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Composite photocatalyst and preparation method thereof

A composite catalyst and catalyst technology, applied in the field of photocatalysis, can solve the problems of low activity and expensive precious metal cocatalysts, and achieve the effects of easy availability of raw materials, simple preparation method, and improvement of photocatalytic hydrogen production activity.

Active Publication Date: 2019-05-03
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low activity, it is usually necessary to support noble metal cocatalysts. For example, the Chinese invention patent application number is CN201310030567, and the name is Pt / CdS composite visible light catalyst and its preparation method. Impregnated on CdS, shows good photocatalytic hydrogen production activity, but noble metal co-catalysts are usually expensive
In order to reduce the cost, non-noble metal cocatalysts have become a current research hotspot. Catalysts based on transition metal Ni have been widely used in the research of catalytic hydrogen production. However, due to the high hydrogen production overpotential on the surface of Ni, Ni When used as a cocatalyst, the photocatalytic hydrogen production activity of CdS is still lower than that of the noble metal Pt, so it is necessary to find a way to reduce the hydrogen production overpotential of Ni.
However, there are few reports on the application of Ni@NiOx as CdS promoter in photocatalytic hydrogen production.

Method used

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  • Composite photocatalyst and preparation method thereof
  • Composite photocatalyst and preparation method thereof
  • Composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] This embodiment provides a Ni@NiOx / CdS composite photocatalyst, the preparation method is as follows:

[0019] (1) Dissolve 4.66 g of cadmium nitrate tetrahydrate and 3.45 g of thiourea in 72 mL of ethylenediamine solution at room temperature, then react the resulting solution at 160°C for 48 h to obtain a precipitate, which is washed and dried That is, the CdS nanowires with ethylenediamine adsorbed on the surface were obtained.

[0020] (2) The above-mentioned obtained CdS nanowires and nickel acetylacetonate are dissolved in N,N-dimethylformamide solution, wherein the CdS nanowires, nickel acetylacetonate and N,N-dimethylformamide The mass ratio was 1:1:566.7; then the resulting solution was reacted at 200°C for 10 h; washed and dried under vacuum to obtain a Ni / CdS composite photocatalyst.

[0021] (3) The obtained Ni / CdS composite photocatalyst was calcined at 250 °C for 1 h to obtain Ni@NiOx / CdS composite photocatalyst with Ni@NiOx as CdS cocatalyst.

[0022] f...

Embodiment approach 2

[0024] This embodiment provides a Ni@NiOx / CdS composite photocatalyst, the preparation method is as follows:

[0025] (1) The preparation method of CdS nanowires is exactly the same as Embodiment 1.

[0026] (2) Dissolve the above-mentioned CdS nanowires and nickel acetylacetonate in N,N-dimethylformamide solution, wherein the CdS nanowires, nickel acetylacetonate and N,N-dimethylformamide The mass ratio was 0.9:1.1:566.7; then the resulting solution was reacted at 190 °C for 8 h; washed and dried under vacuum to obtain a Ni / CdS composite photocatalyst.

[0027] (3) The obtained Ni / CdS composite catalyst was calcined at 200 °C for 0.5 h to obtain Ni@NiOx / CdS composite photocatalyst with Ni@NiOx as CdS cocatalyst.

Embodiment approach 3

[0029] This embodiment provides a Ni@NiOx / CdS composite photocatalyst, the preparation method is as follows:

[0030] (1) The preparation method of CdS nanowires is exactly the same as Embodiment 1.

[0031] (2) The above-mentioned obtained CdS nanowires and nickel acetylacetonate are dissolved in N,N-dimethylformamide solution, wherein the CdS nanowires, nickel acetylacetonate and N,N-dimethylformamide The mass ratio was 1.1:0.9:566.7; then the resulting solution was reacted at 210 °C for 12 h; washed and dried under vacuum to obtain a Ni / CdS composite photocatalyst.

[0032] (3) The obtained Ni / CdS composite photocatalyst was calcined at 280 °C for 4 h to obtain Ni@NiOx / CdS composite photocatalyst with Ni@NiOx as CdS cocatalyst.

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Abstract

The invention relates to the field of photocatalysis. The invention discloses a composite photocatalyst and a preparation method thereof. The composite catalyst is a composite photocatalyst with Ni@NiOx as a CdS promoter. The preparation method comprises the following steps: synthesizing CdS nanowires with amino groups adsorbed on the surface; preparation of Ni / CdS composite photocatalyst; preparation of Ni@NiOx / CdS composite photocatalyst: Ni@NiOx / CdS composite photocatalyst is obtained by calcining Ni / CdS composite photocatalyst at low temperature. The invention reduces the hydrogen production overpotential of Ni and improves the photocatalytic hydrogen production activity by supporting Ni on the surface of CdS through simple solvothermal reduction and forming NiOx on the surface of Ni instead of the surface of CdS by a low-temperature calcination method. The raw materials used are easy to obtain and the preparation method is simple. The material prepared by the invention is appliedto photocatalytic hydrogen production, and the photocatalytic hydrogen production efficiency of the composite sample is 104 times as high as that of pure CdS.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a composite photocatalyst with Ni@NiOx as a CdS cocatalyst and a preparation method thereof. Background technique [0002] CdS has become a popular material for hydrogen production due to its suitable band gap, visible light, and suitable conduction band position. Due to the low activity, it is usually necessary to support noble metal cocatalysts. For example, the Chinese invention patent application number is CN201310030567, and the name is Pt / CdS composite visible light catalyst and its preparation method. Impregnated on CdS, it shows good photocatalytic hydrogen production activity, but noble metal co-catalysts are usually expensive. In order to reduce the cost, non-noble metal cocatalysts have become a current research hotspot. Catalysts based on transition metal Ni have been widely used in the research of catalytic hydrogen production. However, due to the high hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C01B3/02
Inventor 张立静杨烨张玉婷徐孙悦闾荣荣胡涛陈静王朝宇李义
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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