a biobr/bi 12 sio 20 Electrochemical preparation method of composite thin film photocatalyst and its application

A technology of composite thin film and photocatalyst, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, etc. It can solve the problems of difficult reaction system separation, high energy consumption powder catalyst, etc. , to achieve the effect of improving the photocatalytic activity of the film, controlling the reaction conditions and easy operation, and overcoming the difficulty of separation

Active Publication Date: 2022-08-05
TAIYUAN UNIV OF TECH
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  • Description
  • Claims
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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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  • a biobr/bi <sub>12</sub> sio <sub>20</sub> Electrochemical preparation method of composite thin film photocatalyst and its application
  • a biobr/bi <sub>12</sub> sio <sub>20</sub> Electrochemical preparation method of composite thin film photocatalyst and its application

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preparation example Construction

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

[0019] In the first step, the Bi plate and Ti plate are polished, washed with absolute ethanol and distilled water, dried for later use, and prepared with a concentration of 5-20% NaBr and Na 2 SiO 3 ·9H 2 A mixed solution of 90-600 mL of 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, wherein distilled water and ethylene glycol are used. 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 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 , under m...

Embodiment 1

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

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

[0025] 3) Prepared BiOBr / Bi 12 SiO 20 Composi...

Embodiment 2

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

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

[0029] 3) Prepared BiOBr / Bi 12 SiO 20 Composit...

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Abstract

A biobr / bi 12 SIO 20 The electrochemical preparation methods and applications of composite film photocatalysts belong to the in situ preparation of BI base composite materials, solar photocatalyst fixation technology, and artificial optical synthesis fields.The problem, with BI board, NABR and NA 2 SIO 3 · 9H 2 O is raw materials, water / EG is a solvent, nitric acid or sodium hydroxide solution adjusts pH, uses TI board as cathode, and synthesizes BIOBR / BI through the electrochemical method at room temperature 12 SIO 20 Fixed composite film.The preparation method raw materials are cheap and easy to obtain, no need to high temperature and high pressure, the response conditions are mild and controllable, and the process is friendly to the environment and does not produce harmful by -products.

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 in particular relates to a BiOBr / Bi 12 SiO 20 Electrochemical preparation method of composite thin film photocatalyst and application thereof. 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 that researchers pay attention to. Bi-based photocatalysts are favored by researchers because of their cheap and readily available raw materials and excellent photocatalytic performance. Among them, BiOBr has a narrow bandgap characteristic (about 2.8 eV), which is determined by [Bi 2 O 2 ] l...

Claims

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Application Information

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Patent Type & Authority Patents(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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