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Preparation method of amorphous tantalum oxide nanospheres

A tantalum oxide and amorphous technology, applied in the field of nanomaterials, can solve the problems of low photocatalytic efficiency, achieve excellent photocatalytic activity, high feasibility, and low production cost

Pending Publication Date: 2021-06-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Ta 2 o 5 The wide bandgap (~4.0eV) limits its application in the field of photocatalysis. This wide bandgap semiconductor can only absorb ultraviolet light to generate electron-hole pairs for photocatalytic applications.
Yet ultraviolet light only accounts for about 5% of sunlight, and this incomplete utilization of sunlight energy is the cause of Ta 2 o 5 The main reason for the low photocatalytic efficiency

Method used

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  • Preparation method of amorphous tantalum oxide nanospheres
  • Preparation method of amorphous tantalum oxide nanospheres
  • Preparation method of amorphous tantalum oxide nanospheres

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0044] Such as figure 1 As shown, Example 1 proposes a rough surface amorphous Ta 2 o 5 The preparation method of nanosphere specifically comprises the following steps:

[0045] 1. Weigh 0.05mmol of TaCl 5 The raw materials were dissolved in 15mL of ethanol and mixed well.

[0046] 2. Add oxalic acid to the ethanol solution of tantalum chloride, the ratio of tantalum chloride to oxalic acid is 1:5, stir well to make the solution evenly mixed.

[0047] 3. Transfer the mixed solution into the autoclave for alcohol thermal reaction, the hydrothermal temperature is 240°C, and the hydrothermal time is 12h.

[0048] 4. The precipitate obtained from the alcohol thermal reaction was centrifuged at 4000rpm for 8min, and dried at 60°C for 4h. A smooth amorphous Ta 2 o 5 nanospheres.

[0049] figure 2 The upper part of the XRD spectrum is the XRD spectrum of the product prepared in Example 1. It can be seen from the figure that the product has no obvious XRD characteristic peak...

Embodiment 2

[0052] Embodiment 2 proposes a smooth amorphous Ta 2 o 5 The preparation method of nanosphere specifically comprises the following steps:

[0053] 1. Weigh 0.05mmol of TaCl 5 The raw materials were dissolved in 15mL of ethanol and mixed well.

[0054] 2. Transfer the ethanol solution of tantalum chloride into the autoclave for alcohol thermal reaction, the hydrothermal temperature is 240°C, and the hydrothermal time is 12h.

[0055] 3. The precipitate obtained from the alcohol thermal reaction was centrifuged at 4000rpm for 8min, and dried at 60°C for 4h. A smooth amorphous Ta 2 o 5 nanospheres.

[0056] figure 2 The lower part of the XRD pattern is the XRD pattern of the product prepared in Example 2. It can be seen from the figure that the alcohol thermal product in Example 2 is also in an amorphous state. Figure 4 Bottom infrared spectrum is the infrared spectrum of the product that embodiment 2 makes, as can be seen from the figure compared with the infrared spec...

Embodiment 3

[0058] This embodiment provides a rough surface amorphous Ta 2 o 5 The preparation method of nanospheres is to adjust the amount of oxalic acid added in the system, and to explore the influence of the amount of oxalic acid on the shape of the product. The specific steps are as follows.

[0059] 1. Weigh 0.05mmol of TaCl 5 The raw materials were dissolved in 15mL of ethanol and mixed well.

[0060] 2. Add oxalic acid to the ethanol solution of tantalum chloride, the ratio of tantalum chloride to oxalic acid is 1:1, 1:10, stir well to make the solution evenly mixed.

[0061] 3. Transfer the mixed solution into the autoclave for alcohol thermal reaction, the hydrothermal temperature is 240°C, and the hydrothermal time is 12h.

[0062] 4. The precipitate obtained from the alcohol thermal reaction was centrifuged at 4000rpm for 8min, and dried at 60°C for 4h.

[0063] The obtained product is amorphous Ta with rough surface 2 o 5 nanospheres and the particle diameter obtained ...

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Abstract

The invention discloses an amorphous tantalum oxide nanosphere and a preparation method thereof. The method comprises the following steps: adding oxalic acid into an ethanol solution of tantalum chloride, uniformly stirring, transferring into a high-pressure reaction kettle, and carrying out alcohol thermal reaction to obtain the amorphous tantalum oxide nanospheres. According to the invention, the diameter of the amorphous cerium oxide nanosphere obtained by the method is about 400-500 nm, the particle size is uniform, and the dispersity is good; and compared with commercial tantalum oxide, the surface area of the amorphous tantalum oxide nanosphere is obviously increased, and more adsorption sites are provided for dye molecules, so that the improvement of adsorption and photocatalytic performance is promoted.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to an amorphous tantalum oxide nanosphere and a preparation method thereof. Background technique [0002] In recent years, the application of photocatalytic degradation of organic molecules in water has received widespread attention. Since the photocatalytic reaction does not require additional energy, dyes can be decomposed by using solar energy. When the photocatalyst is excited by light, the electrons will jump from the valence band of the semiconductor to the conduction band, generating electron-hole pairs, and a series of reactions between the electrons and water or oxygen will generate hydroxyl radicals, and superoxide radicals have strong oxidation properties. It can decompose organic dye macromolecules into small inorganic molecules such as water and carbon dioxide. [0003] Ta 2 o 5 As a semiconductor material with stable physical and chemical properties, it has received...

Claims

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Application Information

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IPC IPC(8): C01G35/00B01J23/20B01J35/02B01J35/08B01J35/10
CPCC01G35/00B01J23/20C01P2004/62C01P2004/32C01P2002/72C01P2004/03C01P2002/80C01P2006/12B01J35/39B01J35/40B01J35/51B01J35/615
Inventor 付海涛王岩杨晓红安希忠张浩邹清川尹若铭
Owner NORTHEASTERN UNIV
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