Porous lamellar-structured bismuth tungstate film as well as preparation method and application thereof

A network structure, bismuth tungstate technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of poor recycling performance, low recovery rate of small-sized particles, etc., and achieve improved film uniformity and high gloss. The effect of easy current and experimental conditions

Active Publication Date: 2017-06-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing Bi 2 WO 6 The material is a powder material. In the photodegradation experiment, nano-Bi 2 WO 6 The photocatalytic effect of particles is relatively good, but the recovery rate of small-sized particles is very low, and the recycling performance is poor

Method used

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  • Porous lamellar-structured bismuth tungstate film as well as preparation method and application thereof
  • Porous lamellar-structured bismuth tungstate film as well as preparation method and application thereof
  • Porous lamellar-structured bismuth tungstate film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Step 1: the raw material Na 2 WO 4 Dissolved in ethylene glycol, prepared into a 0.30mol / L solution, recorded as solution A, Bi(NO 3 ) 3 Dissolved in ethylene glycol, prepared into a 0.60mol / L solution, recorded as solution B, according to the molar ratio of Bi to W of 2:1, slowly added solution A into solution B and vigorously stirred to form a colorless Clarified Bi 2 WO 6 solution, continue to stir for 1h to make it evenly mixed to obtain Bi 2 WO 6 Precursor solution; the Bi 2 WO 6 The precursor solution was left standing for 12h to obtain a colorless and clear Bi 2 WO 6 Sol (remains colorless and clear after aging);

[0031] Step 2: Place the cut FTO glass substrate in detergent, acetone, and ethanol in sequence for ultrasonic cleaning, rinse with a large amount of distilled water after each ultrasonic cleaning for 10 minutes, and finally blow dry with nitrogen, and then put the FTO glass substrate in After drying in an oven and standing to room temperatur...

Embodiment 2

[0035] Step 1: the raw material Na 2 WO 4 Dissolved in ethylene glycol, prepared into a 0.30mol / L solution, recorded as solution A, Bi(NO 3 ) 3 Dissolved in ethylene glycol, prepared into a 0.60mol / L solution, recorded as solution B, according to the molar ratio of Bi to W of 2:1, slowly added solution A into solution B and vigorously stirred to form a colorless Clarified Bi 2 WO 6 solution, continue to stir for 1.1h to make it evenly mixed, and obtain Bi 2 WO 6 Precursor solution; the Bi 2 WO 6 The precursor solution was left standing for 12h to obtain a colorless and clear Bi 2 WO 6 Sol (remains colorless and clear after aging);

[0036] Step 2: Place the cut FTO glass substrate in detergent, acetone, and ethanol in sequence for ultrasonic cleaning, rinse with a large amount of distilled water after each ultrasonic cleaning for 10 minutes, and finally blow dry with nitrogen, and then put the FTO glass substrate in After drying in an oven and standing to room tempe...

Embodiment 3

[0040] Step 1: the raw material Na 2 WO 4 Dissolved in ethylene glycol, prepared into a 0.28mol / L solution, recorded as solution A, Bi(NO 3 ) 3 Dissolved in ethylene glycol, prepared into a 0.56mol / L solution, recorded as solution B, according to the molar ratio of Bi to W of 2:1, slowly added solution A into solution B and vigorously stirred to form a colorless Clarified Bi 2 WO 6 solution, continue to stir for 1.2h to make it evenly mixed to obtain Bi 2 WO 6 Precursor solution; the Bi 2 WO 6 The precursor solution was left standing for 11.5h to obtain a colorless and clear Bi 2 WO 6 Sol (remains colorless and clear after aging);

[0041] Step 2: Place the cut FTO glass substrate in detergent, acetone, and ethanol in sequence for ultrasonic cleaning, rinse with a large amount of distilled water after each ultrasonic cleaning for 10 minutes, and finally blow dry with nitrogen, and then put the FTO glass substrate in After drying in an oven and standing to room tempe...

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Abstract

The invention discloses a porous lamellar-structured bismuth tungstate film as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively dissolving Na2WO4 and Bi(NO3)3 into glycol so as to prepare a solution A with a certain concentration and a solution B with a certain concentration, dropwise adding the solution A into the solution B so as to obtain a precursor solution, and ageing the precursor solution, so as to obtain colorless and clarified sol; and preparing a Bi2WO6 film with a uniform, narrow and long duct net structure on an FTO glass substrate by virtue of a spin-coating method and a layer-by-layer annealing process. According to the preparation method, a sol-gel process is adopted, equipment requirements are simple, experimental conditions are mild, the stability of the prepared soil can be preserved for a long time, the concentration of the sol is accurate and controllable, and the prepared Bi2WO6 film has a light current of 0.84mA / cm<2> in the moment of visible light illumination and has wide application prospects in the photocatalysis field.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to the preparation of Bi with a porous network structure on the surface of a functionalized substrate. 2 WO 6 thin film method. Background technique [0002] Bi 2 WO 6 The bandgap width is about 2.7eV, and it has good visible light response. It is a new type of visible light catalytic material and can be used to degrade organic pollutants in industrial wastewater. Bi 2 WO 6 When irradiated by visible light, electrons can jump from the valence band to the conduction band, leaving vacancies in the valence band, photogenerated electrons and holes and O 2 and surface OH - combined to form oxidative superoxide radicals O 2 - Superoxide radicals and hydroxyl radicals can decompose organic molecules in water to achieve the effect of degradation. Bi 2 WO 6 It was first synthesized by the Japanese scholar Kudo in 1999 by a solid-phase method, but due to the large particle size an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B01J23/30B01J35/10C02F1/30C02F101/30
CPCY02W10/37C01G41/00B01J23/30B01J35/10C01P2002/72C01P2004/03C02F1/30C02F2101/30C02F2305/10
Inventor 谈国强苏宇宁许驰赵程程任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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