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Method for preparing tantalum oxide nanospheres

A technology of tantalum oxide and nanospheres, which is applied in the field of nanomaterials, can solve problems such as complicated product synthesis routes, environmental pollution, and high risk of HF, and achieve the effects of low production cost, good repeatability, and high product purity

Pending Publication Date: 2021-03-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The methods mentioned above have their own problems: (1) need extremely high calcination temperature in the molten salt method, Ta 2 o 5 Raw material → intermediate product NaTaO 3 →Ta 2 o 5 The synthesis route of the product is complicated and only anisotropic nanoparticles can be synthesized; (2) the HF used in the hydrothermal method is highly dangerous and the waste liquid is not properly treated, which will easily pollute the environment, and only anisotropic nanoparticles can be synthesized at the same time; ( 3) Although the template method can synthesize tantalum oxide nanospheres or spherical shells, the removal of the template agent makes the reaction process difficult to operate

Method used

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  • Method for preparing tantalum oxide nanospheres
  • Method for preparing tantalum oxide nanospheres
  • Method for preparing tantalum oxide nanospheres

Examples

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Embodiment 1

[0048] Such as figure 1 As shown, Example 1 proposes a method for preparing tantalum oxide nanospheres by a template-free method, which specifically includes the following steps:

[0049] a: Ta 2 o 5 Preparation of nanosphere precursors

[0050] a1: Weigh 0.05mmol of TaCl 5 The raw materials were dissolved in 15mL of ethanol and mixed well.

[0051] a2: Add urea and oxalic acid to the ethanol solution of tantalum chloride, the substance ratio of tantalum chloride and urea is 1:10, and the substance ratio of tantalum chloride and oxalic acid is 1:5, stir well to mix the solution uniform.

[0052] a3: Transfer the mixed solution into an autoclave for alcohol thermal reaction, the hydrothermal temperature is 260°C, and the hydrothermal time is 12h.

[0053] a4: The precipitate obtained from the alcohol thermal reaction was centrifuged at 4000rpm for 8min, and dried at 60°C for 4h. get it 2 o 5 Nanosphere precursors.

[0054] b: Ta 2 o 5 Preparation of nanospheres

[...

Embodiment 2

[0059] This embodiment provides a Ta 2 o 5 The preparation method of nanosphere, other conditions are identical with embodiment 1, just with TaCl 5 The amount added was changed to 0.2 mmol. The experimental results are almost the same as in Example 1, and the Ta with a diameter of 300-400nm 2 o 5 nanospheres.

[0060] This shows that TaCl 5 The initial addition amount between 0.01-0.2mmol has no significant effect on the morphology of the product.

Embodiment 3

[0062] This embodiment provides a Ta 2 o 5 The preparation method of nanospheres, other conditions are the same as in Example 1, except that the reaction temperature is changed to 200°C and 280°C. The experimental results are almost the same as in Example 1, and the Ta 2 o 5 nanospheres.

[0063] This shows that the reaction temperature has no significant effect on the product morphology in the range of 200°C-280°C.

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Abstract

The invention discloses a tantalum oxide nanosphere prepared by a template-free method and a method thereof. The method comprises the following steps: adding urea and 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 a tantalum oxide nanosphere precursor; and collecting the precursor, and calcining the precursor in a muffle furnace to obtain the tantalum oxide nanospheres. The tantalum oxide nanospheres obtained by the method disclosed by the invention are 300-400nm in diameter, uniform in granularity and good in dispersity. Compared with commercial tantalum oxide, the surface area of the tantalum oxide nanospheres is remarkably increased, more adsorption sites are provided for dye molecules, and therefore the photocatalytic performance is promoted to be improved.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a tantalum oxide nanosphere prepared by a template-free method and a method thereof. Background technique [0002] Tantalum oxide (Ta 2 o 5 ) is the most common oxide of tantalum and the final product of metal tantalum oxidation in air. Because of Ta 2 o 5 The chemical properties are very stable, insoluble in general acid or alkali, so Ta 2 o 5 It is widely used as a coating material, a catalyst, and the like. In recent years, the rise of nanotechnology has 2 o 5 The application in the field of photocatalysis provides the possibility. With the same volume of nanomaterials and bulk materials, the specific surface area of ​​nanomaterials is significantly larger than that of bulk materials, which provides more active sites for reactions and shorter The electron or ion diffusion distance can also further improve the photocatalytic performance of the material. [0003] At th...

Claims

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Application Information

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IPC IPC(8): C01G35/00B82Y40/00
CPCB82Y40/00C01G35/00C01P2002/72C01P2002/84C01P2004/03C01P2004/32C01P2004/62C01P2006/12
Inventor 付海涛王岩杨晓红安希忠邹清川张浩梁晋楠
Owner NORTHEASTERN UNIV
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