Heterojunction composite visible-light-induced photocatalyst and preparation method thereof

A catalyst and visible light technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of unsatisfactory photocatalytic performance, achieve high photoelectric and catalytic performance, large specific surface area, chemical The effect of strong stability

Pending Publication Date: 2020-05-29
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in fact a single Bi 2 WO 6 The photocatalytic performance is still not ideal

Method used

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  • Heterojunction composite visible-light-induced photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] A heterojunction composite visible light catalyst, adopting a one-step hydrothermal method, configuring bismuth nitrate aqueous solution in acidic deionized water; then slowly adding sodium tungstate solution dropwise to the bismuth nitrate solution under magnetic stirring and stirring until the solution becomes clear; Add CTAB for ultrasonic dispersion; and obtain a composite photocatalyst through one-step hydrothermal treatment, which is prepared according to the following steps:

[0022] (1) Add citric acid to 50ml deionized water, adjust the pH value to 3 to obtain acidic deionized water; add 1mmol bismuth oxycarbonate to the acidic deionized water to prepare a bismuth salt solution; then add 1mmol sodium tungstate after initial stirring, Stir rapidly while adding to form a uniform suspension; then adjust the total volume of the suspension to 70ml, stir until the solution becomes clear; add 0.1mmol cetyltrimethylammonium bromide (CTAB) for ultrasonic dispersion for 3...

Embodiment 2

[0027] A heterojunction composite visible light catalyst, similar to Example 1, is prepared according to the following steps:

[0028] (1) Add salicylic acid to 50ml deionized water, adjust the pH value to 5 to obtain acidic deionized water; add 1.5mmol bismuth nitrate pentahydrate in acidic deionized water to prepare bismuth salt solution; then add 1mmol sodium tungstate after initial stirring , stir rapidly while adding to form a uniform suspension, then adjust the total volume of the suspension to 70ml, stir until the solution becomes clear; add 0.3mmol CTAB for ultrasonic dispersion for 30min;

[0029] (2) Put the suspension obtained in step (1) into a stainless steel autoclave lined with polytetrafluoroethylene with a volume of 100 ml, and perform hydrothermal treatment at a temperature of 473K for 12 hours;

[0030] (3) After stopping the reaction, the precipitated product was washed with deionized water and dried to obtain flower-like Bi 6 o 6 (OH) 3 (NO 3 ) 3 -Bi ...

Embodiment 3

[0033] A heterojunction composite visible light catalyst, similar to Example 1, is prepared according to the following steps:

[0034] (1) Add salicylic acid to 50ml of deionized water, adjust the pH value to 4 to obtain acidic deionized water; add 2mmol of bismuth nitrate pentahydrate to the acidic deionized water; add 1mmol of sodium tungstate after preliminary stirring, and stir rapidly while adding , form a uniform suspension, then adjust the total volume of the suspension to 70ml, stir until the solution becomes clear; add 0.4mmol CTAB for ultrasonic dispersion for 30min;

[0035] (2) Put the suspension obtained in step (1) into a stainless steel autoclave lined with polytetrafluoroethylene with a volume of 100 ml, and perform hydrothermal treatment at a temperature of 413K for 18 hours;

[0036] (3) After stopping the reaction, the precipitated product was washed with deionized water and dried to obtain flower-like Bi 6 o 6 (OH) 3 (NO3 ) 3 -Bi 2 WO 6 Composite hete...

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Abstract

The invention relates to a heterojunction composite visible-light-induced photocatalyst and a preparation method thereof. The molecular formula of the heterojunction composite visible-light-induced photocatalyst is Bi6O6(OH)3(NO3)3-Bi2WO6, and the morphology of the heterojunction composite visible-light-induced photocatalyst is a 3D flower-like superstructure composed of lamellas. The method comprises the steps of: preparing a bismuth nitrate aqueous solution with a certain concentration in acidic deionized water; slowly dropwise adding the sodium tungstate solution into the bismuth nitrate solution under magnetic stirring, and performing stirring until the solution becomes clear; adding CTAB for ultrasonic dispersion; and carrying out one-step hydrothermal treatment to obtain the composite photocatalyst. The preparation method provided by the invention is free of environmental pollution, simple and convenient in process and flow, wide in parameter adjustable range, high in repeatability and low in production cost, and can be used for large-batch industrial production. The prepared composite photocatalyst has the characteristics of high quantum efficiency, large specific surface area and high catalytic efficiency.

Description

technical field [0001] The invention relates to a heterojunction composite visible light catalyst and a preparation method thereof, belonging to the field of nanometer preparation. Background technique [0002] Photocatalytic technology is an environmental control technology that utilizes sunlight, has no secondary pollution, and can completely decompose organic pollutants. Its development for more than 30 years has attracted more and more attention from scientific researchers, but in general, photocatalytic technology is still in the stage of theoretical research and experimental exploration. Among them, insufficient utilization of visible light and low quantum efficiency of catalysts have become the main factors restricting the development of photocatalytic technology. Therefore, expanding the photoresponse range of photocatalysts and improving the quantum efficiency of photocatalysts has become a top priority for the development of photocatalytic technology. [0003] Bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/25B01J35/10B01J37/10B01J37/34
CPCB01J27/25B01J35/004B01J35/0033B01J35/10B01J35/023B01J37/10B01J37/343
Inventor 崔大祥林琳吴晓燕邬淑红金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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