A kind of p-n heterojunction bivo4/mos2 composite photocatalyst and preparation method thereof

A composite light and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve good catalytic performance and efficient degradation effects

Active Publication Date: 2019-02-05
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Benefiting from the unique structural features of the two, this patent is aimed at p-n heterojunction photocatalyst BiVO 4 /MoS 2 conducted research, the butterfly-shaped BiVO 4 In flowe

Method used

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  • A kind of p-n heterojunction bivo4/mos2 composite photocatalyst and preparation method thereof
  • A kind of p-n heterojunction bivo4/mos2 composite photocatalyst and preparation method thereof
  • A kind of p-n heterojunction bivo4/mos2 composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0021] Example 1

[0022] (1) Add 0.7g NH 4 VO 3 And 2.9g Bi(NO 3 ) 3 Add it to 50mL of nitric acid solution with a molar concentration of 2.0mol / L, and then sonicate for 30min;

[0023] (2) Adjust the pH value of the solution obtained in step (1) to 2 with ammonia water to form a yellow precipitate, and then age it for 2 hours;

[0024] (3) Transfer the suspension obtained in step (2) to a high-pressure hydrothermal reactor with a polytetrafluoroethylene liner for hydrothermal reaction at 200°C for 24 hours, then cool to room temperature and filter, and wash with water and ethanol three times each , Placed in a constant temperature drying oven at 80 ℃ for 12 hours to obtain butterfly-shaped BiVO 4 Photocatalyst, marked as BV.

[0025] BiVO prepared in this embodiment 4 The photocatalyst degrades 10mg / L of rhodamine B dye wastewater under light, and the degradation rate is 79.0% in 5 hours.

Example Embodiment

[0026] Example 2

[0027] (1) Add 0.7g NH 4 VO 3 And 2.9g Bi(NO 3 ) 3 Add it to 50mL of nitric acid solution with a molar concentration of 2.0mol / L, and then sonicate for 30min;

[0028] (2) Adjust the pH value of the solution obtained in step (1) to 2 with ammonia water to form a yellow precipitate, and then age it for 2 hours;

[0029] (3) Transfer the suspension obtained in step (2) to a high-pressure hydrothermal reactor with a polytetrafluoroethylene liner for hydrothermal reaction at 200°C for 24 hours, then cool to room temperature and filter, and wash with water and ethanol three times each , Placed in a constant temperature drying oven at 80 ℃ for 12 hours to obtain butterfly-shaped BiVO 4 catalyst of light;

[0030] (4) Add 0.019g (NH 4 ) 6 MoO 7 O 24 ·4H 2 O and 0.15g thiourea were added to the water and stirred for 30min to obtain a dark green solution;

[0031] (5) Add 0.12 g of BiVO prepared in step (3) to the dark green solution obtained in step (4) 4 The photocatalyst i...

Example Embodiment

[0033] Example 3

[0034] (1) Add 0.7g NH 4 VO 3 And 2.9g Bi(NO 3 ) 3 Add it to 50mL of nitric acid solution with a molar concentration of 2.0mol / L, and then sonicate for 30min;

[0035] (2) Adjust the pH value of the solution obtained in step (1) to 2 with ammonia water to form a yellow precipitate, and then age it for 2 hours;

[0036] (3) Transfer the suspension obtained in step (2) to a high-pressure hydrothermal reactor with a polytetrafluoroethylene liner for hydrothermal reaction at 200°C for 24 hours, then cool to room temperature and filter, and wash with water and ethanol three times each , Placed in a constant temperature drying oven at 80 ℃ for 12 hours to obtain butterfly-shaped BiVO 4 catalyst of light;

[0037] (4) Add 0.047g (NH 4 ) 6 MoO 7 O 24 ·4H 2 O and 0.37g thiourea were added to water and stirred for 30min to obtain a dark green solution;

[0038] (5) Add 0.12 g of BiVO prepared in step (3) to the dark green solution obtained in step (4) 4 The photocatalyst is th...

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Abstract

The invention discloses a preparation method of a p-n heterojunction BiVO4/MoS2 composite photocatalyst. The specific steps are: (1) adding NH4VO3 and Bi(NO3)3 into a nitric acid solution, then ultrasonicating, and adjusting the pH with ammonia water Form a yellow precipitate, then age it for 2 hours, transfer it to a hydrothermal reaction kettle at 200 ° C for 24 hours, centrifuge, wash three times with water, and dry it in an oven to obtain a butterfly-shaped BiVO4 photocatalyst; (2) (NH4)6MoO7O24 Add 4H2O and thiourea into water and stir to obtain a dark green solution, then add the prepared BiVO4 photocatalyst, then transfer to a hydrothermal reaction kettle at 200°C for 24 hours, and finally cool naturally, centrifuge, wash with water and ethanol three times, Dry to obtain BiVO4/MoS2 composite photocatalyst. The BiVO4/MoS2 composite photocatalyst prepared by the invention has good photocatalytic performance, can efficiently degrade high-concentration dye wastewater under the condition of light, and has potential application value in the treatment technology of degrading organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst and dye wastewater degradation, in particular to a p-n heterojunction BiVO 4 -MoS 2 Composite photocatalyst and preparation method thereof. Background technique [0002] In the past decades, photocatalysis has been applied to solve energy and environmental pollution problems, such as the conversion of solar energy and the removal of pollutants. However, many photocatalysts can only use the ultraviolet part of sunlight, and that part only accounts for 3%-5% of solar energy, while the contribution rate of visible light is as much as 43%, so the ultraviolet-visible light that responds to ultraviolet-visible light Visible photocatalysis has attracted more and more attention from scholars, and has gradually become a hot spot in the field of photocatalysis research. Nanophotocatalyst (BiVO 4 ) has visible light catalytic activity and has a good application prospect in the treatment of refracto...

Claims

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Application Information

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IPC IPC(8): B01J27/051C02F1/30
CPCY02W10/37
Inventor 孙剑辉王竞侦董淑英孙靖宇骆圣达谭露王玉园
Owner HENAN NORMAL UNIV
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