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Porous magnetic ferrite and its preparation method

A magnetic ferrite, porous technology, applied in the direction of inorganic material magnetism, chemical instruments and methods, ceramic products, etc., can solve the problems of large average pore size, large total pore volume, large specific surface area, etc. Large surface area and uniform dispersion

Inactive Publication Date: 2006-01-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of porous spinel ferrite with large specific surface area, coexistence of mesopores and micropores, large average pore diameter and large total pore volume by layered precursor method has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A. Ni(NO 3 ) 2 , Zn(NO 3 ) 2 And Fe(NO 3 ) 3 Join through N 2 Prepare a mixed salt solution in deionized water so that the concentration of metal ions in the solution is Ni 2+ :0.05M, Zn 2+ : 0.55M, Fe 3+ :0.2M; Pour this mixed solution into the container; prepare NaOH and NaCO 3 The mixed alkali solution to make the NaOH concentration in the alkali solution 1.5M, NaCO 3 The concentration is 0.8M.

[0028] B. Slowly add the mixed alkali solution dropwise to the container containing the mixed salt solution. When the pH value in the system reaches 8, stop the dropwise addition of the alkali solution. Crystallize in a water bath at 40°C for 10 hours, then filter with suction, wash with ice water passing through nitrogen, and then wash twice with ethanol at 0°C, and dry to obtain Ni 2+ -Zn 2+ -Fe 3+ -CO 3 2- Type layered double hydroxyhydroxide hydrotalcite (LDHs).

[0029] C. Put the LDHs in a muffle furnace, heat up to 700°C at a rate of 2°C / min, keep it for 4h, and cool to ...

Embodiment 2

[0033] A. Put NiSO 4 , ZnSO 4 And Fe 2 (SO 4 ) 3 Join through N 2 Prepare a mixed salt solution in deionized water so that the concentration of metal ions in the solution is Ni 2+ : 0.06M, Zn 2+ : 0.8M, Fe 3+ :0.2M; Pour the mixed solution into the container; prepare NaOH solution so that the concentration of NaOH in the alkali solution is 2.0M.

[0034] B. Slowly add the alkali solution dropwise to the container containing the mixed salt solution. When the pH value in the system reaches 7.5, stop the dropwise addition of the alkali solution. Crystallize in a water bath at 40°C for 10 hours, then filter with suction, wash with ice water passing through nitrogen, and then wash twice with ethanol at 0°C, and dry to obtain Ni 2+ -Zn 2+ -Fe 3+ -SO 4 2- Type layered double hydroxyhydroxide hydrotalcite (LDHs).

[0035] C. Put the LDHs in a muffle furnace, heat up to 900°C at a rate of 10°C / min, calcinate for 7 hours, and cool to room temperature to obtain Ni X Zn 1-X Fe 2 O 4 A mixtur...

Embodiment 3

[0039] A. CoSO 4 , ZnSO 4 And Fe 2 (SO 4 ) 3 Join through N 2 Prepare a mixed salt solution in deionized water so that the concentration of metal ions in the solution is Co 2+ : 0.10M, Zn 2+ : 0.7M, Fe 3+ :0.40M; Pour the mixed solution into the container; prepare the NaOH solution so that the NaOH concentration in the alkali solution is 2.4M.

[0040] B. Slowly add the alkali solution dropwise to the container containing the mixed salt solution. When the pH value in the system reaches 7.0, stop the dropwise addition of the alkali solution. In a water bath at 50℃, crystallize for 8h, and obtain Ni in step B of Example 1 2+ -Zn 2+ -Fe 3+ -SO 4 2- Type layered double hydroxyhydroxide hydrotalcite (LDHs).

[0041] C. Put the LDHs in a muffle furnace, and heat up to 700°C at a rate of 15°C / min, and keep it for 6 hours. Naturally cool to room temperature to get Co X Zn 1-X Fe 2 O 4 A mixture of ferrite and ZnO.

[0042] D. Same as step D of Example 1 to obtain porous magnetic ferrite....

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Abstract

A porous magnetic ferrite MxMT(1-x) Fe2O4 or MMT(y)Fe(2-Y) O4 with large specific surface area and pore volume, low granularity and high magnetism is prepared through introducing MT to laminated hydrotalcite, high-temp calcining, and removing template agent MTO or MT2D3 by concentrated alkali solution.

Description

Technical field: [0001] The invention relates to a porous magnetic ferrite and a preparation method thereof. technical background: [0002] Porous materials are used in highly selective catalysts and catalyst carriers, high-efficiency adsorbents, and high-performance gas-liquid chromatography column materials due to their porosity and uniformity of pore size, large specific surface area, high temperature resistance, weather resistance, and corrosion resistance. , High-strength lightweight structural materials, special battery materials, new composite materials and other fields have potential application prospects. It has been proposed that this material can be used for research on the diffusion and adsorption of substances in a limited space, and even used as an embedding material for drug release, a carrier for enzymes or proteins, and for the treatment of radioactive waste. [0003] Ferrite is a new type of non-metallic magnetic material, which is widely used in high-frequency ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B38/04H01F1/34
CPCC04B2235/443C04B2235/3284C04B2235/3279C04B38/04C04B35/265C01G49/0018
Inventor 段雪李峰杨巧珍
Owner BEIJING UNIV OF CHEM TECH
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