treatment of water bodies The problem, the effect of the simple preparation method

Active Publication Date: 2021-07-23
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The concept of the present invention is such that in view of the shortcomings of traditional adsorption materials that are difficult to recycle and have poor recycling effects, LDHs materials with "memory effect" are selected and grown on magnetic nano-nuclei in situ to achieve preparation under the action of a magnetic field. Under the aim of fast recovery and recyclable adsorbent material

Method used

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  • Preparation method of magnetic adsorption material based on Prussian blue and hydrotalcite
  • Preparation method of magnetic adsorption material based on Prussian blue and hydrotalcite
  • Preparation method of magnetic adsorption material based on Prussian blue and hydrotalcite

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 Synthesis of ZnAl-LDH on the surface of PB, forming Fe after calcination 3 o 4 @ZnAl-LDO magnetic composite material

[0028] The preparation process comprises the following steps:

[0029] a: Disperse 0.3 g of PB in 70 mL of aqueous solution dissolved with zinc chloride, aluminum nitrate, urea, and citric acid, in which the concentration of urea is 0.1 mol L –1 , the concentration of citric acid is 0.02 mol L –1 , the concentration of zinc ions is 0.03 mol L –1 , the concentration of aluminum ions is 0.01 mol L –1 ;

[0030] b: Put in a 100 mL reactor, react at 100°C for 24 h, wash and dry the obtained solid product;

[0031] c: Put the product obtained in step b into a tube furnace with a heating rate of 5°C min –1 , calcined at 400°C for 5 h under nitrogen atmosphere to obtain Fe 3 o 4 @ZnAl-LDO magnetic composite.

Embodiment 2

[0032] Example 2 Synthesis of CoAl-LDH on the surface of PB, forming Fe after calcination 3 o 4 @CoAl-LDO magnetic composite

[0033] The preparation process comprises the following steps:

[0034] a: Take 0.4 g PB and disperse it in 100 mL aqueous solution dissolved with cobalt chloride, aluminum nitrate, urea, and citric acid, and the concentration of urea is 0.4 mol L –1, the concentration of citric acid is 0.08 mo L –1 , the concentration of cobalt ions is 0.02 mo L –1 , the concentration of aluminum ions is 0.08 mol L –1 ;

[0035] b: Put in a 200 mL reactor, react at 110°C for 20 h, wash and dry the obtained solid product;

[0036] c: Put the product obtained in step b into a tube furnace with a heating rate of 2°C min –1 , calcined at 500°C for 5 h under helium atmosphere to obtain Fe 3 o 4 @CoAl-LDO Magnetic Composite.

Embodiment 3

[0037] Example 3 Synthesis of MgAl-LDH on the surface of PB, forming Fe after calcination 3 o 4 @MgAl-LDO magnetic composite material

[0038] The preparation process comprises the following steps:

[0039] a: Disperse 1.0 g of PB in 300 mL of aqueous solution dissolved in magnesium chloride, aluminum nitrate, urea, and citric acid, in which the concentration of urea is 0.8 mol L –1 , the concentration of citric acid is 0.1 mol L –1 , the concentration of magnesium ions is 0.05 mol L –1 , the concentration of aluminum ions is 0.03 mol L –1 ;

[0040] b: Put in a 500 mL reactor, react at 110°C for 20 h, wash and dry the obtained solid product;

[0041] c: Put the product obtained in step b into a tube furnace with a heating rate of 2°C min –1 , calcined at 600°C for 4 h under nitrogen atmosphere to obtain Fe 3 o 4 @MgAl-LDO magnetic composites.

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Abstract

The invention discloses a method for preparing a composite material with a core-shell structure, which is characterized in that ferroferric oxide (Fe3O4) is used as a magnetic core, and layered double-metal oxides (LDOs) are coated outside the magnetic core. The preparation method comprises the following steps: firstly, forming coordination nucleation growth sites of layered double hydroxides (LDHs) on the surface of PB (Prussian blue) by regulating and controlling a solvent environment, enabling the LDHs to grow on the surface of the PB in a coating manner, forming a PB and LDHs core-shell composite material which takes the PB as a core and the LDHs as a shell layer, further carrying out high-temperature treatment, converting the PB into Fe3O4, and dehydrating and converting the LDHs into LDOs, so as to obtain the Fe3O4 and LDOs magnetic adsorption material which takes the Fe3O4 as a magnetic core and the LDOs as the shell layer. The LDOs of a shell layer has good adsorption performance, and Fe3O4 of a core layer has excellent magnetism. Under the action of a magnetic field, the Fe3O4-coated LDOs composite material can be quickly separated from water. The obtained Fe3O4-coated LDOs composite material is of a core-shell structure and can be widely applied to the fields of pollutant adsorption, degradation, photocatalysis and the like.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic nanomaterials, in particular to a kind of Prussian blue coated with hydrotalcite as a precursor, which is obtained through roasting treatment to obtain Fe 3 o 4 The invention relates to a preparation method of a magnetic adsorption material in which the core is the magnetic core and the LDOs are the shell. Background technique [0002] Industrial wastewater often contains high concentrations of organic pollutants, such as dyes, tetracyclines, slick oils, phenolic compounds, etc.) or inorganic pollutants such as heavy metals, fluorides, etc., which are difficult to meet discharge standards through ordinary biological treatment. The commonly used treatment methods are chemical method, ion exchange method and physical adsorption method. Among them, chemical precipitation or oxidation can only treat some wastewater with simple components. The cost of membrane materials in the ion exchange meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/06B01J20/04B01J20/28B01J20/30
CPCB01J20/08B01J20/06B01J20/041B01J20/28009B01J20/3078
Inventor 张瑞康王灿高元哲韩占刚
Owner HEBEI NORMAL UNIV
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