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A layered α-fe with enhanced absorption by visible light 2 o 3 The preparation method of nano round cake

A visible light and layered technology, applied in the direction of nanotechnology, iron oxide/iron hydroxide, iron oxide, etc., can solve the problems of inconvenient washing of the final product, complex operation of the template method and the precursor method, etc., and achieve enhanced visible light absorption characteristics, The effect of simple preparation method and simple operation

Active Publication Date: 2020-01-31
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the hydrothermal methods introduce various organic surfactants, which will bring inconvenience to the washing of the final product
Template method and precursor method are more complicated to operate

Method used

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  • A layered α-fe with enhanced absorption by visible light <sub>2</sub> o <sub>3</sub> The preparation method of nano round cake
  • A layered α-fe with enhanced absorption by visible light <sub>2</sub> o <sub>3</sub> The preparation method of nano round cake
  • A layered α-fe with enhanced absorption by visible light <sub>2</sub> o <sub>3</sub> The preparation method of nano round cake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Layered α-Fe with enhanced visible light absorption 2 O 3 Preparation of nano discs

[0024] Layered α-Fe with enhanced visible light absorption 2 O 3 The preparation method of nano disc, the steps are as follows:

[0025] 1) At room temperature, add 0.5g of FeCl 2 .4H 2 O, 25mL of pyridine and 1mL of water are stirred and mixed;

[0026] 2), FeCl 2 .4H 2 The O-pyridine-water mixture is transferred to the reaction kettle, and the layered α-Fe is obtained by solvothermal method at 170℃ for 16h 2 O 3 Nano pie.

[0027] α-Fe 2 O 3 Analysis of formation process in pyridine-water system:

[0028] α-Fe 2 O 3 The formation of can be seen in the following three processes, which can be represented by reaction formulas (1), (2) and (3) respectively. At room temperature, FeCl 2 .4H 2 O will rapidly react with the pyridine-water system in the air to produce yellow α-FeOOH (see reaction equations (1) and (2)); in the solvothermal reaction, α-FeOOH can be dehydrated in the pyridine...

Embodiment 2

[0033] Example 2: The effect of the type of iron salt on the final product.

[0034] Multi-layer pie-shaped α-Fe 2 O 3 The formation of is related to the type of iron salt.

[0035] Under the premise that other experimental conditions are exactly the same, FeCl is used 3 .6H 2 O and FeSO 4 .7H 2 In the case of O two iron sources, the obtained is irregular α-Fe 2 O 3 Nano particles (respectively as image 3 a and image 3 b). Alkaloid pyridine can interact with Fe 2+ And Fe 3 + Forms Fe(OH) 2 Or α-FeOOH and Fe(OH) 3 The precursor of hydrated iron oxide precipitation, these hydrated iron oxides can obtain α-Fe through subsequent dehydration reaction 2 O 3 product. However, only through FeCl 2 .4H 2 O in pyridine-H 2 The α-FeOOH formed in the O system can form cake-like α-Fe in the subsequent dehydration 2 O 3 . And FeSO 4 .7H 2 O in pyridine-H 2 Α-FeOOH can also be formed in O system, but only irregular α-Fe can be obtained after dehydration 2 O 3 Nano particles, which means that th...

Embodiment 3

[0036] Example 3: Different forms of α-Fe 2 O 3 Research on the visible light absorption characteristics of nanomaterials.

[0037] α-Fe 2 O 3 Nanomaterials have visible light absorption properties, different forms of α-Fe 2 O 3 Nanomaterials also respond differently to visible light. Figure 4 a is layered α-Fe 2 O 3 From the visible light absorption spectrum of the nano disc, it can be seen that the maximum absorption wavelength is about 600nm; Figure 4 b and Figure 4 c is irregular α-Fe 2 O 3 Nanoparticles (prepared in Example 2, b and c respectively correspond to the raw material FeCl 3 .6H 2 O and FeSO 4 .7H 2 O) The visible light absorption spectrum shows that the maximum absorption wavelength of both is about 420nm. It can be seen from comparison that layered α-Fe 2 O 3 Nano disc ratio irregular α-Fe 2 O 3 Nanoparticles have a wider range of visible light absorption. Therefore, layered α-Fe 2 O 3 Nano discs have excellent visible light absorption properties.

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Abstract

The invention relates to a preparation method for a layered alpha-Fe2O3 nano round cake with the enhanced visible light absorption characteristic, and relates to the technical field of preparation fornano materials with the enhanced visible light absorption characteristic. The preparation method has the advantages that pyridine-water serves as a reaction medium, ferrous chloride serves as an ironsource, and the layered alpha-Fe2O3 nano round cake is prepared through a solvothermal method; the form of a product can be controlled by regulating the ratio of pyridine to water, the type of ferricsalt and the reaction temperature; the problem that a template and a surfactant are difficult to remove can be solved; the obtained product has the advantages of controllable morphology, excellent performance and the like; an effective way is provided for producing a high-quality and high-performance alpha-Fe2O3 nano material; and the prepared product is of a layered micro-nano circular cake structure formed by assembling a plurality of alpha-Fe2O3 wafers with the nano-scale thickness.

Description

Technical field [0001] The invention relates to the technical field of the preparation of nanomaterials with enhanced absorption of visible light, in particular to a layered α-Fe with enhanced absorption of visible light 2 O 3 Preparation method of nano discs. Background technique [0002] Nanostructure α-Fe 2 O 3 It has broad application prospects in the fields of gas sensitivity, catalysis, magnetic recording and biomedicine. As we all know, α-Fe 2 O 3 The properties of nanomaterials are directly related to their morphology. Therefore, various forms of α-Fe are prepared 2 O 3 Nanomaterials have always been a focus of attention. [0003] Preparation methods such as span80, PVP, DMF, CTAB, (NH 4 ) 2 S 2 O 8 , NaH 2 PO 4 , NaClO 3 And sodium oleate are morphology control agents, and a series of α-Fe with regular morphology such as spindle, spherical and cubic are synthesized by hydrothermal method. 2 O 3 Nano-structure. Α-Fe can be obtained by the precursor method 2 O 3 Nanorods an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06B82Y40/00
CPCB82Y40/00C01G49/06C01P2002/72C01P2002/84C01P2004/04C01P2004/24
Inventor 韩成良叶劲松沈寿国张蔓茹徐泽忠
Owner HEFEI UNIV