Method for preparing zinc phosphide/cobalt phosphide heterojunction photocatalyst based on MOFs template

A technology of photocatalyst and zinc phosphide, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of difficult to improve photocatalytic performance, single composition, low light absorption utilization rate, etc. Achieve excellent photo-splitting water hydrogen production performance, easy to implement, and simple preparation method

Inactive Publication Date: 2017-01-11
BEIJING UNIV OF TECH
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Problems solved by technology

The main reason is that the MOFs derivative catalysts reported by previous researchers have a single structure and composition, and many derivative catalysts have low light absorption utilization rate during the photocatalytic reaction process, and it is difficult to improve the photocatalytic performance.
In addition, there are still few reports on heterojunction photocatalysts constructed by MOFs. Therefore, how to obtain MOFs derivative photocatalysts with strong electron-hole separation ability, wide light absorption range, good stability and practical application potential is still a challenge. many challenges

Method used

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  • Method for preparing zinc phosphide/cobalt phosphide heterojunction photocatalyst based on MOFs template
  • Method for preparing zinc phosphide/cobalt phosphide heterojunction photocatalyst based on MOFs template
  • Method for preparing zinc phosphide/cobalt phosphide heterojunction photocatalyst based on MOFs template

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Experimental program
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Embodiment 1

[0019] Step 1: Dissolve 0.656g of 2-methylimidazole, 0.249g of cobalt nitrate hexahydrate and 0.257g of zinc nitrate hexahydrate in 50mL of methanol under stirring at room temperature, let stand at room temperature for 24 hours, wash the mixture with methanol after centrifugation , activation, and vacuum drying at 60°C for 8 hours to obtain ZIF-ZnCo.

[0020] Step 2: Weigh 100 mg of ZIF-ZnCo prepared in Step 1, place it in a mortar and grind it for 5 minutes, and under air conditions, heat up to 300°C at a heating rate of 2°C / min and roast for 3h to obtain ZnO / Co 3 o 4 .

[0021] Step 3: Weigh 25 mg of ZnO / Co prepared in Step 2 3 o 4 , 0.6603gNaH 2 PO 2 ·H 2 O was placed in a mortar and ground for 10 min. Under the condition of nitrogen protection, the temperature was raised to 250 °C for 2 h at a rate of 2 °C / min. After the temperature dropped to room temperature, the obtained product was washed with deionized water and absolute ethanol, and heated at 60 °C. Dry under ...

Embodiment 2

[0023] Step 1: Dissolve 0.656g of 2-methylimidazole, 0.249g of cobalt nitrate hexahydrate and 0.257g of zinc nitrate hexahydrate in 50mL of methanol under stirring at room temperature, let stand at room temperature for 24 hours, wash the mixture with methanol after centrifugation , activation, and vacuum drying at 60°C for 8 hours to obtain ZIF-ZnCo;

[0024] Step 2: Weigh 100 mg of the ZIF-ZnCo prepared in step 1, place it in a mortar and grind it for 5 minutes, and under air conditions, heat up to 400°C at a heating rate of 2°C / min and roast for 2h to obtain ZnO / Co 3 o 4 ;

[0025] Step 3: Weigh 25 mg of ZnO / Co prepared in Step 2 3 o 4 , 0.7000gNaH 2 PO 2 ·H 2 O was placed in a mortar and ground for 10 min. Under the condition of nitrogen protection, the temperature was raised to 300 ° C at a rate of 2 ° C / min for phosphating for 1 h. After the temperature dropped to room temperature, the obtained product was washed with deionized water and absolute ethanol. Dry und...

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Abstract

The invention provides a method for preparing a zinc phosphide / cobalt phosphide heterojunction photocatalyst based on an MOFs template and belongs to the technical field of preparation of photocatalytic materials. ZIF-ZnCo is used as a template, and the zinc phosphide / cobalt phosphide heterojunction photocatalyst with a porous structure is formed by conducting oxidation and phosphating treatment on the template. The original framework structure characteristics of a precursor MOFs are kept based on the catalyst, active catalysis sites are fully exposed, meanwhile the catalyst promotes separation of photoproduced electron holes and improves an photo-response behavior through a good synergistic effect, and therefore shows excellent water photolysis hydrogen-production performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic materials, and the technology relates to the preparation method of metal-organic frameworks (Metal-organic frameworks, MOFs) and derivatives thereof, especially the construction of phosphide heterojunction photocatalyst materials based on bimetallic MOFs. Background technique [0002] At present, with the increasing consumption of non-renewable resources such as coal, oil, and natural gas, and various environmental pollution problems caused by energy consumption, the development of new clean energy has become a hot spot that people generally pay attention to. In the field of developing clean new energy technologies, it is considered to be one of the effective ways to solve the problems of energy crisis and environmental pollution by utilizing the abundant solar energy on the earth and converting it into clean energy through semiconductor photocatalysis technology. Among them,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185
CPCB01J27/1853B01J35/004B01J35/026
Inventor 李建荣郭瑞梅豆义波白金泉谢亚勃
Owner BEIJING UNIV OF TECH
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