Bismuth tungstate/bismuth phosphate heterojunction photocatalyst and preparation method and application thereof

A photocatalyst, bismuth phosphate technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sewage treatment, etc., to achieve high crystallinity, improved photocatalytic performance, and good photocatalytic performance

Active Publication Date: 2017-06-23
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 BiPO 4 Combined to make Bi 2 WO 6 / BiPO 4 Related reports on heterojunction photocatalysts

Method used

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  • Bismuth tungstate/bismuth phosphate heterojunction photocatalyst and preparation method and application thereof
  • Bismuth tungstate/bismuth phosphate heterojunction photocatalyst and preparation method and application thereof
  • Bismuth tungstate/bismuth phosphate heterojunction photocatalyst and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 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;

[0034] Step 2: Add 3mmol Na 3 PO 4 , 3mmol Bi(NO 3 ) 3 and 5mL of 1mol / L nitric acid solution were dissolved in deionized water, and after stirring, a white mixed solution was obtained. The concentration of Bi element in the mixed soluti...

Embodiment 2

[0037] 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 stirred for 1.5 hours at a speed of min, and finally transferred to a hydrothermal reaction kettle with a microwave power of 300W. Microwave hydrothermal reaction was carried out at 190°C for 0.8 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 18 h to obtain white Bi 2 WO 6 Powder;

[0038] Step 2: Add 3mmol Na 3 PO 4 , 3mmol Bi(NO 3 ) 3 and 4mL 1mol / L nitric acid solution were dissolved in deionized water...

Embodiment 3

[0041] 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 1 hour, and finally transferred to a hydrothermal reaction kettle with a microwave power of 300W, microwave hydrothermal reaction at 200°C for 0.5 hours, and a white mixed solution was obtained. 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;

[0042] Step 2: Add 3mmol Na 3 PO 4 , 3mmol Bi(NO 3 ) 3 and 4.5mL 1mol / L nitric acid solution were dissolved in deionized water, and a white mixed solution was obtained after stirring. The concentration of Bi element in the m...

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Abstract

The invention discloses bismuth tungstate/bismuth phosphate heterojunction photocatalyst and a preparation method and application thereof. Bi2WO6 and BiPO4 which are synthesized through a microwave hydrothermal method are utilized as raw materials, methyl alcohol is utilized as a solvent, and an ultrasonic method stirring method is utilized to synthesize the Bi2WO6/BiPO4 heterojunction photocatalyst. A composition powder body prepared through the method has high crystallization, heterogeneous structures are formed between ingredients, a compounding process is performed under room temperature, reaction conditions are moderate, and photocatalytic performance can be obviously improved compared with Bi2WO6 and BiPO4 photocatalysts. In simulated sunlight illumination, the degradation rate of the heterojunction photocatalyst is 1.02 times that of Bi2WO6 and 59 times that of BiPO4; thus, the heterojunction photocatalyst has a wide application prospect in an aspect of 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 / BiPO 4 Heterojunction photocatalyst and its preparation method and application. Background technique [0002] Bi 2 WO 6 The forbidden band width is about 2.8eV, 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. BWO has a narrow band gap, a weak response to ultraviolet light, and a high electron-hole recombination rate. [0003] BiPO 4 The bandgap width is about 4eV. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/186C02F1/30C02F1/72C02F101/30
CPCY02W10/37B01J27/186B01J35/004C02F1/30C02F1/725C02F2101/30C02F2305/10
Inventor 谈国强苏宇宁许驰赵程程夏傲
Owner SHAANXI UNIV OF SCI & TECH
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