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Preparation method of Cr-doped alpha-Fe2O3 micro-nano crystal

A micro-nano, reaction technology, applied in nanotechnology, iron oxide, iron oxide/iron hydroxide and other directions, can solve problems such as no literature reports, and achieve the effects of excellent performance, low cost and low cost

Active Publication Date: 2018-12-14
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cr doped α-Fe 2 o 3 The preparation of micro-nano crystals has not been reported in the literature

Method used

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  • Preparation method of Cr-doped alpha-Fe2O3 micro-nano crystal
  • Preparation method of Cr-doped alpha-Fe2O3 micro-nano crystal
  • Preparation method of Cr-doped alpha-Fe2O3 micro-nano crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Spindle Cr doped α-Fe 2 o 3 Preparation and characterization of micro-nanocrystals

[0018] First add 1g of Na 2 CrO 4 , 1.4g of FeCl 2 .4H 2 O was added to 50mL of deionized water, stirred and dissolved, then placed in an oven and heated to 180°C at a constant temperature. After 24 hours of reaction, the precipitate was taken out, washed and dried to obtain Cr-doped α-Fe 2 o 3 micro-nano crystals.

[0019] Depend on figure 1 a It can be seen that the prepared product is composed of some spindle-shaped particles; by figure 2 b It is further seen that the long axis of a single elliptical particle is about 1 μm, and the short axis is about 250 nm. Depend on figure 1 Inset b, it can be seen that a single spindle-shaped particle is composed of several nanorods with a diameter of about 5 nm. The surface scanning energy spectrum analysis of a single particle shows that the particle is mainly composed of Fe, O and Cr elements (see figure 1 c), the ratio...

Embodiment 2

[0021] Example 2: Dumbbell-shaped Cr-doped α-Fe 2 o 3 Preparation and characterization of micro-nanocrystals

[0022] First, 1.8g of Na 2 CrO 4 , 1.4g of FeCl 2 .4H 2 O was added to 50 mL of deionized water, stirred and dissolved, then 0.6 g of hydroxylamine hydrochloride was added, and then placed in an oven and heated to 180 °C at a constant temperature. After 16 hours of reaction, the precipitate was taken out, washed and dried to obtain Cr-doped α- Fe 2 o 3 micro-nano crystals.

[0023] Preparation of spindle-type Cr-doped α-Fe in Example 1 2 o 3 In the system of micro-nano crystals, a certain amount of hydroxylamine hydrochloride is added, and the product of Example 2 obtained after the reaction is dumbbell-shaped Cr-doped α-Fe 2 o 3 micro-nanocrystals (see image 3 ), which shows that the introduction of hydroxylamine hydrochloride has a great influence on the morphology of the final product formed. Experiments have found that the addition of hydroxylamine h...

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Abstract

The invention relates to a preparation method of Cr-doped alpha-Fe2O3 micro-nano crystal, which relates to the technical fields of nano powder preparation and application. The method comprises two processes of preparation of a reaction precursor and a hydrothermal reaction, and is characterized in that 1 to 1.8 g of Na2CrO4 and 1.4 g of FeCl2.4H2O are added to 50 mL of deionized water, after stirring and dissolving, 0-1.2 g of hydroxylamine hydrochloride is added, and then a mixture is heated in an oven at a constant temperature to obtain Cr-doped alpha-Fe2O3 micro-nano crystal of a spindle shape or a dumbbell shape. The method adopts FeCl2.4H2O and Na2CrO4 as raw materials, and successfully prepares Cr-doped alpha-Fe2O3 micro-nano crystal by a hydrothermal reaction method, and the dumbbell-shaped Cr-doped alpha-Fe2O3 micro-nano crystal is obtained by using hydroxylamine hydrochloride. The method has the advantages of simple process, low cost, environmental friendliness and controllable shape, and is conducive to popularization and application.

Description

technical field [0001] The invention relates to the technical field of nano powder preparation and application, in particular to a Cr-doped α-Fe 2 o 3 Preparation methods of micro-nanocrystals. Background technique [0002] α-Fe 2 o 3 and α-Cr 2 o 3 Both belong to the corundum structure, and the unit cell parameters of the two crystals are relatively close (α-Fe 2 o 3 : a=0.56356nm, c=1.37489nm; α-Cr 2 o 3 : a=0.4954nm, c=1.3584nm). At the same time, Fe 3+ (0.0645nm) and Cr 3+ (0.0615nm) ionic radius is also very similar. Therefore, the two can form a completely miscible solid solution under suitable conditions. [0003] Using various valence metals to treat α-Fe 2 o 3 Doping can effectively change the α-Fe 2 o 3 Catalytic, gas sensitive and magnetic properties. For example, Cu can be obtained by co-precipitation and sol-gel methods 2+ , Zn 2+ , Y 3+ , Sn 4+ and Sb 5+ Equally doped rod, cubic, peanut, needle and spherical α-Fe 2 o 3 crystals. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y40/00
CPCB82Y40/00C01G49/06C01P2004/16
Inventor 韩成良张曼茹刘自然沈寿国刘丽
Owner HEFEI UNIV
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