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A method for preparing bismuth oxyhalide nanosheets by electrochemical method

A nanosheet, electrochemical technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of template method condition control, uneven size, poor sample dispersion, etc., to achieve good Photocatalytic degradation activity, good crystallinity, and simple operation

Active Publication Date: 2021-06-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrothermal / solvothermal method needs to use a high-pressure reactor as a container, and the sheet-like BiOX can be prepared under high temperature and high pressure conditions, and the crystal growth environment often needs to be adjusted with the help of surfactants during the preparation process; high-temperature solid-phase method and water The solution method is difficult to accurately control the microscopic morphology and particle size of the synthesized sample, and has disadvantages such as poor sample dispersion and uneven microscopic morphology and size; the condition control of the template method is cumbersome, and the influence of the template removal step on the product needs to be considered

Method used

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  • A method for preparing bismuth oxyhalide nanosheets by electrochemical method
  • A method for preparing bismuth oxyhalide nanosheets by electrochemical method
  • A method for preparing bismuth oxyhalide nanosheets by electrochemical method

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Embodiment 1

[0038] (1) Add 50mL of 0.5mol·L to the cathode and anode electrolytic cells of H-Cell (100mL specification) -1 NaI solution;

[0039] (2) Take the size as 5mm 3 1. The metal Bi block with a purity of 99.99% is used as the cathode, and the Pt sheet electrode is used as the anode. The DC regulated power supply provides a voltage of 20V, and the cathode electrolytic cell is magnetically stirred under the electrified condition;

[0040] (3) After energizing for 5 hours, centrifuge the solution in the cathode electrolytic cell at 7500r for 5 minutes, wash the obtained precipitate with ultrapure water for 5 times, collect the product and dry it in an electric blast drying oven at 80°C for 4 hours to obtain Bi 5 o 7 I nanosheets.

[0041] To the Bi prepared in this embodiment 5 o 7 I nanosheets were tested by XRD, figure 1 For the XRD spectrum of the bismuth oxyiodide nanocrystals prepared in this example, it is proved that the prepared product is an orthorhombic phase Bi 5 o ...

Embodiment 2

[0044] (1) Add 50mL of 0.5mol·L to the cathode and anode electrolytic cells of H-Cell (100mL specification) -1 NaCl solution;

[0045] (2) Take the size as 5mm 3 1. The metal Bi block with a purity of 99.99% is used as the cathode, the Pt sheet electrode is used as the anode, and the DC regulated power supply provides a voltage of 15V. During the electrification process, the cathode electrolytic cell needs to be magnetically stirred;

[0046] (3) After energizing for 5 hours, the solution in the cathode electrolytic cell was centrifuged at 7500r for 5 minutes, the obtained precipitate was washed 4 times with ultrapure water, and the collected product was dried in an electric blast drying oven at 60°C for 6 hours to obtain Bi 4 o 5 Cl 2 Nanosheets.

[0047] To the Bi prepared in this embodiment 4 o 5 Cl 2 Nanosheets take transmission electron microscope pictures, image 3 Bi prepared for this embodiment 4 o 5 Cl 2 The TEM photo of the nanosheets was taken at 40,000 t...

Embodiment 3

[0049] (1) Add 50mL of 0.7mol·L to the cathode and anode electrolytic cells of H-Cell (100mL specification) -1 NaBr solution;

[0050] (2) Take the size as 5mm 3 1. The metal Bi block with a purity of 99.99% is used as the cathode, and the Pt sheet electrode is used as the anode. The DC regulated power supply provides a voltage of 20V, and the cathode electrolytic cell is magnetically stirred under the electrified condition;

[0051] (3) After 4 hours of electrification, the solution in the cathode electrolytic cell was centrifuged at 7500r for 5 minutes, the obtained precipitate was washed 5 times with ultrapure water, and the collected product was dried in an electric blast drying oven at 70°C for 5 hours to obtain Bi 4 o 5 Br 2 Nanosheets.

[0052] To the Bi prepared in this embodiment 4 o 5 Br 2 Nanosheets take transmission electron microscope pictures, Figure 4 Bi prepared for this embodiment 4 o 5 Br 2 The TEM photo of the nanosheets was taken at a magnificat...

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Abstract

The invention discloses a method for preparing bismuth oxyhalide nanosheets by an electrochemical method, and belongs to the technical field of micro / nano material preparation. The present invention adopts the electrochemical method to prepare BiOX (X=Cl, Br, I) under the voltage condition of 15-30V, uses the Pt sheet electrode as the anode, the metal Bi block as the cathode to provide the Bi source, and the NaCl, NaBr and NaI solution as the electrolyte solution and provide X ‑ . The prepared BiOX nanosheets have high purity, good crystallinity, obvious orientation growth and good photocatalytic degradation activity for RhB. Compared with BiOX prepared by the traditional hydrothermal method, the reaction is carried out under normal temperature and pressure, low energy consumption, high safety, strong feasibility, simple operation, very economical and practical, and has a good industrialization prospect.

Description

technical field [0001] The invention relates to a method for preparing bismuth oxyhalide nanosheets by an electrochemical method, and belongs to the technical field of micro / nano material preparation. Background technique [0002] Bismuth oxyhalide BiOX (X=Cl, Br, I), as a ternary structure (V-VI-VII) oxide semiconductor material, has a unique highly anisotropic layered structure and high chemical stability of Sillen bismuth compounds. It exhibits excellent electrical, magnetic and optical properties. In 2006, Huang et al first reported that BiOCl as a photocatalyst had good photocatalytic activity for the degradation of methyl orange[Huang Fuqiang, Zhang Kelei, LiuCunming, et al.Study of the electronic structure and photocatalytic activity of the BiOCl photocatalyst[J].Applied Catalysis B: Environmental, 2006 (68) 125-129], followed by Zhang et al. using ethylene glycol solvothermal method to prepare microspherical BiOX (X=Cl, Br, I) stacked by nanosheets, and calculated t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06B01J35/02B01J35/00B01J37/34B82Y40/00
CPCB01J27/06B01J37/348B82Y40/00B01J35/39B01J35/40
Inventor 张颖王丹朱永法娄阳潘成思
Owner JIANGNAN UNIV
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