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A kind of bismuth tungstate/carbon nitride composite photocatalyst and its preparation method and application

A composite light and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of large differences in the position of the valence conduction band, and achieve improved photocatalytic performance and high crystallinity , the effect of mild reaction conditions

Active Publication Date: 2019-04-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bi 2 WO 6 and C 3 N 4 The position of the valence conduction band varies greatly, and Bi 2 WO 6 and C 3 N 4 Combined to make Bi 2 WO 6 / C 3 N 4 Related reports on composite photocatalysts

Method used

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  • A kind of bismuth tungstate/carbon nitride composite photocatalyst and its preparation method and application
  • A kind of bismuth tungstate/carbon nitride composite photocatalyst and its preparation method and application
  • A kind of bismuth tungstate/carbon nitride composite photocatalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0036] 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;

[0037] 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

[0040] 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 0.14mol / L, ultrasonically disperse the mixed solution in an ultrasonic instrument with a power of 500W for 20min, and then at room temperature at 350rad / L Magnetically stir for 2.5 hours at a speed of min, and finally transfer to a hydrothermal reaction kettle with a microwave power of 300W, microwave hydrothermal reaction at 190°C for 0.8 hours, and obtain a white mixed solution. The mixed solution is left to stand for stratification, and the supernatant is removed. , the precipitate was washed three times with absolute ethanol and deionized water, and dried at 70 °C for 20 h to obtain white Bi 2 WO 6 Powder;

[0041] 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 ...

Embodiment 3

[0044] 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 400rad / 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 75 °C for 18 h to obtain white Bi 2 WO 6 Powder;

[0045] Step 2: Weigh melamine and urea respectively according to the mass ratio of 1:1.2, mix them evenly and add them into deionized water to obtain a mixture, the concentration of melamine and urea in the mixture is 0...

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Abstract

The invention discloses a bismuth tungstate / carbon nitride composite photocatalyst and its preparation method and application. Bi synthesized by microwave hydrothermal 2 WO 6 Co-fired with melamine and urea to obtain C 3 N 4 As raw material, methanol as solvent, the bismuth tungstate / carbon nitride composite photocatalyst was synthesized by ultrasonic stirring method. The bismuth tungstate / carbon nitride composite powder prepared by this method has high crystallinity, and a heterojunction structure is formed between the components. The composite process is carried out at room temperature, and the reaction conditions are mild. The photocatalytic performance of the composite powder is relatively Bi 2 WO 6 and C 3 N 4 The powder has been significantly improved and has broad application prospects in photocatalytic degradation of organic pollutants.

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 Composite photocatalyst and its preparation method and application. Background technique [0002] Bi 2 WO 6 is a perovskite structure [WO 4 ] 2- layer and [Bi 2 o 2 ] 2+ The Aurivillius compound formed by staggered superposition, its conduction band (CB) is composed of W5d orbital, valence band (VB) is composed of O2p and Bi6s hybrid orbital, when the semiconductor is illuminated, electrons jump from O2p+Bi6s hybrid orbital to W5d orbital , leaving a hole on W5d. [0003] Bi 2 WO 6 The band gap is 2.8eV, and it has obvious photoresponse in the visible region (λ>400nm), but because of its narrow band gap, the photogenerated electron-hole recombination rate is high. 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 lamellar structure with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/34C02F1/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J27/24B01J37/343C02F2101/38C02F2101/36C02F2101/34C02F2305/10B01J35/39
Inventor 谈国强苏宇宁许驰赵程程夏傲
Owner SHAANXI UNIV OF SCI & TECH
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