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Method for preparing bismuth tungstate film in sol-gel method

A sol-gel method, bismuth tungstate technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of low utilization rate of sunlight, large forbidden band width, etc., and meet the requirements of low experimental conditions, Simple operation and short preparation cycle

Active Publication Date: 2012-07-11
JIANGSU CASHIDA TRANSMISSION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional photocatalyst titanium dioxide (TiO 2 ) has a large band gap (3.2eV), and has photocatalytic activity only under ultraviolet light irradiation, and the utilization rate of sunlight is not high

Method used

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  • Method for preparing bismuth tungstate film in sol-gel method
  • Method for preparing bismuth tungstate film in sol-gel method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Select the FTO / glass substrate as the substrate, and place the cut FTO substrate in detergent, acetone, and ethanol for ultrasonic cleaning for 10 minutes each to remove impurities such as grease on the surface of the FTO / glass substrate; Finally, rinse the substrate with a large amount of distilled water, and finally dry it with nitrogen;

[0032] Step 2: Place the clean FTO substrate in an ultraviolet irradiator for 5-30 minutes to make the surface of the substrate reach "atomic cleanliness". The high energy of ultraviolet radiation can break the Sn-O bond in it, forming a hydroxyl group with better hydrophilicity, and improving the hydrophilicity of the substrate;

[0033] Step 3: Weigh Na at a molar ratio of 1:2.1 2 WO 4 2H 2 O and Bi(NO 3 ) 3 ·5H 2 O (due to the volatilization of Bi oxide during heating), the Na 2 WO 4 2H 2 O and an excess of 5% Bi(NO 3 ) 3 ·5H 2 O was dissolved in ethylene glycol respectively, and Bi(NO 3 ) 3 ·5H 2 O and Na ...

Embodiment 2

[0037] Step 1: Select the FTO / glass substrate as the substrate, and place the cut FTO substrate in detergent, acetone, and ethanol for ultrasonic cleaning for 10 minutes each to remove impurities such as grease on the surface of the FTO / glass substrate; Finally, rinse the substrate with a large amount of distilled water, and finally dry it with nitrogen;

[0038] Step 2: Place the clean FTO substrate in an ultraviolet irradiator for 5-30 minutes to make the surface of the substrate reach "atomic cleanliness". The high energy of ultraviolet radiation can break the Sn-O bond in it, forming a hydroxyl group with better hydrophilicity, and improving the hydrophilicity of the substrate;

[0039] Step 3: Weigh Na at a molar ratio of 1:2.1 2 WO 4 2H 2 O and Bi(NO 3 ) 3 ·5H 2 O (due to the volatilization of Bi oxide during heating), the Na 2 WO 4 2H 2 O and an excess of 5% Bi(NO 3 ) 3 ·5H 2 O was dissolved in ethylene glycol respectively, and Bi(NO 3 ) 3 ·5H 2 O and Na ...

Embodiment 3

[0043] Step 1: Select the FTO / glass substrate as the substrate, and place the cut FTO substrate in detergent, acetone, and ethanol for ultrasonic cleaning for 10 minutes each to remove impurities such as grease on the surface of the FTO / glass substrate; Finally, rinse the substrate with a large amount of distilled water, and finally dry it with nitrogen;

[0044] Step 2: Place the clean FTO substrate in an ultraviolet irradiator for 5-30 minutes to make the surface of the substrate reach "atomic cleanliness". The high energy of ultraviolet radiation can break the Sn-O bond in it, forming a hydroxyl group with better hydrophilicity, and improving the hydrophilicity of the substrate;

[0045] Step 3: Weigh Na at a molar ratio of 1:2.1 2 WO 4 2H 2 O and Bi(NO 3 ) 3 ·5H 2 O (due to the volatilization of Bi oxide during heating), the Na 2 WO 4 2H 2 O and an excess of 5% Bi(NO 3 ) 3 ·5H 2 O was dissolved in ethylene glycol respectively, and Bi(NO 3 ) 3 ·5H 2 O and Na ...

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Abstract

The invention provides a method for preparing bismuth tungstate film photochemical catalyst in a sol-gel method, which uses five-water bismuth nitrate and two-water sodium tungstate as raw materials. The five-water bismuth nitrate and the two-water sodium tungstate are respectively dissolved in ethylene glycol solvent, magnetic stirring is conducted on the five-water bismuth nitrate and the two-water sodium tungstate at the room temperate and the temperature of 80 DEG C respectively so as to enable the five-water bismuth nitrate and the two-water sodium tungstate to be dissolved to form solution A and solution B, the solution A is added in the solution B, a complexing agent of citric acid and a stabilizing agent of acetylacetone are added in the solution B to be stirred continuously so as to enable the raw materials to be mixed evenly, and a stable Bi2WO6 precursor is obtained. A film is prepared by using a dip-coating method, lifting speed is 3cm / min, the film is dried for 30 min at the temperature of 80 DEG C after lifting is finished, and annealing is performed for 100-200 min at the temperature of 450-500 DEG C after 15-20 times of lifting. The method is simple in preparation process, low in temperature during the process and short in period. The prepared film is uniform and compact.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a method for preparing a bismuth tungstate film by a sol-gel method. Background technique [0002] Since the 1970s, heterogeneous photocatalytic technology has attracted much attention and developed rapidly. Photocatalytic technology has broad application prospects in the fields of environmental pollutant treatment, photolysis of water to produce hydrogen, and solar cells. [0003] The traditional photocatalyst titanium dioxide (TiO 2 ) has a large band gap (3.2eV), and has photocatalytic activity only under ultraviolet light irradiation, and the utilization rate of sunlight is not high. A novel photocatalyst bismuth tungstate (Bi 2 WO 6 ) and TiO 2 Compared to Bi 2 WO 6 The bandgap width is narrow, and it has good visible light response, high stability and environmental friendliness. In 1999, Kudo et al first reported the use of Bi 2 WO 6 Successful splitting of water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/22C01G41/00
Inventor 谈国强宋丽花
Owner JIANGSU CASHIDA TRANSMISSION TECH CO LTD
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