Preparation method of laminar-card-structure bisumth tungstate microcrystals

A bismuth tungstate and card technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of high energy consumption, small specific surface area, and reduced photocatalytic performance, and achieve low energy consumption and product crystallinity Good results

Inactive Publication Date: 2012-09-19
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0003] Bi 2 WO 6 The traditional preparation method is a high-temperature solid-phase method, but it consumes a lot of energy, and the prepared powder has a large particle size and a small specific surface area, which is not conducive to the adsorption of light and degradation substances by the photocatalyst, thereby reducing the photocatalytic performance.

Method used

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  • Preparation method of laminar-card-structure bisumth tungstate microcrystals
  • Preparation method of laminar-card-structure bisumth tungstate microcrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) The analytically pure sodium tungstate dihydrate Na 2 WO 4 2H 2 O was added to deionized water to make a transparent solution A with a concentration of 0.037mol / L;

[0019] 2) At room temperature, add analytically pure bismuth nitrate pentahydrate Bi(NO 3 ) 3 ·5H 2 O, stir evenly so that the molar ratio of W / Bi in the solution is 1.3:2 to obtain solution B;

[0020] 3) Use NaOH solution with a concentration of 2mol / L to adjust the pH of solution B to 3.8 to obtain white suspension C;

[0021] 4) Pour the solution C into the hydrothermal reaction kettle, control the filling degree to 50%, the temperature of the hydrothermal reaction is 120°C, and the reaction time is 20h;

[0022] 5) Open the hydrothermal reaction kettle, the product is collected by centrifugation, and then washed twice with deionized water and absolute ethanol respectively, and dried at 40°C in an electric blast drying oven to obtain the final product with a sheet-like card structure Bi 2 WO ...

Embodiment 2

[0024] 1) The analytically pure sodium tungstate dihydrate Na 2 WO 4 2H 2 O was added to deionized water to make a transparent solution A with a concentration of 0.073mol / L;

[0025] 2) At room temperature, add analytically pure bismuth nitrate pentahydrate Bi(NO 3 ) 3 ·5H 2 O, stir evenly so that the molar ratio of W / Bi in the solution is 1.4:2 to obtain solution B;

[0026] 3) Adjust the pH of solution B to 4 with NaOH solution with a concentration of 4mol / L to obtain white suspension C;

[0027] 4) Pour the solution C into the hydrothermal reaction kettle, control the filling degree to 60%, the temperature of the hydrothermal reaction is 140°C, and the reaction time is 16h;

[0028] 5) Open the hydrothermal reaction kettle, the product is collected by centrifugation, and then washed three times with deionized water and absolute ethanol respectively, and dried at 60°C in an electric blast drying oven to obtain the final product sheet-like card structure Bi 2 WO 6 Mic...

Embodiment 3

[0030] 1) The analytically pure sodium tungstate dihydrate Na 2 WO 4 2H 2 O was added to deionized water to make a transparent solution A with a concentration of 0.146mol / L;

[0031] 2) At room temperature, add analytically pure bismuth nitrate pentahydrate Bi(NO 3 ) 3 ·5H 2 O, stir evenly so that the molar ratio of W / Bi in the solution is 1.5:2 to obtain solution B;

[0032] 3) Use NaOH solution with a concentration of 6mol / L to adjust the pH of solution B to 4.5 to obtain white suspension C;

[0033] 4) Pour the solution C into the hydrothermal reaction kettle, control the filling degree to 70%, the temperature of the hydrothermal reaction is 160°C, and the reaction time is 12h;

[0034] 5) Open the hydrothermal reaction kettle, the product is collected by centrifugation, and then washed 4 times with deionized water and absolute ethanol respectively, and dried at 70°C in an electric blast drying oven to obtain the final product sheet-like card structure Bi 2 WO 6 Mic...

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Abstract

The invention relates to a preparation method of laminar-card-structure bisumth tungstate microcrystals, which comprises the following steps: adding sodium tungstate dihydrate into deionized water to obtain a solution A; adding bismuth nitrate pentahydrate into the solution A to obtain a solution B; regulating the pH value of the solution B to 3.8-5.2 with an NaOH solution to obtain a white suspension C; pouring the solution C into a hydrothermal reaction kettle to carry out hydrothermal reaction, opening the hydrothermal reaction kettle after the reaction finishes, collecting the product by centrifugal separation, respectively washing with deionized water and anhydrous alcohol, and drying to obtain the end product laminar-card-structure Bi2WO6 microcrystals. By using the hydrothermal preparation technique, the method provided by the invention has the advantage of low energy consumption and favorable product crystallinity, and can complete the reaction in the liquid phase at one time without any after-treatment. The Bi2WO6 microcrystals prepared by the method are in a laminar card structure, have excellent photocatalytic performance, and can quickly degrade rhodamine B under the irradiation of natural sunlight (the degradation rate after 2 hours reaches 95%).

Description

technical field [0001] The invention belongs to a method for preparing bismuth tungstate, in particular to a method for preparing bismuth tungstate microcrystals with a sheet-like card structure. Bi prepared by this method 2 WO 6 It has high photocatalytic performance under natural sunlight irradiation. technical background [0002] As we all know, the shape of materials has an important impact on the performance, so the preparation of materials with controllable shape and size has become a research hotspot in recent years. At present, nano-microstructure materials with various shapes have been prepared, such as low-dimensional structures (wires, rods, ribbons, tubes) and layered structures (dendritic, sea urchin, hollow spheres, flowers). Researchers have synthesized Bi with different morphologies by different methods. 2 WO 6 . Xu et al. synthesized Bi by solvothermal method using ethylene glycol solvent as the medium. 2 WO 6 Nanoparticles [XU C X, WEI X, REN Z H, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
Inventor 黄剑锋卓艺乔曹丽云吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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