Preparation method of bismuth tungstate-titanium dioxide heterojunction composite photocatalysis material

A composite photocatalysis and titanium dioxide technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. The effect of improvement, good controllability and simple preparation process

Active Publication Date: 2015-05-13
YANAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes an efficient way for making photoactive materials with both ceria (CeO2) nanoparticles or Ti02 particles attached thereto by combining them together at once during chemical reaction called Hydrothermally Synthesis. These composites have excellent properties such as high efficiency towards UV ray absorption due to their small size but also improve visibility when exposed to sunlight without losing any coloring caused by oxidizing agents like oxygen gas molecules on top.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to improve the use of solar cells due to their ability to convert incident lights into electrical current without being affected by external factors like temperature changes. Current techniques involve either mixing different parts together or adding an adhesive agent between these components before applying each component onto another substrate.

Method used

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  • Preparation method of bismuth tungstate-titanium dioxide heterojunction composite photocatalysis material
  • Preparation method of bismuth tungstate-titanium dioxide heterojunction composite photocatalysis material
  • Preparation method of bismuth tungstate-titanium dioxide heterojunction composite photocatalysis material

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Embodiment 1

[0029] Step 1: Weigh 0.98g Bi(NO 3 ) 3 ·5H 2 O solid, dissolve it in the prepared 20mL, 0.4mol / L HNO 3 solution, stirred at 40°C until Bi(NO 3 ) 3 ·5H 2 O dissolved, then added 10mL, 25g / L (NH 4 ) 10 W 12 o 41 ·5H 2 O aqueous solution, after continuous stirring for 2h, liquid a was obtained;

[0030] Step 2: Add 4mL C 16 h 36 o 4 Ti and 16mL CH 3 CH 2 OH was mixed to obtain liquid b, which was added dropwise with 1.5mL CH under stirring 3 COOH, 1ml distilled water and 5ml CH 3 CH 2 In liquid c mixed with OH, continue to stir for 20 minutes after dripping, then take 1 / 9 of the volume of liquid a to mix with it, continue to stir for 30 minutes, transfer the mixed liquid into a hydrothermal reaction kettle, seal the kettle, put it into an electric heating constant temperature blast React in a drying oven at 180°C for 15h. After the reaction, centrifuge and precipitate, wash, vacuum dry (dry at 80°C for 16h), and grind to obtain a powdered bismuth tungstate-titan...

Embodiment 2

[0032] Step 1: Weigh 0.98g Bi(NO 3 ) 3 ·5H 2 O solid, dissolve it in the prepared 20mL, 0.4mol / L HNO 3 solution, stirred at 40 °C until solid Bi(NO 3 ) 3 ·5H 2 O dissolved, followed by adding 10mL, 25g / L (NH 4 ) 10 W 12 o 41 ·5H 2 O aqueous solution, after continuous stirring for 2.5h, liquid a was obtained;

[0033] Step 2: Add 4mL C 16 h 36 o 4 Ti and 16mL CH 3 CH 2 OH was mixed to obtain liquid b, which was added dropwise with 1.5mL CH under stirring 3 COOH, 1ml distilled water and 5ml CH 3 CH 2 In liquid c mixed with OH, continue to stir for 40 minutes after dripping, then take 5 / 9 of the volume of liquid a to mix with it, continue to stir for 1 hour, transfer the mixed liquid into a hydrothermal reaction kettle, seal the kettle, and put it into an electric heating constant temperature blast React in a drying oven at 200°C for 10h. After the reaction, centrifuge and precipitate, wash, vacuum dry (100°C for 12h), and grind to obtain powdered bismuth tungst...

Embodiment 3

[0035] Step 1: Weigh 0.98g Bi(NO 3 ) 3 ·5H 2 O solid, dissolve it in the prepared 20mL, 0.4mol / L HNO 3 solution, stirred at 40 °C until solid Bi(NO 3 ) 3 ·5H 2 O dissolved, then added 10mL, 25g / L (NH 4 ) 10 W 12 o 41 ·5H 2 O aqueous solution, after continuous stirring for 2h, liquid a was obtained;

[0036] Step 2: Add 4mL C 16 h 36 o 4 Ti and 16mL CH 3 CH 2 OH was mixed to obtain liquid b, which was added dropwise with 1.5mL CH under stirring 3 COOH, 1ml distilled water and 5mL CH 3 CH 2 In liquid c mixed with OH, continue to stir for 30 minutes after dripping, then take liquid a to mix with it, continue to stir for 1.5 hours, transfer the mixed liquid into a hydrothermal reaction kettle, seal the kettle, and put it in an electric heating constant temperature blast drying box for 190 React at ℃ for 12 hours. After the reaction, centrifuge to separate the precipitate, wash, vacuum dry (100 ℃ for 12 hours), and grind to obtain powdered bismuth tungstate-titani...

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Abstract

The invention discloses a preparation method of a bismuth tungstate-titanium dioxide heterojunction composite photocatalysis material. The method comprises the steps of preparing TiO2 sol and a Bi2WO6 precursor solution, then mixing the TiO2 sol and the Bi2WO6 precursor solution to obtain a mixed solution, placing the mixed solution in a hydrothermal reaction kettle, and synthesizing the Bi2WO6 and TiO2 heterojunction composite photocatalysis material in one step by adopting a hydrothermal method. By adopting the preparation method, the synthetic procedures of the composite photocatalysis material can be greatly simplified, and simplicity in operation and easiness in control can be realized; moreover, the visible-light catalytic activity of the prepared tungstate-titanium dioxide heterojunction composite photocatalysis material is remarkably improved compared with those of bismuth tungstate and titanium dioxide.

Description

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Claims

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Application Information

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Owner YANAN UNIV
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