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Preparation method and application of spherical tantalum pentoxide

A tantalum pentoxide, spherical technology, applied in the field of photocatalytic materials, can solve the problems of waste liquid discharge, long preparation cycle, cumbersome operation steps, etc., and achieve the effect of simple method

Inactive Publication Date: 2013-09-04
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the preparation of nano-Ta 2 o 5 There are few reports on the method of spherical powder, and these reported methods, such as the sol-gel method, have cumbersome operation steps, long preparation period, and involve waste liquid discharge.

Method used

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  • Preparation method and application of spherical tantalum pentoxide
  • Preparation method and application of spherical tantalum pentoxide
  • Preparation method and application of spherical tantalum pentoxide

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Measure 36.3mL of absolute ethanol into a 150mL beaker (evaporating dish), then add 3.63mL of tantalum ethoxide (the volume ratio of absolute ethanol / tantalum ethoxide is 10:1, the total volume of the solution is 40 mL), and stir the solution until it becomes transparent . Ignite it with a match, the liquid starts to burn from the liquid surface, and a white sample is obtained after burning. Determine the XRD of the sample and find that the obtained sample is amorphous Ta 2 o 5 ( figure 2 (I), curve c). The resulting amorphous Ta 2 o 5 Place it in a muffle furnace for high temperature annealing at 800°C for 3 hours, measure the XRD of the sample, and find that the obtained Ta 2 o 5 The sample presents a good crystal form ( figure 2 (II), curve c). Determination of the SEM surface morphology of the sample, it can be found that the Ta 2 o 5 for microspheres ( image 3 (a)). Ta 2 o 5 The UV-Vis diffuse reflectance spectrum test shows that the Ta 2 o 5 Ha...

Embodiment 2

[0024] Measure 33.3 mL of absolute ethanol into a 150 mL beaker, then add 6.6 mL of tantalum ethoxide (the volume ratio of absolute ethanol / tantalum ethoxide is 5:1, the total volume of the solution is 40 mL), and stir the solution until it becomes transparent. When lit with a match, the liquid starts to burn from the liquid surface. During the burning process, water is continuously generated, and the generated water promotes the hydrolysis of tantalum ethoxide to form Ta 2 o 5 , a white sample was obtained after combustion. Determination of the XRD of the sample ( figure 2 (I) Curve b), the obtained sample was found to be amorphous Ta 2 o 5 . The resulting amorphous Ta 2 o 5 Place it in a muffle furnace for high temperature annealing at 800°C for 3 hours, measure the XRD of the sample, and find that the obtained Ta 2 o 5 The sample presents a good crystal form ( figure 2 (II), curve b). Measure the SEM surface morphology of the sample and find that the Ta obtained...

Embodiment 3

[0026] Measure 37.5 mL of absolute ethanol into a 150 mL beaker, then add 2.5 mL of tantalum ethoxide (the volume ratio of absolute ethanol / tantalum ethoxide is 15:1, the total volume of the solution is 40 mL), and stir the solution until it becomes transparent. When lit with a match, the liquid starts to burn from the liquid surface. During the burning process, water is continuously generated, and the generated water promotes the hydrolysis of tantalum ethoxide to form Ta 2 o 5 , a white sample was obtained after combustion. Determination of the XRD of the sample ( figure 2 (I), curve d ), it can be found that the obtained sample is amorphous Ta 2 o 5 . The resulting amorphous Ta 2 o 5 Place it in a muffle furnace for high temperature annealing at 800°C for 3 hours, measure the XRD of the sample, and find that the obtained Ta 2 o 5 The sample presents a good crystal form ( figure 2 (II), curve d). Determination of the SEM surface morphology of the sample, it can ...

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Abstract

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a preparation method and application of spherical tantalum pentoxide. The preparation method comprises steps as follows: a solution containing a certain amount of tantalum ethoxide is firstly prepared as a raw material, and then ignited with naked fire; in the solution combustion process, water and CO2 are generated, and tantalum ethoxide and the generated water are subjected to hydrolysis reaction on the interface; and Ta2O5 is continuously generated on the interface as the combustion process proceeds, and finally disappears when all the solution is combusted, thereby forming the Ta2O5 spherical powder material. The experiment indicates that the nano spherical Ta2O5 powder prepared by the method can be used for photocatalytic degradation of organic pollutants or preparation of dye-sensitized solar cell photoanodes. Compared with the prior art, the method provided by the invention has the advantages of simple technique, no need of special equipment, and no generation of any waste liquid, and can implement energy saving and emission reduction in the production process.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a preparation method of spherical tantalum pentoxide. Background technique [0002] Tantalum pentoxide (Ta 2 o 5 ) are widely used in dynamic random access memories, intermediate insulators, atomic switches, anti-reflection film coatings, gas sensors, and photocatalysts. Ta 2 o 5 It has unique physical and chemical properties: high dielectric constant, high refractive index, high temperature piezoelectric performance, excellent photoelectric performance, and good chemical and thermal stability. Ta 2 o 5 With suitable valence and conduction band positions, it is an excellent photocatalyst for hydrogen production. [0003] The spherical structure can effectively improve the utilization rate of incident light because it can reflect incident light multiple times. So far, the preparation of nano-Ta 2 o 5 There are few reports on the method of sph...

Claims

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Application Information

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IPC IPC(8): C01G35/00H01G9/042B01J23/20
Inventor 崔晓莉李靖孙明轩
Owner FUDAN UNIV
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