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Method for preparing sheet Bi2WO6

A flake and solution technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, tungsten compounds, etc., can solve the problems of low proportion and low photocatalytic reaction efficiency, and achieve no environmental pollution , Simple process, good dispersion of powder particles

Inactive Publication Date: 2017-09-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rutile TiO 2 The bandgap width is 3.0eV, and the corresponding absorption band is below 415nm, which belongs to short-wavelength ultraviolet and near-ultraviolet light. %

Method used

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  • Method for preparing sheet Bi2WO6
  • Method for preparing sheet Bi2WO6
  • Method for preparing sheet Bi2WO6

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Dissolve 1.5mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.10mol / L;

[0036] 2) 3mmol bismuth ammonium citrate is dissolved in 15ml deionized water, so that the molar concentration of bismuth ammonium citrate solution is 0.20mol / L, a certain amount of NaOH tablet is dissolved in 10ml deionized water, so that the sodium hydroxide solution molar concentration 0.4mol / L;

[0037] Add the ammonium bismuth citrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the sodium hydroxide solution dropwise to the above mixed solution at the same rate, and stir for 30 minutes, then at 180 ℃ for 2 hours for heat treatment. Then, lower to room temperature, take out the reaction product, filter, wash with dilute acetic acid and deionized water successively, and dry at 60°C to obtain flaky Bi 2 WO 6 .

Embodiment 2

[0039] 1) Dissolve 3mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.20mol / L;

[0040] 2) 6mmol bismuth ammonium citrate is dissolved in 15ml deionized water, so that the molar concentration of bismuth ammonium citrate solution is 0.40mol / L, a certain amount of NaOH tablet is dissolved in 10ml deionized water, so that the sodium hydroxide solution molar concentration 0.8mol / L;

[0041] Add the ammonium bismuth citrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the sodium hydroxide solution dropwise to the above mixed solution at the same rate, and stir for 30 minutes, then at 200 ℃ for 6 hours to heat treatment. Then, after cooling down to room temperature, the reaction product was taken out, filtered, washed three times with dilute acetic acid, deionized water and ethanol, and dried at 60°C to obtain flaky Bi 2 WO 6 .

[0042] The synthesized fl...

Embodiment 3

[0044] 1) Dissolve 4.5mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.30mol / L;

[0045] 2) 9mmol bismuth ammonium citrate is dissolved in 15ml deionized water, so that the molar concentration of bismuth ammonium citrate solution is 0.60mol / L, a certain amount of NaOH tablet is dissolved in 10ml deionized water, so that the sodium hydroxide solution molar concentration 2mol / L;

[0046] Add the bismuth ammonium citrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the sodium hydroxide solution dropwise to the above mixed solution at the same rate, and stir for 30 minutes, then at 250 ℃ for 15 hours for heat treatment. Then, after cooling down to room temperature, the reaction product was taken out, filtered, washed three times with dilute acetic acid, deionized water and ethanol, and dried at 60°C to obtain flaky Bi 2 WO 6 .

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Abstract

The present invention relates to a kind of method for preparing flake Bi2WO6, comprising the following steps: 1) adding bismuth ammonium citrate solution to sodium tungstate solution dropwise; the molar concentration of said bismuth ammonium citrate solution is 0.20~0.60mol / L, The molar concentration of the sodium tungstate solution is 0.10~0.30mol / L; 2) continue to add the sodium hydroxide solution dropwise, carry out the hydrothermal reaction after mixing, filter and wash to obtain the flake Bi2WO6; the mole of the sodium hydroxide solution The concentration is 0.1~2mol / L. The flaky Bi2WO6 prepared by this method has good morphology and uniform size.

Description

technical field [0001] The present invention relates to Bi 2 WO 6 The synthetic field of, be specifically related to a kind of preparation flake Bi 2 WO 6 Methods. Background technique [0002] In the early 1970s, the energy crisis broke out worldwide, and how to develop and utilize energy reasonably and effectively was the focus of global attention at that time. Rutile TiO 2 The bandgap width is 3.0eV, and the corresponding absorption band is below 415nm, which belongs to short-wavelength ultraviolet and near-ultraviolet light. %. [0003] In the recent research on semiconductor catalysts, improving the photocatalytic reaction efficiency and developing new photocatalysts or modifying photocatalysts to shift the absorption band to the visible light region has become the focus of research. [0004] Bi 2 WO 6 It is the simplest Aurivillius-type oxide with a layered structure containing WO 6 Layers of perovskite structure. Thanks Bi 2 WO 6 It has properties such as...

Claims

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Application Information

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IPC IPC(8): C01G41/00B82Y30/00
CPCC01G41/00B82Y30/00C01P2002/72C01P2004/03C01P2004/62
Inventor 徐刚皇甫统帅孙小磊沈鸽韩高荣
Owner ZHEJIANG UNIV
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