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A kind of bismuth tungstate film with porous network structure and its preparation method and application

A network structure, bismuth tungstate technology, applied in chemical instruments and methods, tungsten compounds, physical/chemical process catalysts, etc., can solve the problems of poor recycling performance and low recovery rate of small-sized particles, and achieve film uniformity Improvement, high photocurrent, simple equipment requirements

Active Publication Date: 2018-09-18
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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  • A kind of bismuth tungstate film with porous network structure and its preparation method and application
  • A kind of bismuth tungstate film with porous network structure and its preparation method and application
  • A kind of bismuth tungstate film with porous network structure and its preparation method and application

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Experimental program
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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 bismuth tungstate film with a porous network structure and its preparation method and application. Na2WO4 and Bi(NO3)3 are dissolved in ethylene glycol respectively to prepare solution A and solution B of a certain concentration. The solution is A is added dropwise to solution B to obtain a precursor solution, and a colorless and clear sol is obtained after the precursor solution is aged. Bi2WO6 thin films with uniform narrow channel network structure were prepared on FTO glass substrates by spin coating and layer-by-layer annealing processes. The present invention adopts a sol-gel process with simple equipment requirements and mild experimental conditions. The prepared sol can remain stable for a long time and the sol concentration is accurately controllable. The prepared Bi2WO6 film has a photocurrent of 0.84mA / cm2 at the moment of illumination under visible light. , the prepared Bi2WO6 film has broad application prospects in the field of photocatalysis.

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 Patents(China)
IPC IPC(8): C01G41/00B01J23/30B01J35/10C02F1/30C02F101/30
CPCC01G41/00C02F1/30B01J23/30C02F2101/30C01P2004/03C01P2002/72C02F2305/10B01J35/60Y02W10/37
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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