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Preparation method and application of Bi/Bi2SiO5 photocatalyst

A photocatalyst, 3·5H2O technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the influence of sample stability, limitations, and complex reaction processes And other issues

Active Publication Date: 2019-12-20
TAIYUAN UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

However, the introduction of heterogeneous elements makes the reaction process more complicated, and the material structure, morphology, properties, etc. may change greatly, and the stability of the sample may also be greatly affected, and the cost of precious metals is high, which is greatly affected in practical applications. big limit

Method used

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  • Preparation method and application of Bi/Bi2SiO5 photocatalyst
  • Preparation method and application of Bi/Bi2SiO5 photocatalyst
  • Preparation method and application of Bi/Bi2SiO5 photocatalyst

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preparation example Construction

[0022] A Bi / Bi 2 SiO 5 The preparation method of photocatalyst comprises the steps:

[0023] In the first step, Bi(NO 3 ) 3 ·5H 2 O and Na 2 SiO 3 9H 2 O, respectively dissolved in equal volumes of ethylene glycol and deionized water, stirred for 0.5-2 hours to form solutions A and B respectively, mixed with equal volumes of solutions A and B and stirred for 1-3 hours, to form a white suspension C ;

[0024]In the second step, drip the suspension C with a concentration of 1 mol / L NaOH solution to adjust the pH of the solution to 9-14, transfer the reaction solution to a 100-500 mL reactor, and react at 150-200°C for 6-12 h, take out the reactor and cool it down to room temperature, and perform centrifugation, wash the precipitate three times with deionized water and absolute ethanol respectively, then collect the precipitate, and dry it in an oven at 80°C for 12 h to obtain Bi / Bi 2 SiO 5 catalyst of light.

[0025] The pharmaceutical reagents used in the examples...

Embodiment 1

[0027] 1) 1.940 g Bi(NO 3 ) 3 5H 2 O and 0.5684 g Na 2 SiO 3 9H 2 O (2:1 molar ratio) was dissolved in 50 mL ethylene glycol and 50 mL deionized water, respectively, and stirred for 1 h to form solutions A and B. Take equal volumes of 20 mL solution A and 20 mL solution B, mix and stir for 2 h , forming a white suspension C;

[0028] 2) Add 1 mol / L NaOH solution dropwise to the suspension C to adjust the pH of the solution to 11, transfer the reaction solution to a 100 mL reactor, react at 150°C for 6 h, take out the reactor and cool it to room temperature, After centrifugation, the precipitate was washed three times with deionized water and absolute ethanol, and then the precipitate was collected and dried in an oven at 80 °C for 12 h to obtain Bi / Bi 2 SiO 5 catalyst of light.

[0029] Bi / Bi prepared above 2 SiO 5 Photocatalyst for photoreduction of CO 2 Performance test, the selectivity of its gas phase product CO is 100%, photocatalytic reduction of CO under th...

Embodiment 2

[0031] 1) 2.910 g Bi(NO 3 ) 3 5H 2 O and 0.5684 g Na 2 SiO 3 9H 2 O (3:1 molar ratio) was dissolved in 100 mL ethylene glycol and 100 mL deionized water, stirred for 1 h to form solutions A and B, 50 mL of solution A and 50 mL of solution B were mixed and stirred for 2 h to form white suspension C;

[0032] 2) Add 1 mol / L NaOH solution dropwise to Suspension C to adjust the pH of the solution to 12, transfer the reaction solution to a 200 mL reactor, react at 180°C for 8 h, take out the reactor and cool to room temperature, After centrifugation, the precipitate was washed three times with deionized water and absolute ethanol, and then the precipitate was collected and dried in an oven at 80 °C for 12 h to obtain Bi / Bi 2 SiO 5 catalyst of light.

[0033] Bi / Bi prepared above 2 SiO 5 Photocatalyst for photoreduction of CO 2 Performance test, the selectivity of its gas phase product CO is 100%, photocatalytic reduction of CO under the irradiation of ultraviolet light...

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Abstract

The invention relates to a preparation method and application of a Bi / Bi2SiO5 photocatalyst, belongs to the fields of controllable preparation of a Bi / Bi-based photocatalytic material composite system, CO2 reduction resource conversion and utilization and artificial photosynthesis, and solves the problems of narrow light response range of Bi2SiO5, high photoelectron-hole combination rate and the like. In the preparation method, Bi(NO3)3.5H2O and Na2SiO3.9H2O are respectively taken as a bismuth source and a silicon source, ethylene glycol and deionized water are taken as solvents, a NaOH solution is taken as a pH value regulator, a one-step hydrothermal method is utilized, the pH value of a reaction solution is adjusted to be 9-14 by regulating the concentration of the NaOH solution, and the high-purity Bi / Bi2SiO5 photocatalyst can be obtained. Finally, activity, selectivity and stability of Bi2SiO5 for photocatalytic reduction of CO2 are improved, and a new method and a new applicationare provided for preparation of a high-efficiency novel elemental Bi / Bi-based photocatalytic material composite system.

Description

technical field [0001] The invention belongs to the controllable preparation of Bi / Bi-based photocatalytic material composite system, CO 2 Reduction of resource transformation and utilization, artificial photosynthesis field, specifically related to a Bi / Bi 2 SiO 5 Preparation method of photocatalyst and its application. Background technique [0002] Since the 21st century, although the United Nations and global climate experts have been urgently calling for the control of CO 2 emissions, but the global CO 2 Emissions remained at record highs in 2018, and global fossil fuel use is forecast to increase by 2.7% in 2019 compared to 2018. Visible, CO 2 Emissions are gradually increasing, and the resulting energy crisis and environmental problems are getting more and more attention. Among them, how to efficiently use renewable energy solar energy to achieve CO 2 Resource green conversion into high value-added solar fuels (such as CO, CH 4 or CH 3 OH, etc.) has become one...

Claims

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Application Information

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IPC IPC(8): B01J23/18C01B32/40
CPCB01J23/18B01J23/002C01B32/40B01J35/39
Inventor 张小超官修帅任广敏张长明李瑞王韵芳樊彩梅
Owner TAIYUAN UNIV OF TECH
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