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Bismuth tungstate nanocrystal and preparation method thereof

A nano-grain, bismuth tungstate technology, applied in nanotechnology, chemical instruments and methods, tungsten compounds, etc.

Inactive Publication Date: 2013-05-15
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on Bi3.84W0.16O6.24 crystal form bismuth tungstate with spherical shape, uniform size and high dispersion

Method used

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  • Bismuth tungstate nanocrystal and preparation method thereof
  • Bismuth tungstate nanocrystal and preparation method thereof
  • Bismuth tungstate nanocrystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 1.2 grams of bismuth sulfate to 0.6 milliliters of concentrated nitric acid, add 15 milliliters of deionized water after initial stirring, stir to dissolve and dilute, and record it as solution A. In addition, 0.55 g of ammonium paratungstate decahydrate was added to 30 ml of deionized water, stirred and dissolved, and recorded as solution B.

[0024] Add solution A to solution B dropwise and stir while adding to form a homogeneous suspension. Adjust the pH of the solution to approximately 8 with 20% ammonia water. Then aged at 368K for 24 hours in a closed state. After aging, the precipitated product is washed with a large amount of deionized water, and dried to obtain bismuth tungstate nanocrystals.

[0025] The crystal form of the prepared bismuth tungstate (Bi3.84W0.16O6.24) is consistent with the standard powder diffraction card (JCPDS: 43-0447). Above 99%.

Embodiment 2

[0027] Add 1.5 grams of bismuth nitrate pentahydrate into 0.8 milliliters of concentrated nitric acid, add 20 milliliters of deionized water after preliminary stirring, stir to dissolve and dilute, and record it as solution A. In addition, 0.5 g of sodium tungstate monohydrate was added to 40 ml of deionized water, stirred and dissolved, and recorded as solution B.

[0028] Add solution A to solution B dropwise and stir while adding to form a homogeneous suspension. Adjust the pH of the solution to approximately 9 with 25% ammonia water. Then aged for 48 hours at a temperature of 353K in a closed state. After aging, the precipitated product is washed with a large amount of deionized water, and dried to obtain bismuth tungstate nanocrystals.

[0029] The crystal form of the prepared bismuth tungstate (Bi3.84W0.16O6.24) is consistent with the standard powder diffraction card (JCPDS: 43-0447). Above 99%.

Embodiment 3

[0031] Add 3.0 grams of bismuth oxycarbonate to 1.2 milliliters of concentrated nitric acid, add 35 milliliters of deionized water after preliminary stirring, stir to dissolve and dilute, and record it as solution A. In addition, 1.2 grams of potassium paratungstate octahydrate was added to 90 ml of deionized water, stirred and dissolved, and recorded as solution B.

[0032] Add solution A to solution B dropwise and stir while adding to form a homogeneous suspension. Adjust the pH of the solution to about 9 with 10% ammonia water. Then aged at a temperature of 333K for 72 hours in a closed state. After aging, the precipitated product is washed with a large amount of deionized water, and dried to obtain bismuth tungstate nanocrystals.

[0033] The crystal form of the prepared bismuth tungstate (Bi3.84W0.16O6.24) is consistent with the standard powder diffraction card (JCPDS: 43-0447). Above 99%.

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Abstract

The invention relates to a bismuth tungstate nanocrystal and a preparation method thereof. The nanocrystal is a spherical bismuth tungstate nanocrystal with diameter of 100-200 nm, uniform size and high dispersion. The preparation method of the nanocrystal comprises steps of: adding a bismuth source to concentrated nitric acid, conducting preliminary stirring, adding deionized water and performing further stirring for dissolving dilution; adding tungstate to deionized water and conducting stirring to dissolve it; dropwisely adding the first solution into the second solution under stirring to form a homogeneous suspension; adjusting the pH value with an ammonia solution; then conducting ageing for 4-72h in a closed static state at a temperature of 323-373K; after the ageing, washing the precipitate product with deionized water; and drying to obtain the bismuth tungstate nanocrystal. The preparation method has simple process and flow, wide parameter adjustable range, strong repeatability and low cost, and shows commercial prospect. The prepared bismuth tungstate nanocrystal has high application value in the fields of photocatalysis, scintillation materials, gas sensitive materials, magnetic devices and light-guide fiber.

Description

technical field [0001] The invention relates to a tungstate and a preparation method thereof, in particular to a bismuth tungstate nanocrystal grain and a preparation method thereof, belonging to the technical field of inorganic nanomaterials and synthesis. Background technique [0002] Tungstate nanomaterials have good application prospects in scintillation materials, optical fibers, photoluminescent substances, microwave applications, humidity sensors, magnetic devices, catalysts and corrosion inhibitors, and have become a research hotspot in recent years. In addition to the above application potential, bismuth tungstate nanomaterials are also good photocatalysts for degrading organic pollutants under light radiation. [0003] In 1999, Professor Kudo and others reported for the first time that bismuth tungstate (Bi2WO6) can effectively degrade organic pollutants under visible light radiation with a wavelength greater than 420 nm (Chemistry Letters, 1999, 28, 1103-1104). A...

Claims

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Application Information

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IPC IPC(8): C01G41/00B82Y40/00
Inventor 殷天惠赵斌何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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