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Visible-light-induced photocatalyst loaded with vanadium tetrasulfide and preparation method

A technology of vanadium tetrasulfide and catalyst is applied in the field of photocatalysis to achieve the effect of improving quantum efficiency and promoting separation

Inactive Publication Date: 2014-10-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, about 1.8eV is required to completely decompose water, and VS 4 It has strong reducibility, and the holes formed in the photocatalytic reaction may oxidize it and deactivate it, so it needs to be further modified to apply it to photocatalytic water splitting

Method used

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  • Visible-light-induced photocatalyst loaded with vanadium tetrasulfide and preparation method
  • Visible-light-induced photocatalyst loaded with vanadium tetrasulfide and preparation method
  • Visible-light-induced photocatalyst loaded with vanadium tetrasulfide and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Visible light catalytic degradation of waste water containing formaldehyde

[0016] Prepare the catalyst as follows:

[0017] 1) Weigh 0.1343g of carbon nanotubes (CNTs), disperse them in 90mL of deionized water, and sonicate for 0.5h to form a homogeneous solution, ready for use;

[0018] 2) Weigh 2.7g sodium orthovanadate dodecahydrate and 7.5g thioacetamide (CH 3 CSNH 2 ), dissolved in the solution obtained in 1), and continuously stirred for 0.5h; transferred to a 150mL high-temperature hydrothermal reaction kettle, kept at 150°C for 12h, and cooled naturally to room temperature.

[0019] 3) The obtained product was centrifuged, washed with water and ethanol for 3 to 5 times, dried in vacuum at 60° C. for 6 hours, and ground to obtain VS containing 5% carbon nanotubes. 4 catalyst.

[0020] Prepare 500mL simulated industrial wastewater containing 1% formaldehyde solution, add 0.5g of the above catalyst, simulate sunlight with a 500W high-pressure xenon...

Embodiment 2

[0023] Example 2: Visible light catalytic decomposition of water to produce hydrogen

[0024] Prepare the catalyst as follows:

[0025] 1) Weigh 0.0537g graphene oxide (GO), disperse it in 60mL deionized water, and ultrasonicate for 1h to form a homogeneous solution, ready for use;

[0026] 2) Weigh 1.8g Na 3 VO 4 12H 2 O and 1.65g CH 3 CSNH 2 , dissolved in the solution obtained in 1), and kept stirring for 1 hour; transferred to a 100mL high-temperature hydrothermal reaction kettle, kept at 160°C for 24 hours, and cooled naturally to room temperature.

[0027] 3) The obtained product was centrifuged, washed with water and ethanol for 3 to 5 times, dried in vacuum at 60°C for 6 hours, and ground to obtain VS containing 3% graphene. 4 catalyst.

[0028] Configuration with NaS 2 Concentration 0.35mol / L, Na 2 SO 3 Add 0.5g catalyst to 500mL of 0.25mol / L solution, avoid light and sonicate for 0.5h, simulate sunlight with 500W high-pressure xenon lamp (filter wavelength ...

Embodiment 3

[0029] Example 3: Visible light catalytic decomposition of biomass ethanol to produce hydrogen

[0030] Prepare the catalyst as follows:

[0031] 1) Weigh 0.0537g of ground silver sulfide powder, disperse it in 60mL of deionized water, and ultrasonicate for 0.5h to form a homogeneous solution, ready for use;

[0032] 2) Weigh 1.8g Na 3 VO 4 12H 2 O and 1.65g CH 3 CSNH 2 , dissolved in the solution obtained in 1), and continuously stirred for 1.5h; transferred to a 100mL high-temperature hydrothermal reaction kettle, kept at 160°C for 48h, and cooled naturally to room temperature.

[0033] 3) The obtained product was centrifuged, washed with water and ethanol for 3 to 5 times, then vacuum-dried at 60°C for 6 hours, and ground to obtain 3% Ag 2 S VS 4 catalyst of light.

[0034] In a 500mL photocatalytic reactor, add 0.5g catalyst, 500mL biomass ethanol, add 0.1mol Na 2 Mix S well, avoid light and ultrasonically for 0.5h, use 500W high-pressure xenon lamp (filter wavele...

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Abstract

The invention discloses a visible-light-induced photocatalyst loaded with four vanadium tetrasulfide (VS4) active component and a preparation method and belongs to the technical field of photocatalytic techniques. Graphene, carbon nano tube and silver sulfide are used as template carriers to improve the photocatalytic activity. The photocatalyst takes VS4 as the active component and the carbon nano tube as a carrier, and is prepared through a solvothermal method. The result shows that the prepared composite photocatalyst has good response at the visible light area and can effectively carry out water photolysis reaction; the success of the preparation of the photocatalyst has a certain theoretical and practical significance on sewage photocatalytic decomposition and hydrogen preparation through water photodecomposition for solving energy crisis.

Description

technical field [0001] The present invention relates to the field of photocatalysis, more specifically, relate to a kind of active component is vanadium tetrasulfide (VS 4 ) preparation and application of visible light catalyst, the catalyst can be used for research and application in photocatalytic fields such as photodegradation of organic matter and photocatalytic water splitting. Background technique [0002] Since researchers discovered TiO in 1972 2 Since water can be completely decomposed into hydrogen and oxygen under ultraviolet light, the research on semiconductor photocatalytic water splitting has attracted the attention of many researchers. Hydrogen energy has many advantages such as high calorific value (≈143kJ / g), convenient storage, clean and environmentally friendly, and non-toxic. [0003] Under light conditions, electrons in the outer layer of the semiconductor material are excited and transition from the valence band to the conduction band to form electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C01B3/06C01B3/22
CPCY02E60/36Y02W10/37
Inventor 吴东方郭威威
Owner SOUTHEAST UNIV
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