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Method for low-temperature preparation of nano bismuth tungstate

A technology of nano-tungsten and bismuth acid, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of high energy consumption and high conditions, and achieve the effect of high energy consumption, high conditions and low price

Inactive Publication Date: 2014-03-26
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These preparation methods have high conditions and high energy consumption

Method used

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  • Method for low-temperature preparation of nano bismuth tungstate
  • Method for low-temperature preparation of nano bismuth tungstate
  • Method for low-temperature preparation of nano bismuth tungstate

Examples

Experimental program
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Embodiment 1

[0027] First prepare 2mmol / L Bi(NO 3 ) 3 ·5H 2 O aqueous solution and 1mmol / L Na 2 WO 4 2H 2 40 mL of O aqueous solution. The surfactants are PVP and CTAB, and 0.12 g is added to each reactant solution. In the preparation of Bi(NO 3 ) 3 ·5H 2 In the process of O solution, first dissolve it with 5mL of 1mol / L nitric acid aqueous solution, and then add 35mL of deionized water. Under the condition of magnetic stirring, the Bi(NO 3 ) 3 ·5H 2 O solution was added dropwise to Na 2 WO 4 2H 2 O solution. The pH of the solution was adjusted to 7 by using 1 mol / L NaOH aqueous solution for pH adjustment. Transfer the resulting mixed solution into a sealed glass bottle. When the temperature of the drying oven was stable at 98°C, the glass bottle was placed in a constant temperature drying oven. After reacting for 6 hours, the obtained precipitate was washed twice with water and ethanol respectively, and then put into an oven and dried at 60°C for 1 hour. The bismuth tu...

Embodiment 2

[0029] Prepare 2mmol / L Bi(NO 3 ) 3 ·5H 2 O aqueous solution and 1mmol / L Na 2 WO 4 2H 2 40 mL of O aqueous solution. 0.12 g of surfactant PVP was added to each reactant solution. In the preparation of Bi(NO 3 ) 3 ·5H 2 In the process of O solution, first dissolve it with 5mL of 1mol / L nitric acid aqueous solution, and then add 35mL of deionized water. Under the condition of magnetic stirring, the Bi(NO 3 ) 3 ·5H 2 O solution was added dropwise to Na 2 WO 4 2H 2 O solution. The pH of the solution was adjusted to 7 by using 1 mol / L NaOH aqueous solution for pH adjustment. Transfer the resulting mixed solution into a sealed glass bottle. When the temperature of the drying oven was stable at 98°C, the glass bottle was placed in a constant temperature drying oven. After reacting for 6 hours, the obtained precipitate was washed twice with water and ethanol respectively, and then put into an oven and dried at 60°C for 1 hour. The prepared bismuth tungstate is a mixed...

Embodiment 3

[0031] Prepare 2mmol / L Bi(NO 3 ) 3 ·5H 2 O aqueous solution and 1mmol / L Na 2 WO 4 2H 2 40 mL of O aqueous solution. 0.04 g of surfactant CTAB was added to each reactant solution. In the preparation of Bi(NO 3 ) 3 ·5H 2 In the process of O solution, first dissolve it with 5mL of 1mol / L nitric acid aqueous solution, and then add 35mL of deionized water. Bi(NO 3 ) 3 ·5H 2 O solution was added dropwise to Na 2 WO 4 2H 2 O solution. The pH of the solution was adjusted to 7 by using 1 mol / L NaOH aqueous solution for pH adjustment. Transfer the resulting mixed solution into a sealed glass bottle. When the temperature of the drying oven was stable at 98°C, the glass bottle was placed in a constant temperature drying oven. After reacting for 6 hours, the obtained precipitate was washed twice with water and ethanol respectively, and then put into an oven and dried at 60°C for 1 hour. The prepared bismuth tungstate has a nano-sheet structure, the thickness of the sheet is...

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Abstract

The invention discloses a method for low-temperature preparation of nano bismuth tungstate. The preparation process of the method comprises the following steps: taking Bi(NO3)3.5H2O and Na2WO4.2H2O as raw materials, preparing Bi(NO3)3.5H2O and Na2WO4.2H2O water solutions of various concentrations according to different proportions, dripping the Bi(NO3)3.5H2O solution into the Na2WO4.2H2O solution under magnetic stirring, then transferring the mixed solutions into a common sealed glass bottle, and synthesizing nano bismuth tungstate (Bi2WO6) by a hydrothermal method at the temperature below 100 DEG C and at nearly normal pressure. The preparation conditions of the method are far lower than those of the conventional method, wherein the temperature is 160-200 DEG C, and the reaction time is greater than or equal to 24 h; the method is easy to operate and low in energy consumption.

Description

Technical field [0001] The present invention involves a method of preparation of nano -tungsten acid materials with low temperature water thermal law. Background technique [0002] At present, many oxides and sulfide semiconductors for photocatalytic have been reported, including TIO 2 , ZNO, SNO 2 , ZRO 2 , CDS, etc.As a new type of photocatalytic material, the catalyst has become a research hotspot in the field of photocatalytic in recent years.Tungsten acid b (BI 2 WO 6 ) The bandwidth is small, and the spectral absorption range is wide. As a visible optical catalyst with a good prospect, various shapes, including particles, slices, and even three -dimensional structures of flowers, microspheres, and nest structures 2 WO 6 It has been reported that research comparison has found that its appearance has greatly affected its optical catalytic performance. [0003] Traditional methods of preparing tungsten acid crickets include solid -phase sintering method, microwave water therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B82Y30/00B82Y40/00
Inventor 魏昂刘雁军
Owner NANJING UNIV OF POSTS & TELECOMM
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