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Magnetic ferrocobalt ferrite prepared by hard formwork method and preparation method thereof

A hard template method and ferrite technology, which is applied in the field of new cobalt iron ferrite and its preparation, achieves the effect of low equipment requirements, high safety, and good ultraviolet light degradation performance

Inactive Publication Date: 2009-01-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After literature and patent inquiries, this method has not been reported

Method used

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  • Magnetic ferrocobalt ferrite prepared by hard formwork method and preparation method thereof
  • Magnetic ferrocobalt ferrite prepared by hard formwork method and preparation method thereof
  • Magnetic ferrocobalt ferrite prepared by hard formwork method and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A. 3.9 grams of Co(NO 3 ) 2 ·6H 2 O, 4.6 g FeSO 4 ·7H 2 O and 2.6 g Fe 2 (SO 4 ) 3 Put into 50.0 ml of high-quality wood pulp with a concentration of 1.0% and stir until the solid mixture is fully dissolved.

[0035] B. Separately prepare 1.5M NaOH and 1.0M NaOH with deoxygenated deionized water 2 CO 3 50.0 ml of the mixed alkali solution, and under nitrogen protection and vigorous stirring, slowly add the alkali solution dropwise to the above salt solution until the pH ≈ 10.5, then continue to stir for 6.0 hours, stand at room temperature for 16.0 hours to crystallize, and filter , washed three times with deionized water and absolute ethanol, respectively. The solid matter is dried in vacuum to obtain the cobalt-iron-iron hydrotalcite / paper fiber adsorption assembly.

[0036] C. Place the adsorption assembly in a muffle furnace, raise the temperature of the muffle furnace to 1100° C. at a heating rate of 5.0° C. / min, and keep it warm for 2 hours to obtain cob...

Embodiment 2

[0040] A. Weigh 4.1 grams of Co(NO 3 ) 2 ·6H 2 O, 3.9 g FeSO 4 ·7H 2 O and 2.8 g Fe 2 (SO 4 ) 3 Put into 50.0 ml of high-quality wood pulp with a concentration of 1.0% and stir until the solid mixture is fully dissolved. Separately prepare 2.5M NaOH and 1.8 M NaOH with deoxygenated deionized water 2 CO 3 50.0 ml of the mixed alkali solution, under the protection of nitrogen and vigorous stirring, the mixed alkali solution was slowly added dropwise to the above-mentioned three-necked flask containing the salt solution until the pH ≈ 10.5, and then continued to stir for 6.0 hours.

[0041] B. After the stirring is completed, the product is allowed to stand for crystallization at room temperature for 16.0 hours.

[0042] C. Filter the above mixture, and wash with deionized water and absolute ethanol for 3 times successively.

[0043] D, vacuum drying the solid matter to obtain Co 2+ Fe 2+ Fe 3+ - LDH / paper fiber adsorption assembly.

[0044] E. Place the adsorption ...

Embodiment 3

[0047] A. Weigh 5.8 grams of Co(NO 3 ) 2 ·6H 2 O, 5.6 g FeSO 4 ·7H 2 O and 8.1 g Fe 2 (SO 4 ) 3 Put into 50.0 ml of high-quality wood pulp with a concentration of 1.0% and stir until the solid mixture is fully dissolved. Separately prepare 2.5M NaOH and 2.0M NaOH with deoxygenated deionized water 2 CO 3 50.0 ml of the mixed alkali solution, under the protection of nitrogen and vigorous stirring, the mixed alkali solution was slowly added dropwise to the above-mentioned three-necked flask containing the salt solution until the pH ≈ 10.5, and then continued to stir for 6.0 hours.

[0048] B. After the stirring is completed, the product is allowed to stand for crystallization at room temperature for 16.0 hours.

[0049] C. Filter the above mixture, and wash with deionized water and absolute ethanol for 3 times successively.

[0050] D. Vacuum dry the solid matter to obtain Co 2+ Fe 2+ Fe 3+ - LDH / paper fiber adsorption assembly.

[0051] E. Place the adsorption asse...

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Abstract

The invention provides a magnetic cobalt iron ferrite prepared by a hard template method and a method for preparing the same. The adopted preparation method comprises the following steps: paper fibre or porous organism is used as a hard template; Co<2+>Fe<2+>Fe<3+>-LDH is synthesized in the surface and holes of the hard template and roasted to prepare the magnetic cobalt iron ferrite; as the function for fixing the houghite position is produced by the obstruction and adsorption of the hard template, the occurrence of the sintering phenomenon is greatly avoided, thereby preparing the magnetic cobalt iron ferrite with a consistent shape and even granularity. The method can be used to prepare the tubular or granular magnetic cobalt iron ferrite; the saturated magnetization intensity is 69-72Delta / emu.g<-1>, wherein the tubular magnetic cobalt iron ferrite has the tube diameter of between 0.3 and 1.0 micron, the tube length of between 0.8 and 1.5 micron and even distribution; and the granular magnetic cobalt iron ferrite has the grain diameter of between 50 and 80 nanometers and even distribution. The provided preparation method has the characteristics of simple operation, simple process, low requirement to equipment, high safety, etc.

Description

technical field [0001] The invention relates to a novel cobalt-iron ferrite and a preparation method thereof, in particular to cobalt-iron ferrite with special shapes such as micron magnetic tubes and nanoparticles and a preparation method thereof. The prepared cobalt-iron-ferrite nanoparticles have good ultraviolet light degradation performance on the organic dye methyl orange. Background technique [0002] Spinel Type Composite Metal Oxide AB 2 o 4 It is an important class of inorganic non-metallic materials. It has high melting point, high mechanical strength, low dielectric constant and excellent optical properties. AB 2 o 4 The successful preparation of particles has further broadened the application prospects of this type of material. [0003] Usually, the preparation methods of spinel type composite metal oxide mainly include the following types: [0004] a. Chemical coprecipitation-roasting method. This method is a traditional preparation method, and the targe...

Claims

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Application Information

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IPC IPC(8): H01F1/10C04B35/26C04B35/64
Inventor 徐庆红纪雪梅马吉山
Owner BEIJING UNIV OF CHEM TECH
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