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Microspheric three-dimensional grading micro-nano structure bismuth tungstate photocatalytic material and preparation method thereof

A technology of hierarchical micro-nano structure and photocatalytic materials, applied in the field of catalytic materials research, can solve the problems of limited contact area between pollutants and catalysts, reduce photocatalytic activity, organic waste liquid pollution, etc., and achieve enhanced photocatalytic activity and reaction conditions. Easy to control, prevent agglomeration effect

Inactive Publication Date: 2016-07-13
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Granular and flaky bismuth tungstate structures are usually very easy to agglomerate, and the dispersion is not good, resulting in a greatly limited contact area between pollutants and the catalyst, reducing its photocatalytic activity, and some methods require the use of organic solvents, which will cause organic waste liquid contamination

Method used

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  • Microspheric three-dimensional grading micro-nano structure bismuth tungstate photocatalytic material and preparation method thereof
  • Microspheric three-dimensional grading micro-nano structure bismuth tungstate photocatalytic material and preparation method thereof
  • Microspheric three-dimensional grading micro-nano structure bismuth tungstate photocatalytic material and preparation method thereof

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Embodiment 1

[0033] In this embodiment, the method for preparing a microspherical three-dimensional hierarchical micro-nano structure bismuth tungstate photocatalytic material is realized by the following steps:

[0034] (1) Disperse 0.825g of sodium tungstate dihydrate and 2.425g of bismuth nitrate pentahydrate evenly in 40mL of deionized water, respectively, ultrasonically oscillate for 15min, and stir to obtain sodium tungstate solution and bismuth nitrate solution respectively;

[0035] (2) Add the sodium tungstate solution to the bismuth nitrate solution drop by drop, the molar ratio of sodium tungstate and bismuth nitrate is 1:3, add nitric acid to adjust the pH to 1, react in the reaction kettle at 180°C for 18 hours, wait After the reaction solution was naturally cooled to room temperature, the solid product was isolated;

[0036] (3) The solid product separated in step (2) was washed three times with deionized water and absolute ethanol, and dried at 70° C. to obtain a microspheri...

Embodiment 2

[0040] In this embodiment, the method for preparing a microspherical three-dimensional hierarchical micro-nano structure bismuth tungstate photocatalytic material is realized by the following steps:

[0041] (1) Disperse 0.825g of sodium tungstate dihydrate and 2.425g of bismuth nitrate pentahydrate evenly in 40mL of deionized water, respectively, ultrasonically oscillate for 10min, and stir to obtain sodium tungstate solution and bismuth nitrate solution respectively;

[0042] (2) Add the sodium tungstate solution to the bismuth nitrate solution drop by drop, the molar ratio of sodium tungstate and bismuth nitrate is 1:2, add nitric acid to adjust the pH to 1, and react at 160°C in the reaction kettle for 20 hours, wait After the reaction solution was naturally cooled to room temperature, the solid product was isolated;

[0043] (3) The solid product separated in step (2) was washed three times with deionized water and absolute ethanol respectively, and dried at 80° C. to obt...

Embodiment 3

[0046] In this embodiment, the method for preparing a microspherical three-dimensional hierarchical micro-nano structure bismuth tungstate photocatalytic material is realized by the following steps:

[0047] (1) Disperse 0.825g of sodium tungstate dihydrate and 2.425g of bismuth nitrate pentahydrate evenly in 40mL of deionized water, respectively, ultrasonically oscillate for 12min, and stir to obtain sodium tungstate solution and bismuth nitrate solution respectively;

[0048] (2) Add the sodium tungstate solution to the bismuth nitrate solution drop by drop, the molar ratio of sodium tungstate and bismuth nitrate is 1:4, add nitric acid to adjust the pH to 1, react in the reaction kettle at 150°C for 24 hours, wait After the reaction solution was naturally cooled to room temperature, the solid product was isolated;

[0049] (3) The solid product separated in step (2) was washed three times with deionized water and absolute ethanol, and dried at 75° C. to obtain a microspheri...

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Abstract

The invention relates to a microspheric three-dimensional grading micro-nano structure bismuth tungstate photocatalytic material and a preparation method thereof. The microspheric three-dimensional grading micro-nano structure bismuth tungstate photocatalytic material is of a microspheric structure formed by assembling two-dimensional nanosheets with rough surfaces, is uniformly distributed, and has the microsphere diameter being 2.5 to 3.5mum. The preparation method comprises the following steps of a reacting sodium tungstate solution and a bismuth nitrate solution in a reaction kettle for 8 to 24 hours under the condition that pH is equal to 1 and the temperature is 150 to 200 DEG C, separating to obtain a solid product, washing and drying. The obtained product is good in stability, large in specific surface area, and beneficial to diffusing and transmitting pollutant molecules, and greatly increasing the photocatalytic activity, and in addition, the preparation method is simple, controllable in reaction condition, and low in temperature.

Description

technical field [0001] The invention belongs to the technical field of catalytic material research, in particular to a microspherical three-dimensional hierarchical micro-nano structure bismuth tungstate photocatalytic material and a preparation method thereof. Background technique [0002] Bismuth tungstate is the simplest oxide of the Aurivillius type with a layered structure. As a new type of photocatalytic material, its band gap is about 2.75ev, it has absorption in the visible light region (λ≥420nm), and it has good optical and thermal stability. Therefore, bismuth tungstate has important application value in water pollution treatment and has received more and more attention. Since the performance of the material has a great relationship with its size and shape, the development of bismuth tungstate materials with various morphologies to improve their catalytic performance has become the focus of bismuth tungstate research. [0003] Chinese invention patent CN103101977...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B01J23/31
CPCC01G41/00B01J23/31C01P2004/61C01P2004/32C01P2004/03B01J35/39B01J35/51
Inventor 卢红兵陈天华张金牛刘畅尹峰高健智杨智博刘茜茹
Owner SHAANXI NORMAL UNIV
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