Nanometer bismuth tungstate with hollow square ball structure and preparation method thereof

A technology of bismuth tungstate and nano-tungsten, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, and can solve problems such as high temperature requirements, poor sample dispersion and easy agglomeration, and poor particle uniformity. Achieve the effect of high phase purity, novel product appearance and strong repeatability

Inactive Publication Date: 2014-07-30
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the prior art, the Bi synthesized by the high-temperature solid-phase method 2 WO 6 The sample particles are large and the uniformity is poor, and the high temperature requirement in the synthesis process results in a great waste of energy; the Bi synthesized by the hydrothermal method 2 WO 6 The sample has poor dispersion and is easy to agglomerate

Method used

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  • Nanometer bismuth tungstate with hollow square ball structure and preparation method thereof
  • Nanometer bismuth tungstate with hollow square ball structure and preparation method thereof
  • Nanometer bismuth tungstate with hollow square ball structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1, take 0.75gBi(NO 3 ) 3 ·5H 2 O was added to the nitric acid solution and stirred thoroughly until clear.

[0038] Step 2, 0.25gNa 2 WO 4 2H 2 O was dissolved in deionized water and an appropriate amount of STAB alcohol aqueous solution was added and stirred until clear.

[0039] Step 3: Mix the clarified liquid obtained in Step 1 and Step 2 to obtain a milky white suspension.

[0040] Step 4, adjust the pH of the suspension obtained in Step 3 to 3 with ammonia water and sodium hydroxide solution, and then transfer it to a hydrothermal reaction kettle to control the temperature at 160° C. for 5 hours.

[0041] Step 5: After the reaction in Step 4 is completed, filter the reacted product, wash it several times with 30 wt% alcohol aqueous solution, and dry it at 60°C to obtain light yellow bismuth tungstate powder.

Embodiment 2

[0043] Step 1, take 1.5gBi(NO 3 ) 3 ·5H 2 O was added to the nitric acid solution and stirred thoroughly until clear.

[0044] Step two, take 0.5gNa 2 WO 4 2H 2 O was dissolved in deionized water and an appropriate amount of STAB alcohol aqueous solution was added and stirred until clear.

[0045] Step 3: Mix the clarified liquid obtained in Step 1 and Step 2 to obtain a milky white suspension.

[0046] Step 4: Adjust the pH of the suspension obtained in Step 3 to 3 with ammonia water and sodium hydroxide solution, and then transfer it to a hydrothermal reaction kettle to control the temperature at 160° C. for 8 hours.

[0047] Step 5: After the reaction in Step 4 is completed, filter the reacted product, wash it several times with 30 wt% alcohol aqueous solution, and dry it at 60°C to obtain light yellow bismuth tungstate powder.

Embodiment 3

[0049] Step 1, take 3gBi(NO 3 ) 3 ·5H 2 O was added to the nitric acid solution and stirred thoroughly until clear.

[0050] Step 2, take 1gNa 2 WO 4 2H 2 O was dissolved in deionized water and an appropriate amount of STAB alcohol aqueous solution was added and stirred until clear.

[0051] Step 3: Mix the clarified liquid obtained in Step 1 and Step 2 to obtain a milky white suspension.

[0052] Step 4, adjust the pH of the suspension obtained in Step 3 to 3 with ammonia water and sodium hydroxide solution, and then transfer it to a hydrothermal reaction kettle to control the temperature at 160° C. for 12 hours.

[0053] Step 5: After the reaction in Step 4 is completed, filter the reacted product, wash it several times with 30 wt% alcohol aqueous solution, and dry it at 60°C to obtain light yellow bismuth tungstate powder.

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Abstract

The invention discloses nanometer bismuth tungstate with a hollow square ball structure and a preparation method thereof. The preparation method is characterized in that a hollow square ball formed by stacked bismuth tungstate nanosheets is prepared by using bismuth nitrate pentahydrate as a bismuth source, sodium tungstate dihydrate as a tungsten source and an STAB (Sodium triacetoxyborohydride)-containing alcohol-water solution as a dispersing agent and utilizing ammonia water and sodium hydroxide under a hydrothermal condition, and the thicknesses of the nanosheets are about 30nm; and the inner diameter of the square ball is about 1.5 micrometers, and the outer diameter of the square ball is about 2 micrometers. The preparation method has the advantages of simplicity, easiness in operation, strong repeatability, environment protection, no toxicity and harmlessness in a preparation process, novel product morphology, high phase purity and the like and has a high application value in terms of pollution treatment, ray absorption and the like.

Description

technical field [0001] The invention belongs to the technical field of synthesis of inorganic nanometer materials, in particular to a synthesis method of nano bismuth tungstate with a hollow square sphere structure. Background technique [0002] Bismuth Tungstate Bi 2 WO 6 (BWO) is a layered perovskite-like structure (Bi 2 o 2 ) 2 +(A m-1 B m o 3m+1 ) 2- : m=1–5, the simplest crystal with octahedral cubic crystal system, its atomic layers are packed compactly and easy to form a regular sheet structure. BWO bandgap width (E bg = ca.2.76eV), has strong absorption in the visible light band, and has high use value in catalytic degradation of pollutants, and the new Bi 2 WO 6 The photocatalyst has good stability, is non-toxic and harmless, and is an environmentally friendly photocatalytic material. [0003] Since Bi 2 WO 6 Since the catalytic performance of Bi was reported, many scholars have 2 WO 6 The research focus has been on controlling the Bi 2 WO 6 In ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B82Y40/00B82Y30/00
Inventor 周元林李银涛李迎军刘栋梁
Owner SOUTHWEAT UNIV OF SCI & TECH
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