Electrochemical preparation method of BiOBr/Bi12SiO20 composite film photocatalyst and application of BiOBr/Bi12SiO20 composite film photocatalyst

A technology of composite thin film and photocatalyst, which is applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc. It can solve the problems of high energy consumption powder catalyst and difficult separation of reaction system , to achieve controllable and easy-to-operate reaction conditions, improve the photocatalytic activity of the film, and achieve mild reaction conditions

Active Publication Date: 2019-12-31
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] The present invention provides a BiOBr / BiOBr / Bi 12 SiO 20 Electrochemical Preparation Method and Application of Composite Thin Film Photocatalyst

Method used

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  • Electrochemical preparation method of BiOBr/Bi12SiO20 composite film photocatalyst and application of BiOBr/Bi12SiO20 composite film photocatalyst
  • Electrochemical preparation method of BiOBr/Bi12SiO20 composite film photocatalyst and application of BiOBr/Bi12SiO20 composite film photocatalyst

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preparation example Construction

[0018] A BiOBr / Bi 12 SiO 20 The electrochemical preparation method of composite film photocatalyst comprises the steps:

[0019] The first step is to polish the Bi and Ti plates, wash them with absolute ethanol and distilled water, dry them for later use, and prepare them with a concentration of 5-20% NaBr and NaBr. 2 SiO 3 9H 2 A mixed solution of 90-600 mL distilled water and ethylene glycol with different volume ratios of O is used as the electrolyte, and the pH is adjusted to 8-14 with nitric acid or sodium hydroxide solution to obtain the electrolyte solution A required for the reaction. Among them, distilled water and B The volume ratio of diol is 3:1~5:1;

[0020] In the second step, the Bi plate and Ti plate treated in the first step are used as anode and cathode materials respectively and placed in the electrolyte solution A. The distance between the two electrodes is 3-8 cm, and the current density is 0.5-5.0 A / dm 2 , reacted at room temperature under magnetic...

Embodiment 1

[0023] 1) After polishing the Bi and Ti plates, wash them with absolute ethanol and distilled water, and dry them for later use. Mix 12 mmoL NaBr and 6 mmoL Na 2 SiO 3 9H 2O was dissolved in 120 mL of water / EG (volume ratio 5:1) mixed solution, and the nitric acid solution adjusted the pH to 8 to obtain the electrolyte solution A required for the reaction;

[0024] 2) The Bi plate and Ti plate treated in step 1) were used as anode and cathode materials respectively in solution A, the distance between the two electrodes was 8 cm, and the current density was 1.5 A / dm 2 React with magnetic stirring at room temperature for 3 h, the surface of the Bi plate forms a thin film, rinse with absolute ethanol and distilled water three times, and then dry in an oven at 60 °C to prepare BiOBr and Bi 12 SiO 20 Immobilized BiOBr / Bi with Bilayer Structure and Photocatalytic Activity 12 SiO 20 Composite film;

[0025] 3) The prepared BiOBr / Bi 12 SiO 20 Composite thin films for photoredu...

Embodiment 2

[0027] 1) After polishing the Bi and Ti plates, wash them with absolute ethanol and distilled water, and dry them for later use. Mix 36 mmoL NaBr and 18 mmoL Na 2 SiO 3 9H 2 O was dissolved in 360 mL water / EG (3:1 volume ratio) mixed solution, and the sodium hydroxide solution adjusted the pH to 14 to obtain the electrolyte solution A required for the reaction;

[0028] 2) The Bi plate and Ti plate treated in step 1) were used as anode and cathode materials respectively in solution A, the distance between the two electrodes was 4 cm, and the current density was 3 A / dm 2 React with magnetic stirring at room temperature for 3 h, the surface of the Bi plate forms a thin film, rinse with absolute ethanol and distilled water three times, and then dry in an oven at 60 °C to prepare BiOBr and Bi 12 SiO 20 Immobilized BiOBr / Bi with Bilayer Structure and Photocatalytic Activity 12 SiO 20 Composite film;

[0029] 3) The prepared BiOBr / Bi 12 SiO 20 Composite thin films for photor...

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Abstract

The invention discloses an electrochemical preparation method of a BiOBr/Bi12SiO20 composite film photocatalyst and application of the BiOBr/Bi12SiO20 composite film photocatalyst, belonging to the fields of in-situ preparation of Bi-based composite materials, solar photocatalyst immobilization technology and artificial photosynthesis. The problems that existing synthesis methods are high in energy consumption and have difficulty in separation of powder catalysts from reaction systems can be solved. According to the invention, a BiOBr/Bi12SiO20 immobilized composite film is through one-step electrochemical synthesis at room temperature with a Bi plate, NaBr and Na2SiO3.9H2O as raw materials, water/EG as a solvent, nitric acid or a sodium hydroxide solution as an agent for adjusting a pH value and a Ti plate as a negative pole. The preparation method has the advantages of usage of cheap and easily available raw materials, no need for high temperature and high pressure, mild and controllable reaction conditions, easy operation, environment-friendly process, and no generation of harmful byproducts.

Description

technical field [0001] The invention belongs to the fields of in-situ preparation of Bi-based composite materials, solar photocatalyst immobilization technology and artificial photosynthesis, and specifically relates to a BiOBr / Bi 12 SiO 20 Electrochemical preparation method and application of composite thin film photocatalyst. Background technique [0002] catalytic reduction of CO 2 It is one of the important means to solve the greenhouse effect and energy problems. How to efficiently use renewable energy solar energy to achieve CO 2 Green conversion of resources into high value-added hydrocarbon fuels (such as CO, CH 4 or CH 3 OH, etc.) has become one of the hotspots of researchers. Bi-based photocatalysts are favored by researchers because of their cheap and easy-to-obtain raw materials and excellent photocatalytic performance. Among them, BiOBr has narrow bandgap characteristics (about 2.8 eV), which is determined by [Bi 2 o 2 ] layer and double-layer free Br-Br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J37/34C01B32/40
CPCB01J27/06B01J23/002B01J35/004B01J37/348C01B32/40
Inventor 张小超薛婷婷任广敏张长明李瑞王韵芳樊彩梅
Owner TAIYUAN UNIV OF TECH
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