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a bi/bi 2 sio 5 Preparation method and application of photocatalyst

A photocatalyst, 3·5H2O technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the impact of sample stability, high cost of precious metals, reaction The problem of complex process, etc., to achieve the effect of simple and easy-to-control preparation method, excellent ability and excellent performance

Active Publication Date: 2022-08-05
TAIYUAN UNIV OF TECH
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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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  • a bi/bi <sub>2</sub> sio <sub>5</sub> Preparation method and application of photocatalyst
  • a bi/bi <sub>2</sub> sio <sub>5</sub> Preparation method and application of photocatalyst
  • a bi/bi <sub>2</sub> sio <sub>5</sub> Preparation method and application of photocatalyst

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preparation example Construction

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

[0023] The first step is to weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 SiO 3 ·9H 2 O, dissolve in equal volumes of ethylene glycol and deionized water, respectively, and stir for 0.5 to 2 h to form solutions A and B, respectively, take equal volumes of solutions A and B, mix and stir for 1 to 3 h to form a white suspension C ;

[0024]In the second step, dropwise into suspension C with a concentration of 1 mol / L NaOH solution to adjust the pH of the solution to 9 to 14, transfer the reaction solution to a 100 to 500 mL reactor, and react at 150 to 200 ° C for 6 to 12 h, take out the reactor and cool it to room temperature, carry out centrifugation, wash the precipitate with deionized water and absolute ethanol for 3 times respectively, then collect the precipitate and put it in an oven at 80 °C to dry for 12 h to obtain Bi / Bi 2 SiO 5 catalyst of light.

[0025] The pharmaceutic...

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 (molar ratio of 2:1) was dissolved in 50 mL of ethylene glycol and 50 mL of deionized water, respectively, and stirred for 1 h to form solutions A and B. Take equal volumes of 20 mL of solution A and 20 mL of solution B, mix and stir for 2 h. A white suspension C was formed;

[0028] 2) Add 1 mol / L NaOH solution dropwise into suspension C to adjust the pH of the solution to 11, transfer the reaction solution to a 100 mL reaction kettle, react at 150 °C for 6 h, take out the reaction kettle and cool it to room temperature for After centrifugation, the precipitate was washed three times with deionized water and anhydrous 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 Photocatalysts for photoreduction of CO 2 Performance test, the selectivity of its gas phase product CO is 100%, p...

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 (molar ratio of 3:1) was dissolved in 100 mL of ethylene glycol and 100 mL of deionized water, respectively, and 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 a white Suspension C;

[0032] 2) Add 1 mol / L NaOH solution dropwise into suspension C to adjust the pH of the solution to 12, transfer the reaction solution to a 200 mL reaction kettle, react at 180 °C for 8 h, take out the reaction kettle and cool it to room temperature, and carry out After centrifugation, the precipitate was washed three times with deionized water and anhydrous 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 Photocatalysts for photoreduction of CO 2 Performance test, the selectivity of its gas phase product CO is 100%, photo...

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Abstract

A Bi / Bi 2 SiO 5 The preparation method and application of a photocatalyst belong to the controllable preparation of Bi / Bi-based photocatalytic material composite system, CO 2 Reduction of resources conversion and utilization, artificial photosynthesis field, can solve Bi 2 SiO 5 Due to the narrow photoresponse range and high photogenerated electron-hole recombination rate, Bi(NO 3 ) 3 ·5H 2 O and Na 2 SiO 3 ·9H 2 O is a bismuth source and a silicon source, ethylene glycol and deionized water are the solvents, and the NaOH solution is the pH value adjuster. Using a one-step hydrothermal method, the pH value of the reaction solution is adjusted between 9 and 14 by adjusting the concentration of the NaOH solution. High purity Bi / Bi 2 SiO 5 Photocatalysts that ultimately increase Bi 2 SiO 5 Photocatalytic reduction of CO 2 The activity, selectivity and stability provide new methods and new applications for the preparation of high-efficiency novel elemental Bi / Bi-based photocatalytic material composite systems.

Description

technical field [0001] The invention belongs to the controllable preparation of Bi / Bi-based photocatalytic material composite system, CO 2 The field of reduction resources conversion and utilization, artificial photosynthesis, specifically relates to a Bi / Bi 2 SiO 5 Preparation method of photocatalyst and application thereof. Background technique [0002] Since the 21st century, despite urgent calls from the United Nations and global climate experts to control CO 2 emissions, but global CO 2 Emissions remained at record highs in 2018, with global fossil fuel use 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 have received 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 of the hotspots ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18C01B32/40
CPCB01J23/18B01J23/002B01J35/004C01B32/40
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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