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Bismuth tungstate/carbon nitride/bismuth phosphate composite photocatalyst as well as preparation method and application thereof

A technology of carbon nitride and bismuth phosphate, applied in physical/chemical process catalysts, chemical instruments and methods, water treatment of special compounds, etc., to achieve good adsorption performance, improve separation efficiency, and simple process

Active Publication Date: 2017-06-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bi 2 WO 6 and C 3 N 4 The forbidden band width is small, and the electron-hole recombination is easy to occur. At present, there is no Bi 2 WO 6 、C 3 N 4 and BiPO 4 Combined to make Bi 2 WO 6 / C 3 N 4 / BiPO 4 Related reports on composite photocatalysts

Method used

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  • Bismuth tungstate/carbon nitride/bismuth phosphate composite photocatalyst as well as preparation method and application thereof
  • Bismuth tungstate/carbon nitride/bismuth phosphate composite photocatalyst as well as preparation method and application thereof
  • Bismuth tungstate/carbon nitride/bismuth phosphate composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Step 1: the raw material 3mmol Na 2 WO 4 and 6mmol Bi(NO 3 ) 3 Dissolve in deionized water, stir vigorously for 20min to obtain a white mixed solution, the concentration of Bi element in the mixed solution is 0.133mol / L, ultrasonically disperse the mixed solution in an ultrasonic instrument with a power of 400W for 30min, and then at room temperature with 300rad / L Min speed magnetic stirring for 2 hours, and finally transferred to a hydrothermal reaction kettle with a microwave power of 300W, microwave hydrothermal reaction at 180°C for 1 hour, and a white mixed solution was obtained. The precipitate was washed three times with absolute ethanol and deionized water, and dried at 80 °C for 15 h to obtain white Bi 2 WO 6 Powder;

[0039] Step 2: Weigh melamine and urea respectively according to the mass ratio of 1:1, mix them evenly and add them into deionized water to obtain a mixture, the concentration of melamine and urea in the mixture is 0.333g / mL, and stir the m...

Embodiment 2

[0044] Step 1: the raw material 3mmol Na 2 WO 4 and 6mmol Bi(NO 3 ) 3 Dissolve in deionized water and stir vigorously for 20 minutes to obtain a white mixed solution. The concentration of Bi element in the mixed solution is 0.14mol / L. The mixed solution is ultrasonically dispersed in an ultrasonic instrument with a power of 500W for 20min, and then at room temperature at 200rad / L Magnetically stirred at a speed of min for 3 hours, and finally transferred to a hydrothermal reaction kettle with a microwave power of 300W. Microwave hydrothermal reaction was carried out at 200°C for 0.5 hours to obtain a white mixed solution. The precipitate was washed three times with absolute ethanol and deionized water, and dried at 70 °C for 16 h to obtain white Bi 2 WO 6 Powder;

[0045] Step 2: Weigh melamine and urea respectively according to the mass ratio of 1:1.1, mix them evenly and add them into deionized water to obtain a mixture. The concentration of melamine and urea in the mix...

Embodiment 3

[0050] Step 1: the raw material 3mmol Na 2 WO 4 and 6mmol Bi(NO 3 ) 3 Dissolve in deionized water, stir vigorously for 20min to obtain a white mixed solution, the concentration of Bi element in the mixed solution is 0.145mol / L, ultrasonically disperse the mixed solution in an ultrasonic instrument with a power of 450W for 25min, and then at room temperature with 250rad / L Magnetically stirred at a speed of 2.5 hours, and finally transferred to a hydrothermal reaction kettle with a microwave power of 300W. Microwave hydrothermal reaction was carried out at 190°C for 0.6 hours to obtain a white mixed solution. The mixed solution was left to stand for stratification, and the supernatant was removed. , the precipitate was washed three times with absolute ethanol and deionized water, and dried at 75 °C for 17 h to obtain white Bi 2 WO 6 Powder;

[0051] Step 2: Weigh melamine and urea respectively according to the mass ratio of 1:1.2, mix them evenly and add them into deionized...

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Abstract

The invention discloses a bismuth tungstate / carbon nitride / bismuth phosphate composite photocatalyst as well as a preparation method and an application thereof. The preparation method comprises the following steps: by taking C3N4 powder prepared through cofiring of Bi2WO6 and BiPO4 powder prepared through microwave hydrothermal synthesis, and melamine and urea, as a raw material, and methanol as a solvent, synthesizing a Bi2WO6 / BiPO4 / C3N4 composite photocatalyst by using an ultrasonic method through two steps. The composite powder prepared by using the method is high in crystallinity degree, components form a heterogeneous structure, the composite process is implemented at room temperature, the reaction conditions are gentle, the photocatalytic performance can be remarkably improved, and the photocatalyst has wide application prospects in organic pollutant photocatalytic degradation.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a Bi 2 WO 6 / C 3 N 4 / BiPO 4 Composite photocatalyst and its preparation method and application. Background technique [0002] Bi 2 WO 6 The bandgap width is about 3eV, 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. C 3 N 4 It is also a photocatalytic material with a narrow bandgap, its bandgap width is about 2.7eV, it has a good response to visible light, and it has a lamel...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J27/24C02F2305/10B01J35/39Y02W10/37
Inventor 谈国强苏宇宁许驰赵程程夏傲
Owner SHAANXI UNIV OF SCI & TECH
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