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Composite visible light photocatalyst loaded with two promoters at the same time and application thereof

A technology of co-catalyst and photocatalyst, which is applied in the field of catalyst preparation and the sustainable development of environment and energy, can solve the problems of limited large-scale application and high precious metals, and achieves low production cost, good stability, and is conducive to sustainable development. effect of development

Inactive Publication Date: 2016-01-20
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the research on dual-cocatalyst systems is now focused on noble metals such as Pt, Au, Ru and their oxides. The high price of noble metals greatly limits their large-scale applications.

Method used

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  • Composite visible light photocatalyst loaded with two promoters at the same time and application thereof
  • Composite visible light photocatalyst loaded with two promoters at the same time and application thereof
  • Composite visible light photocatalyst loaded with two promoters at the same time and application thereof

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preparation example Construction

[0025] A composite visible light photocatalyst supporting dual co-catalysts at the same time, and its preparation method comprises the following steps:

[0026] 1) Prepare a mixed solution of water and ethanol at a volume ratio of 4:1, ultrasonically disperse the CdS nanowires in the resulting mixed solution, and bubbling with nitrogen for 0.5 hours;

[0027] 2) Under the protection of nitrogen, add the ammonium tetrathiomolybdate solution to the dispersion obtained in step 1), and then irradiate it under visible light for 0.5 hours, filter, wash, and dry to obtain CdS / MoS 2 Composite material, MoS 2 The loading capacity is 2% of the weight of CdS;

[0028] 3) The CdS / MoS obtained in step 2) 2 The composite material was ultrasonically dispersed in a phosphate buffer (concentration 0.01M) with a pH of 7.0, and then cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), irradiate with visible light for 10 minutes, filter, wash, and dry to obtain CdS / MoS 2 / Co-Pi composite visible light photocatalyst, in...

Embodiment 1

[0031] Add 50mgCdSNWs, 24mLH 2 O, 8mLC 2 H 5 OH was mixed and stirred uniformly, after 0.5 hours of nitrogen, 1mL, 1.61mg / mL (NH 4 ) 2 MoS 4 The aqueous solution is irradiated with visible light with a wavelength greater than 420nm for 0.5 hours while keeping nitrogen flowing, then the solution is centrifuged, washed three times with ethanol, and then dried under nitrogen at room temperature to obtain CdS / MoS 2 Composite materials, where MoS 2 The load is 2%; take 50mg of CdS / MoS 2 The composite material was dispersed in 25mL, pH=7 phosphate buffer solution (concentration 0.01M), and 0.5mL, 18.26mM Co(NO 3 ) 2 ·6H 2 O solution, placed in visible light (wavelength> 420nm) light for 10min, then centrifuge the solution, wash three times with ethanol, then place it in room temperature and dry it with nitrogen to obtain a load of 2% MoS 2 , 5%Co-Pi one-dimensional core-shell structure CdS / MoS 2 / Co-Pi composite visible light photocatalyst, denoted as CM5C.

Embodiment 2

[0033] Add 50mgCdSNWs, 24mLH 2 O, 8mLC 2 H 5 OH was mixed and stirred uniformly, after 0.5 hours of nitrogen, 1mL, 1.61mg / mL (NH 4 ) 2 MoS 4 The aqueous solution is irradiated with visible light with a wavelength greater than 420nm for 0.5 hours while keeping nitrogen flowing, then the solution is centrifuged, washed three times with ethanol, and then dried under nitrogen at room temperature to obtain CdS / MoS 2 Composite materials, where MoS 2 The loading capacity is 2%; take 50mg CdS / MoS 2 The composite material was dispersed in 25mL, pH=7 phosphate buffer solution (concentration 0.01M), and 1mL, 18.26mM Co(NO 3 ) 2 ·6H 2 O solution, placed in visible light (wavelength> 420nm) light for 10min, then centrifuge the solution, wash three times with ethanol, then place it in room temperature and dry it with nitrogen to obtain a load of 2% MoS 2 , 10% Co-Pi one-dimensional core-shell structure CdS / MoS 2 / Co-Pi composite visible light photocatalyst, denoted as CM10C.

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Abstract

The invention discloses a composite visible light photocatalyst loaded with two promoters at the same time and the application thereof. The two-step photodeposition method is adopted, the base metal-based reduced form promoter MoS2 and the base metal-based oxidized form promoter Co-Pi are evenly loaded on the surface layer of a CdS nanowire at the same time, and then the CdS / MoS2 / Co-Pi composite visible light photocatalyst with a one-dimensional core-shell structure is obtained. The CdS / MoS2 / Co-Pi composite visible light photocatalyst has the advantages that the preparing method is simple, catalytic efficiency is high, catalytic performance is stable, and no precious metal is contained. When the CdS / MoS2 / Co-Pi composite visible light photocatalyst is used for catalysis and photolysis of water for hydrogen production under visible light, hydrogen production rate is 30.28 mmol / g.h, apparent quantum yield is 36.4% under the 420 nm wavelength, and sustainable development of the environment and energy is facilitated.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and sustainable development of environment and energy, and in particular relates to a composite visible light photocatalyst loaded with double promoters at the same time and its application in photolysis of water to produce hydrogen. Background technique [0002] With the excessive consumption of fossil fuels and the increasing environmental problems, it is extremely urgent to develop clean energy. Hydrogen energy has attracted wide attention due to its advantages such as high calorific value and no pollution. Photocatalytic water splitting for hydrogen production provides a feasible solution for the development of hydrogen energy. However, due to the high overpotential and the rapid recombination of photogenerated electron-hole pairs, most of the existing catalysts cannot show good activity in the absence of co-catalysts even with the use of sacrificial agents to promote the catalytic reactio...

Claims

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Application Information

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IPC IPC(8): B01J27/19C01B3/04
CPCY02E60/36
Inventor 唐紫蓉韩彬
Owner FUZHOU UNIV
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