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Iron oxide/bismuth tungstate composite photocatalyst, preparation method thereof and application thereof

A composite light and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low quantum efficiency, narrow visible light absorption range, and effective use of solar energy. The visible light ratio is not ideal enough to achieve the effect of improving the photocatalytic activity and promoting the application potential.

Inactive Publication Date: 2012-12-19
TIANJIN NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0008]However, there are two problems in Bi2WO6 of the single system: one is that Bi 2WO6 has an intrinsic absorption wavelength threshold of only about 460 nm, and its absorption range for visible light is relatively narrow, and the proportion of effective use of solar energy, especially visible light, is still not ideal; The interfacial charge transfer rate from seconds to milliseconds, and the recombination rate of photogenerated carriers in nanoseconds are faster, resulting in relatively low quantum efficiency

Method used

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  • Iron oxide/bismuth tungstate composite photocatalyst, preparation method thereof and application thereof
  • Iron oxide/bismuth tungstate composite photocatalyst, preparation method thereof and application thereof
  • Iron oxide/bismuth tungstate composite photocatalyst, preparation method thereof and application thereof

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Effect test

Embodiment 1

[0054] (1) Flower-like Bi 2 WO 6 Preparation of superstructure: Weigh 0.3881 g (0.8 mmol) Bi(NO 3 ) 3 ·5H 2 O was dissolved in 17 mL of distilled water, and under vigorous magnetic stirring, 0.1319 g (0.4 mmol) of Na 2 WO 4 2H 2 O. After continuing to stir for 30 min, the white suspension was transferred to a 25 mL hydrothermal reactor, and reacted at a constant temperature of 160 °C for 12 h. After natural cooling to room temperature, the product was centrifuged, washed and dried to obtain pale yellow Bi 2 WO 6 Ultrastructured powders (G. Y. Zhang, et. al Mater. Res. Bull. 2012, 47:1919.).

[0055] (2) Fe 2 o 3 Surface modification of nanoparticles, using impregnation-baking technique: weigh 0.1000g of Bi 2 WO 6 Superstructure powder was placed in a 50mL evaporating dish, and 1mL of Fe(NO 3 ) 3 9H 2 O stock solution (1.8 mmol / L), under constant stirring, the mixture was evaporated to dryness under an infrared lamp (temperature 50°C, 10 minutes), and collec...

Embodiment 2

[0057] (1) Flower-like Bi 2 WO 6 Preparation of superstructure: Weigh 0.3881 g (0.8 mmol) Bi(NO 3 ) 3 ·5H 2 O was dissolved in 17 mL of distilled water, and under vigorous magnetic stirring, 0.1319 g (0.4 mmol) of Na 2 WO 4 2H 2 O. After continuing to stir for 30 min, the white suspension was transferred to a 25 mL hydrothermal reactor, and reacted at a constant temperature of 160 °C for 12 h. After natural cooling to room temperature, the product was centrifuged, washed and dried to obtain pale yellow Bi 2 WO 6 Ultrastructured powders (G. Y. Zhang, et. al Mater. Res. Bull. 2012, 47:1919.).

[0058] (2) Fe 2 o 3 Surface modification of nanoparticles, using impregnation-baking technique: weigh 0.1000g of Bi 2 WO 6 Superstructure powder was placed in a 50mL evaporating dish, and 4 mL of Fe(NO 3 ) 3 9H 2 O stock solution (1.8 mmol / L), under constant stirring, the mixture was evaporated to dryness under an infrared lamp (temperature 60°C, 20 minutes), and colle...

Embodiment 3

[0060] (1) Flower-like Bi 2 WO 6 Preparation of superstructure: Weigh 0.3881 g (0.8 mmol) Bi(NO 3 ) 3 ·5H 2 O was dissolved in 17 mL of distilled water, and under vigorous magnetic stirring, 0.1319 g (0.4 mmol) of Na 2 WO 4 2H 2 O. After continuing to stir for 30 min, the white suspension was transferred to a 25 mL hydrothermal reactor, and reacted at a constant temperature of 160 °C for 12 h. After natural cooling to room temperature, the product was centrifuged, washed and dried to obtain pale yellow Bi 2 WO 6 Ultrastructured powders (G. Y. Zhang, et. al Mater. Res. Bull. 2012, 47:1919.).

[0061] (2) Fe 2 o 3 Surface modification of nanoparticles, using impregnation-baking technique: weigh 0.1000g of Bi 2 WO 6 Superstructure powder was placed in a 50mL evaporating dish, and 10mL of Fe(NO 3 ) 3 9H 2 O stock solution (1.8 mmol / L), under constant stirring, the mixture was evaporated to dryness under an infrared lamp (temperature 70°C, 25 minutes), and colle...

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Abstract

The invention discloses an iron oxide / bismuth tungstate composite photocatalyst, a preparation method of the iron oxide / bismuth tungstate composite photocatalyst and the application of the iron oxide / bismuth tungstate composite photocatalyst. The iron oxide / bismuth tungstate composite photocatalyst has a Fe2O3 / Bi2WO6 XRD (X-ray diffraction) diffraction pattern as shown in Figure 1 of the specification and a composite morphology as shown in Figure 2 of the specification. 10-30nm of Fe2O3 nano-particles are precipitated on the surface of Bi2WO6 by a soaking-low temperature roasting technology. The invention represents the change of the structure, the morphology, the ultraviolet-visible absorption spectrum and the fluorescence spectrum of the material before and after being modified in details, and researches the catalytic degradation of the visible light of the iron oxide / bismuth tungstate composite photocatalyst to the activity of the dyestuff rhodamine B (RhB). The result shows that Fe2O3 particles with the mean grain sizes of 20nm are dispersed on the surface of a nanosheet unit of a Bi2WO6 superstructure, the visible light response range of the Fe2O3 / Bi2WO6 composite photocatalyst is obvious in bathochromic shift, and the composition probability of photon-generated carriers can be effectively restrained as well. When the toasting temperature is low temperature of 200DGE C, and the Fe element content is 0.1% (wt%), the photocatalytic activity is optimal, and the efficiency of the visible-light catalytic degradation RhB can be improved by 20% compared with that of the un-composited visible-light catalytic degradation RhB.

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 Fe 2 o 3 against Bi 2 WO 6 surface modification to broaden the Bi 2 WO 6 visible light absorption range, more specifically an Fe 2 o 3 / Bi 2 WO 6 Composite photocatalyst and its preparation method and application. Background technique [0003] The control of environmental pollution is one of the major problems that human beings are facing and need to solve urgently. The purification of environmental pollution by photocatalytic oxidation has attracted much attention due to its advantages of low energy consumption, mild purification conditions, no secondary pollution, and deep oxidation. Among them, the development of photocatalyst is at the core of this technology, which is the key to the efficiency of photocatalytic oxidati...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J35/02C02F1/30C10G29/16A61L2/23C02F101/38A61L101/28
Inventor 张国英冯妍吴青松许艳艳
Owner TIANJIN NORMAL UNIVERSITY
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