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Nanometer photocatalyst bismuth tungstate and preparation method thereof

A nano-photocatalyst, bismuth tungstate technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of grain growth, low product purity, Difficult to realize and other problems, to achieve the effect of good crystallinity, high purity and easy operation

Inactive Publication Date: 2013-06-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrothermal method requires the reaction vessel to withstand high pressure, which is difficult to achieve in industrial production; the reflux method and the sol-gel method require subsequent heat treatment of the product to remove impurities, which is easy to cause grain growth; and the ball milling method requires a higher temperature , and the purity of the obtained product is relatively low
[0004] There is no relevant report about the method for preparing bismuth tungstate by molten salt method

Method used

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  • Nanometer photocatalyst bismuth tungstate and preparation method thereof
  • Nanometer photocatalyst bismuth tungstate and preparation method thereof
  • Nanometer photocatalyst bismuth tungstate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 10mmBi(NO 3 ) 3 ·5H 2 O and 5mmNa 2 WO 4 2H 2 O placed in a mortar and mortar. Weigh 5.24gKNO 3 and 2.63gLiNO 3 Place it in a crucible, heat it to 140°C to melt, and keep it warm for 5 hours. The ground Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 The mixture of O was added into the crucible under the condition of stirring, the temperature was raised to 150° C., and the reaction was carried out for 24 hours. After the reaction, the final product was washed 5-8 times with deionized water and absolute ethanol, and dried at 80° C. for 8 hours to obtain bismuth tungstate powder.

Embodiment 2

[0029] Weigh 10mmBi(NO 3 ) 3 ·5H 2 O and 5mmNa 2 WO 4 2H 2 O placed in a mortar and mortar. Weigh 5.24gKNO 3 and 2.63gLiNO 3 Place it in a crucible, heat it to 140°C to melt, and keep it warm for 4 hours. The ground Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 The mixture of O was added into the crucible under the condition of stirring, the temperature was raised to 240° C. and the temperature was kept, and the reaction was carried out for 8 hours. After the reaction, the final product was washed 5-8 times with deionized water and absolute ethanol, and dried at 80° C. for 8 hours to obtain bismuth tungstate powder. Gained sample is measured as pure orthorhombic bismuth tungstate through XRD, without other impurity peaks (see figure 2 ).

Embodiment 3

[0031] Weigh 10mmBi(NO 3 ) 3 ·5H 2 O and 5mmNa 2 WO 4 2H 2 O placed in a mortar and mortar. Weigh 5.24gKNO 3 and 2.63gLiNO 3 Place in a crucible, heat to 140°C to melt, and keep warm for 3 hours. The ground Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 The mixture of O was added into the crucible under the condition of stirring, the temperature was raised to 200° C. and the temperature was kept, and the reaction was carried out for 15 hours. After the reaction, the final product was washed 5-8 times with deionized water and absolute ethanol, and dried at 80° C. for 8 hours to obtain bismuth tungstate powder. The obtained bismuth tungstate nanoplate thickness is between 30-50 nanometers, and length and width are 500-1000 nanometers (see image 3 ).

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Abstract

The invention discloses a method for preparing nanometer bismuth tungstate by utilizing a fused salt method. According to the method, bismuth nitrate and sodium tungstate are adopted as raw materials, potassium nitrate / sodium nitrate and lithium nitrate are utilized as a fuse salt system, the raw materials are mixed and added into a molten salt system in a crucible, and the nanoscale bismuth tungstate powder is obtained through reaction. According to the method, the uniform mixing of raw material on a molecule scale can be realized, and the nanoscale bismuth tungstate powder with high purity is obtained. The method provided by the invention has the advantages that the equipment is simple, the technological process is short, the operation is simple, the product performance is excellent, and the method has an extensive application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic functional materials, and relates to a photocatalyst and a preparation method thereof, in particular to a method for preparing bismuth tungstate nanopowder by a molten salt method. Background technique [0002] Bismuth tungstate has a bismuth layered structure and has been widely studied in dielectrics, ion conductors, and luminescent materials. Due to its narrow band gap, it has recently attracted great attention in the field of visible light catalysis. Under light conditions, bismuth tungstate can catalyze the decomposition of water to produce hydrogen and oxygen, and can also degrade organic pollutants. The preparation of bismuth tungstate powder with high crystallinity, uniform shape and fine particles plays an extremely important role in improving its photocatalytic performance. [0003] At present, the methods for preparing bismuth tungstate mainly include hydrothermal / solv...

Claims

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Application Information

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IPC IPC(8): B01J23/31
Inventor 王雄蓝燕林颖李柳
Owner NANJING UNIV OF SCI & TECH
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