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Method for preparing spinel type iron-containing oxide nano-materials by low heat solid state reaction

A spinel-type, nano-material technology, applied in the direction of nickel oxide/nickel hydroxide, cobalt oxide/cobalt hydroxide, iron oxide/iron hydroxide, etc., can solve problems such as performance changes, and achieve easy realization and operation of the reaction Simple, easy-to-promote effects

Inactive Publication Date: 2009-10-14
李峰 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the shape and size of nanomaterials may also lead to drastic changes in their properties

Method used

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  • Method for preparing spinel type iron-containing oxide nano-materials by low heat solid state reaction
  • Method for preparing spinel type iron-containing oxide nano-materials by low heat solid state reaction
  • Method for preparing spinel type iron-containing oxide nano-materials by low heat solid state reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: spinel-type CoFe 2 o 4 Synthesis of Nanoparticles

[0037] Specific steps are as follows:

[0038] 1. Add 0.02 mol FeCl 3 ·6H 2 O and 0.01 mol CoCl 2 ·6H 2 Add O to a mortar or ball mill, and then add concentrated hydrochloric acid at 0.5% of the mass of the inorganic salt.

[0039] 2. After vigorously grinding for 0.5 hours, an orange-yellow paste composite metal salt precursor was obtained, which was dried for later use or directly applied to the preparation of nanomaterials in step 3.

[0040] 3. Add solid NaOH (0.08 mol) to the mortar or ball mill containing the composite metal salt precursor in step 2, and the exothermic reaction will occur immediately accompanied by the release of water vapor from the reactor. Milling was continued for 0.5 hour until the reaction was complete.

[0041] 4. The obtained black paste was washed with water, centrifuged and dried to obtain a black solid product.

[0042] 5. The product can be dispersed in water.

[...

Embodiment 2

[0044] Embodiment 2: As described in Embodiment 1, the difference is:

[0045] No mineral acid was added in step 1. CoFe obtained from the reaction 2 o 4 Nanoparticles are similar in appearance to the nanoparticles obtained in Example 1 (see attached figure 2 ). However, there are impurities in the product.

Embodiment 3

[0046] Embodiment 3: As described in Embodiment 1, the difference is:

[0047] Add KOH, NaHCO in step 3 3 or Na 2 CO 3 to replace NaOH. CoFe obtained from the reaction 2 o 4 The nanoparticles were similar to those obtained in Example 1.

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Abstract

The invention relates to a method for preparing spinel type iron-containing oxide nano-materials by low heat solid state reaction. The method adds trivalent iron salt and one or more divalent metal salts into a mortar according to the proportioning by weight of 2: 1, then adds inorganic acid according to 0-5 percent of the weight of inorganic salt, grinds for 10 minutes-1 hour, then obtains a precursor of paste compound metal salt, adds a solid base, the exothermic reaction which is often accompanied by releasing water vapor from the reaction is carried out immediately, continues the grinding for 10 minutes-1 hour till the reaction is completed, adds water for washing, separates centrifugally and dries to obtain the deep color spinel type iron oxide-containing nano-materials with different sizes and shapes. As the reaction is carried out in the absence of solvent at room temperature or low temperature, in the method, the solvent does not need to be recycled or processed, ,thereby having low energy consumption and being conductive to environmental protection; the operation is simple, the reaction is easy to realize; the method can be used for large-scale industrial production, thereby facilitating the promotion; and the method has no organic solvent participating in the reaction, thereby being a relatively green chemical process technology.

Description

technical field [0001] The invention relates to a preparation method of a nano-spinel type iron-containing oxide with controllable appearance and structure. Specifically, it relates to a method for preparing nano-spinel oxides with controllable morphology and structure by solid-state reaction at low heat. Background technique [0002] Spinel-type iron-containing oxide is a non-toxic inorganic material. For example: due to most of them having excellent magnetic properties and biocompatibility, spinel-type iron-containing oxides can be used to make gas sensors, magnetic storage devices, high-efficiency catalysts, high-efficiency water cleaners, etc. [See: 1.N.Z.Bao, L.M.Shen, Y.H.Wang, P.Padhan, A.Gupta, Journal of the American Chemical Society 129, 12374 (OCT 17, 2007); 2.Q.Chen, Z.J.Zhang, Applied Physics Letters 73, 3156 (NOV 23, 1998 ); 3.T.Hyeon et al., Journal of Physical Chemistry B 106, 6831 (JUL 11, 2002); 4.E.Kang et al., Journal of Physical Chemistry B 108, 13932 ...

Claims

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Application Information

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IPC IPC(8): C01G49/02C01G51/04C01G53/04
Inventor 李峰陈丽英忻新泉
Owner 李峰
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