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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 film and its preparation method and application. Bi is first spin-coated layer by layer on the substrate. 2 WO 6 sol and annealed, when Bi 2 WO 6 After the film reaches a certain thickness, BiPO is spin-coated layer by layer. 4 Sol and anneal at a certain temperature to obtain Bi 2 WO 6 / BiPO 4 Composite film. The present invention adopts the sol-gel process, has 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 bismuth tungstate / bismuth phosphate composite film has good performance under simulated sunlight. 1.423~2.649mA / cm 2 Photoresponse current, Bi 2 WO 6 Films and BiPO 4 The photoresponse current of the film is 2 to 3 times higher. Bi prepared by the present invention 2 WO 6 / BiPO 4 Composite films have broad application prospects 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
CPCC02F1/30B01J27/188C02F2305/10C02F2101/30B01J35/23B01J35/59B01J35/39Y02W10/37
Inventor 谈国强苏宇宁许驰赵程程夏傲
Owner SHAANXI UNIV OF SCI & TECH
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