Method for preparing crystalline-state mesoporous CoFe204 with large specific surface area

A technology with large specific surface area and crystalline state, which is applied in the field of preparation of mesoporous CoFe2O4, can solve the problem of few binary or multi-component mesoporous metal oxides, achieve simple impregnation method and strategy, reduce pore structure collapse, and large specific surface area Effect

Inactive Publication Date: 2010-06-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Claims
  • Application Information

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Problems solved by technology

However, so far, the research on mesoporous metal oxides is mainly limited to single metal

Method used

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  • Method for preparing crystalline-state mesoporous CoFe204 with large specific surface area
  • Method for preparing crystalline-state mesoporous CoFe204 with large specific surface area
  • Method for preparing crystalline-state mesoporous CoFe204 with large specific surface area

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[0026] Example 1: Mesoporous CoFe 2 o 4 - Preparation of SBA

[0027] 1) According to the literature (Zhao, D.Y.et al..Science, 1998, 279:548), first prepare the mesoporous silica template SBA-15, the process is: in a 40°C constant temperature water bath, 2g triblock copolymer P123 ((EO) 20 (PO) 70 (EO) 20 ) was added to 80mL 2M HCl, and continued strong magnetic stirring until completely dissolved, then added 4.25g ethyl orthosilicate, and continued to stir for 24h. Transfer the resulting mixture to an autoclave, seal it and put it in a thermostat at 100°C for hydrothermal treatment for 24 hours. After filtering and washing, dry it at 80-100°C for 24 hours, and then dry it at 1°C / min under air atmosphere. Raise the temperature to 500°C and keep it at this temperature for 3-5h to obtain a large specific surface area (580.06m 2 / g), large pore volume (1.0193m 3 / g) two-dimensional hexagonal mesoporous silica powder SBA-15. From the TEM images ( figure 1 (a)) It can be ...

Example Embodiment

[0032] Example 2: Mesoporous CoFe 2 o 4 - Preparation of KIT

[0033]1) According to the literature (Kim, T.W.et al.J.Am.Chem.Soc., 2005, 127, 7601), the mesoporous silica template KIT-6 was first prepared, and the process was as follows: in a constant temperature water bath at 35°C, 4g triblock copolymer P123 ((EO) 20 (PO) 70 (EO) 20 ) was added to a solution of 144g distilled water and 7.73g 37wt% HCl, completely dissolved under continuous strong magnetic stirring, then 4.0g n-butanol was added, after stirring for 1h, 8.6g ethyl orthosilicate was added, and stirring was continued for 24h. Transfer the resulting mixture to an autoclave, seal it and place it in a thermostat at 100°C for hydrothermal treatment for 24 hours, filter and dry at 100°C for 24 hours, wash with distilled water and acidified ethanol, and then place it in an air atmosphere at 1°C Raise the temperature to 550°C at the rate of / min, and keep it at this temperature for 3-5h, that is, a large specific ...

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Abstract

The invention discloses a method for preparing crystalline-state mesoporous CoFe204 with large specific surface area, comprising the following specific steps of: firstly, synthesizing hard template agent mesoporous silicon oxide powder SBA-15 or KIT-6; dipping the silicon oxide powder in 0.5-1M of mixed ethanol solution of Co(NO3)2.6H2O and Fe(NO3)3.9H2O, wherein the ratio of Co<2+> and Fe<3+> is 1:2, stirring the solution at a room temperature for 5 to 20h, drying, raising the temperature to 250 DEG C at a speed of 1 DEG C/min, and keeping warm for 3-6h at the temperature; repeatedly dipping the powder in the metal precursor solution and raising the temperature to 600 DEG C at the same speed, keeping warm for 6h at the temperature; removing silicon oxide template with 2M hot NaOH, washing and drying to obtain the needed products. The invention is simple in device, is easy to operate and environment friendly and has university.

Description

technical field [0001] The invention relates to a mesoporous CoFe 2 o 4 The preparation method belongs to the field of inorganic nanometer material synthesis. Background technique [0002] Spinel ferrite has remarkable optical, electrical, and magnetic properties. As a non-metallic magnetic material, it has various properties such as soft magnetic, hard magnetic, moment magnetic, and piezo magnetic, and has been widely used in electronics. Components, telecommunication devices, radar, magnetic recording materials, communications, navigation, and electronic computers, automatic control, catalysis and other fields. Of which CoFe 2 o 4 It has been widely concerned because of its excellent properties such as large magnetocrystalline anisotropy, mild saturation magnetization, good chemical and mechanical stability, etc. [0003] With the development of nanotechnology, nanomaterials have opened up new fields of application that conventional materials cannot achieve due to the...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/26
Inventor 姬广斌孙艳艳郑明波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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