Preparation method of zinc ferrite nano-material

A nanomaterial, zinc ferrite technology, applied in the field of preparation of zinc ferrite nanomaterials, can solve the problems of poor selectivity of gas-sensing materials, high working temperature, easy phase transition, etc., and achieves good sensitivity, easy availability of raw materials, Simple preparation method

Inactive Publication Date: 2017-11-21
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they also have various disadvantages more or less, such as SnO 2 The selectivity of gas-sensitive materials is poor; the working temperature of ZnO is high (400-450°C); γ-Fe 2 o 3 Unstable, prone to phase transition, etc.

Method used

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  • Preparation method of zinc ferrite nano-material
  • Preparation method of zinc ferrite nano-material
  • Preparation method of zinc ferrite nano-material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of Fe III -MOF-5 nanomaterials

[0021] Zinc nitrate hexahydrate (19.2 mg), iron acetylacetonate (29 mg), terephthalic acid (4.8 mg), polyvinylpyrrolidone (96 mg) were dissolved in a mixed solution of N,N-dimethylacetamide and ethanol (12.8 mL, V / V=5:3). The above mixture was stirred at room temperature for 10 minutes, then the obtained suspension was transferred into a 20mL reaction kettle and heated at 100°C for 24h, the obtained product was centrifuged with DMF and ethanol successively, and then dried in a vacuum oven at 60°C for 6h. Get the precursor Fe Ⅲ -MOF-5 nanomaterials.

Embodiment 2

[0023] Preparation of Fe III -MOF-5 nanomaterials

[0024] Dissolve zinc nitrate hexahydrate (23.2mg), iron acetylacetonate (30mg), terephthalic acid (5mg), polyvinylpyrrolidone (100mg) in a mixed solution of N,N-dimethylformamide and ethanol (12.8mL , V / V=5:3). The above mixture was stirred at room temperature for 10 minutes, then the obtained suspension was transferred into a 20mL reaction kettle and heated at 140°C for 12h, and the obtained product was centrifuged with DMF and ethanol successively and dried in a vacuum oven at 80°C for 10h. Get the precursor Fe III -MOF-5 nanomaterials.

[0025] The structure was confirmed by X-ray powder diffractometer analysis, such as figure 1 The resulting precursor Fe III -MOF-5 nanomaterials have no obvious diffraction peaks, indicating that they are amorphous.

[0026] The obtained Fe was characterized by scanning electron microscopy III - Morphology of MOF-5 nanomaterials. Such as figure 2 As shown, the resulting Fe III -...

Embodiment 3

[0028] Preparation of ZnFe 2 o 4 nanomaterials

[0029] Fe in embodiment 1 or embodiment 2 III - MOF-5 nanomaterials (20 mg) were weighed into a crucible, placed in a muffle furnace, and calcined at a high temperature in an air atmosphere. The calcination temperature is 450°C, the heating rate is 1°C / min, and the calcination time is 2h.

[0030] The structure was confirmed by X-ray powder diffractometer analysis, such as image 3 The nanomaterial shown is a spinel-structured ZnFe 2 o 4 nanomaterials.

[0031] The obtained ZnFe was characterized by scanning electron microscope 2 o 4 Morphology of nanomaterials. Such as Figure 4 As shown, the resulting ZnFe 2 o 4 Nanomaterials have an octahedral structure and a rough surface.

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Abstract

The invention discloses a preparation method of a zinc ferrite nano-material and belongs to the technical field of nano-material preparation. The ZnFe2O4 nano-material is prepared in the way that a solvothermal method is adopted to prepare a metal-organic precursor material, and then a high-temperature calcining method is adopted for treatment. The zinc ferrite nano-material is prepared by the following steps: zinc nitrate hexahydrate, ferric acetylacetonate, terephthalic acid and polyvinylpyrrolidone are dissolved in a N,N-dimethylacetamide and ethyl alcohol mixed solution; stirring is performed at the room temperature, an obtained turbid liquid is transferred into a reaction kettle, heating is performed under a certain temperature condition, and centrifugal separation and vacuum drying are performed to obtain a precursor Fe III-MOF-5 nano-material; and high-temperature calcination is performed at a certain temperature to obtain the ZnFe2O4 nano-material. The preparation method is simple, green, pollution-free and high in degree of practicability, and the prepared ZnFe2O4 nano-material can directly serve as a gas-sensitive material for use.

Description

technical field [0001] The invention relates to a method for preparing zinc ferrite nanomaterials, belonging to the technical field of nanomaterial preparation. Background technique [0002] In recent years, people pay more and more attention to their own safety and health. Therefore, the demand for monitoring toxic and harmful gases is also increasing. Because metal oxide gas sensors have the advantages of high sensitivity, simple structure, low price, and easy productization, the research on metal oxide gas sensors is quite extensive. Various traditional metal oxide gas sensing materials, such as SnO 2 , Fe 2 o 3 , ZnO, etc. have been studied for a period of time and have achieved certain results. However, they also have various disadvantages more or less, such as SnO 2 The selectivity of gas-sensitive materials is poor; the working temperature of ZnO is high (400-450°C); γ-Fe 2 o 3 Unstable, prone to phase change, etc. In order to improve the gas-sensing performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00G01N27/12
CPCC01G49/0081C01P2002/72C01P2004/03C01P2004/41C01P2004/62G01N27/127
Inventor 宋学志孙菲菲王小风谭振权孙凯铭
Owner DALIAN UNIV OF TECH
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