Method for improving photocatalytic activity of bismuth tungstate through excessive Bi source

A photocatalyst, trace technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as unfavorable catalyst recycling and utilization

Inactive Publication Date: 2013-03-27
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the Ag / Bi 2 WO 6 One-step preparation, but the product is nanoparticles, which is not conducive to catalyst recycling

Method used

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  • Method for improving photocatalytic activity of bismuth tungstate through excessive Bi source
  • Method for improving photocatalytic activity of bismuth tungstate through excessive Bi source
  • Method for improving photocatalytic activity of bismuth tungstate through excessive Bi source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 0.4075 g (0.84 mmol) Bi(NO 3 ) 3 ·5H 2 Add 7 mL of distilled water to 25 mL of polytetrafluoroethylene lining and stir magnetically, then weigh 0.1319 g (0.40 mmol) of Na 2 WO 4 2H 2 O and dissolved in 10mL of water, then drop it into the above Bi(NO 3 ) 3 the precursor solution. After continuing to stir for 30 min, the resulting white suspension was hydrothermally reacted at 160 °C for 12 h. After naturally cooling to room temperature, the product was centrifuged, washed and dried to obtain a pale yellow photocatalyst powder with a Bi:W molar ratio of 2.1:1. By adjusting the molar ratio of the reactants and repeating the above operations, a series of Bi and W with different molar ratios can be obtained 2 WO 6 base photocatalyst.

Embodiment 2

[0046] Weigh 0.4463 g (0.92mmol) Bi(NO 3 ) 3·5H 2 Add 7mL of distilled water to 25mL of polytetrafluoroethylene lining and stir magnetically, then weigh 0.1319g (0.4mmol) of Na 2 WO 4 2H 2 O and dissolved in 10mL of water, then drop it into the above Bi(NO 3 ) 3 the precursor solution. After continuing to stir for 30 min, the resulting white suspension was hydrothermally reacted at 180 °C for 12 h. After naturally cooling to room temperature, the product was centrifuged, washed and dried to obtain a pale yellow photocatalyst powder with a Bi:W molar ratio of 2.3:1. By adjusting the molar ratio of the reactants and repeating the above operations, a series of Bi and W with different molar ratios can be obtained 2 WO 6 base photocatalyst.

Embodiment 3

[0047] Embodiment 3 preparation method is the same as embodiment 1, the method for 2

[0048]

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Abstract

The invention discloses a method for improving the photocatalytic activity of bismuth tungstate through an excessive Bi source. Through adjusting the raw material mole ratio of Bi (NO3) 3.5 H2O and Na2WO4.2 H2O, a series of photocatalysts with different mole ratios of Bi / W are prepared by using a simple hydrothermal method implemented without any organic molecule additives, and the performances of the photocatalysts on playing a catalytic oxidation role on dye rhodamine B under simulated sunlight irradiation are studied. Results show that when the Bi source is excessive, the performances of the photocatalysts are improved at different levels; and X-ray diffraction results show that when the Bi source is excessive, besides a Bi2WO6 matrix, trace bismuth subnitrate Bi6O6 (OH) 3 (NO3) 3.1.5 H2O also can be obtained, and the appearance of a sample is integrally of a sheet hypersphere structure, but the rigidity and the assembling density of a sheet layer are higher than those of pure Bi2WO6, and the thickness of the sheet layer is obviously thinner than that of the Bi2WO6 by 15-30nm. Fluorescence tests show that the recombination probability of a photon-generated carrier of a sample with the excessive Bi source is really and effectively inhibited.

Description

[0001] This application is supported by the Science and Technology Development Fund of Tianjin Colleges and Universities (20090503). technical field [0002] The invention belongs to the technical field of environmental protection, and relates to a method for improving the photocatalytic activity of bismuth tungstate through excessive bismuth sources. Background technique [0003] The wastewater produced by industrial production such as papermaking, printing and dyeing has posed a serious threat to the living environment of human beings. However, currently commonly used industrial water treatment technologies, such as biochemical methods and precipitation methods, are difficult to completely degrade industrial wastewater. Therefore, how to effectively control industrial wastewater has become one of the problems faced by human beings and urgently to be solved. Photocatalytic oxidation technology has become a key technology to solve the problem of environmental water pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J35/08B01J37/10C02F1/30C02F103/28C02F103/30
CPCY02W10/37
Inventor 张国英冯妍吴青松高东昭
Owner TIANJIN NORMAL UNIVERSITY
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