A kind of bismuth tungstate/bismuth phosphate composite thin film and its preparation method and application

A composite film, bismuth phosphate technology, applied in chemical instruments and methods, chemical/physical processes, light water/sewage treatment, etc., to achieve the effects of improving degradation efficiency, separation efficiency, and film uniformity

Active Publication Date: 2019-07-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bi has not yet been prepared by a sol-gel method 2 WO 6 / BiPO 4 Composite film related reports

Method used

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  • A kind of bismuth tungstate/bismuth phosphate composite thin film and its preparation method and application
  • A kind of bismuth tungstate/bismuth phosphate composite thin film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: The raw material Na 2 WO 4 Dissolve in ethylene glycol, prepare a 0.30mol / L solution, record it as solution A, add Bi(NO 3 ) 3 Dissolve in ethylene glycol and prepare a 0.60mol / L solution, denoted as solution B. According to the molar ratio of Bi to W of 2:1, add solution A to solution B slowly and stir vigorously to make it 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; Bi 2 WO 6 The precursor solution is allowed to stand for 12h to obtain colorless and clear Bi 2 WO 6 Sol (remains colorless and clear after aging);

[0039] Step 2: Clean the cut FTO glass substrate and irradiate it under ultraviolet light to make the surface of the FTO glass substrate achieve atomic cleanliness;

[0040] Step 3: Spin coating Bi on the clean FTO glass substrate by spin coating 2 WO 6 Sol, the homogenization speed is 4000r / min, the homogenization time is 8s, and Bi 2 WO 6 Wet film. Will Bi 2 WO 6 The wet ...

Embodiment 2

[0046] Step 1: The raw material Na 2 WO 4 Dissolve in ethylene glycol, prepare a 0.30mol / L solution, record it as solution A, add Bi(NO 3 ) 3 Dissolve in ethylene glycol and prepare a 0.60mol / L solution, denoted as solution B. According to the molar ratio of Bi to W as 2:1, add solution A to solution B slowly and stir vigorously to make it colorless Clarified Bi 2 WO 6 Solution, continue to stir for 1.1h to make it evenly mixed to obtain Bi 2 WO 6 Precursor solution; Bi 2 WO 6 The precursor solution is allowed to stand for 12h to obtain colorless and clear Bi 2 WO 6 Sol (remains colorless and clear after aging);

[0047] Step 2: Clean the cut FTO glass substrate and irradiate it under ultraviolet light to make the surface of the FTO glass substrate achieve atomic cleanliness;

[0048] Step 3: Spin coating Bi on the clean FTO glass substrate by spin coating 2 WO 6 Sol, the homogenization speed is 3900r / min, the homogenization time is 7s, and Bi 2 WO 6 Wet film. Will Bi 2 WO 6 The we...

Embodiment 3

[0054] Step 1: The raw material Na 2 WO 4 Dissolve in ethylene glycol, prepare a 0.28mol / L solution, record it as solution A, add Bi(NO 3 ) 3 Dissolve in ethylene glycol and prepare a 0.56mol / L solution, denoted as solution B, according to the molar ratio of Bi to W of 2:1, slowly drop solution A into solution B and stir vigorously to make it 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; Bi 2 WO 6 The precursor solution is allowed to stand for 11.5h to obtain colorless and clear Bi 2 WO 6 Sol (remains colorless and clear after aging);

[0055] Step 2: Clean the cut FTO glass substrate and irradiate it under ultraviolet light to make the surface of the FTO glass substrate achieve atomic cleanliness;

[0056] Step 3: Spin-coating Bi on the clean FTO glass substrate by spin-coating 2 WO 6 Sol, the homogenization speed is 3800r / min, the homogenization time is 7.5s, and Bi 2 WO 6 Wet film. Will Bi 2 WO 6...

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Abstract

The invention discloses a bismuth tungstate / bismuth phosphate composite thin film, a preparation method and an application thereof. The preparation method includes the steps of: layerwise spin-coating a substrate with Bi2WO6 sol and performing annealing, and when the thickness of the Bi2WO6 thin film reaches a certain value, layerwise spin-coating the Bi2WO6 thin film with BiPO4 sol and performing annealing at certain temperature to prepare the Bi2WO6 / BiPO4 composite thin film. The method employs a sol-gel process, is simple in demand on equipment and has mild experiment conditions. The prepared sol can remain stable for a long time, wherein concentration of the sol is accurately controllable. The Bi2WO6 / BiPO4 composite thin film, under simulated sunlight, can generate photo-response current being 1.423-2.649 mA / cm<2>, which is higher than that of Bi2WO6 thin film and BiPO4 thin film by 2-3 times. The Bi2WO6 / BiPO4 composite thin film has a wide application prospect in the field of photocatalysis.

Description

Technical field [0001] The invention belongs to the field of functional materials and relates to a Bi 2 WO 6 / BiPO 4 Composite film and its preparation method and application. Background technique [0002] Bi 2 WO 6 The forbidden band width is about 2.7eV, and it has good visible light response. It is a new type of visible light catalytic material that can be used to degrade organic pollutants in industrial wastewater. Bi 2 WO 6 When irradiated by visible light, electrons can transition from the valence band to the conduction band, leaving vacancies in the valence band, photo-generated electrons and holes and O 2 And surface OH - Combines to form oxidizing superoxide radical·O 2 - And hydroxyl radicals·OH, etc., superoxide radicals and hydroxyl radicals can decompose organic molecules in water to achieve the effect of degradation. 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 parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/188C02F1/30C02F101/30
CPCY02W10/37
Inventor 谈国强苏宇宁许驰赵程程夏傲
Owner SHAANXI UNIV OF SCI & TECH
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