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Preparation method of tantalum oxyfluoride nanosheets

A nano-sheet and nano-powder technology, applied in chemical instruments and methods, inorganic chemistry, tantalum compounds, etc., can solve the problems of less synthesis research, the inability of powder to be applied in the fields of photocatalysis and electrocatalysis, and low specific surface area. high purity effect

Active Publication Date: 2020-05-12
SHANDONG UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, on TaO 2 There are very few synthetic studies of F, Frevel and Rinn in the paper "The crystal structure of NbO 2 Fand TaO 2 In F”, dissolve metal tantalum powder in a Pt crucible filled with concentrated hydrofluoric acid, then slowly evaporate to dryness at 80°C, and calcinate the obtained white powder at 250°C in an air atmosphere for 1 hour to obtain TaO 2 F powder, but prepared TaO 2 F particle size is large and highly aggregated
TaO with large particle size and low specific surface area 2 F powder cannot be used in the field of photocatalysis and electrocatalysis

Method used

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  • Preparation method of tantalum oxyfluoride nanosheets
  • Preparation method of tantalum oxyfluoride nanosheets
  • Preparation method of tantalum oxyfluoride nanosheets

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Embodiment 1

[0026] Prepare TaO in this embodiment mode 2 The method of F nanosheets is as follows: (NH4) 2 Ta 2 o 3 f 6 Nanomaterials are used as precursors. In an air atmosphere (containing oxygen), the temperature is raised to 400°C at a rate of 5°C / min and kept for 3 hours. After cooling with the furnace, TaO 2 F nanosheets.

[0027] The (NH4) used in this embodiment 2 Ta 2 o 3 f 6 The preparation method of the precursor is as follows:

[0028] Metal tantalum powder, hydrofluoric acid with a mass fraction of 40%, analytically pure acetic acid, urea and deionized water are used as raw materials. The steps are as follows: (1) Mix hydrofluoric acid and metal tantalum powder at a molar ratio (3-12): 1, and stir well until the metal tantalum powder is dissolved; (2) Mix deionized water and glacial acetic acid according to the volume ratio ( 0.17~6): 1 mixed evenly; and the acetic acid solution was gradually dropped into the mixed solution obtained in step (1) to obtain a milky whi...

Embodiment 2

[0032] The present embodiment is different from Example 1 in that (NH4) prepared by hydrothermal method 2 Ta 2 o 3 f 6 Nanopowder is used as a precursor; in an air atmosphere (containing oxygen), the temperature is raised to 500°C at a rate of 5°C / min for 3 hours. You can get TaO 2 F nanosheets. Others are the same as in Example 1.

[0033] The prepared TaO 2 F powder is subjected to X-ray diffraction phase analysis (XRD), and the XRD spectrum obtained from the test is as follows image 3 shown. The corresponding diffraction card is PDF-01-076-2370. There is no other impurity phase in this spectrum, and the intensity of the XRD peak is high. Explain that the TaO obtained after heat treatment 2 F has good crystallinity and is single-phase, high-purity, and almost free of impurity phases.

[0034] Figure 4 For the prepared TaO 2 A typical scanning electron microscope (SEM) image of F sample, which shows that the formed TaO 2 F powder is a nano sheet structure. Fi...

Embodiment 3

[0036] The present embodiment is different from Example 1 in that (NH4) prepared by hydrothermal method 2 Ta 2 o 3 f 6 Nanopowder is used as a precursor; in an air atmosphere (containing oxygen), the temperature is raised to 350°C at a rate of 1°C / min for 5 hours. You can get TaO 2 F nanosheets. Others are the same as in Example 1.

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Abstract

The invention provides a preparation process of a TaO2F nanosheet, and belongs to the technical field of nano material preparation. The invention particularly relates to a heat treatment method taking(NH4)2Ta2O3F6 as a precursor, wherein the preparation method includes the following steps: taking (NH4) 2Ta2O3F6 nano-powder synthesized by a hydrothermal method as a precursor; and (1) in an air (oxygen-containing) atmosphere, heating the precursor to 350-500 DEG C at a heating rate of 1-100 DEG C / min, and keeping the temperature for 0.5-5 hours; or (2) in an argon atmosphere (inert oxygen-freeatmosphere), heating the precursor to 350-700 DEG C at a heating rate of 1-10 DEG C / min, and keeping the temperature for 0.5-5 hours to obtain the TaO2F nanosheet. The TaO2F nanosheet has great application potential in the fields of photocatalysis and electrocatalysis.

Description

technical field [0001] The present invention relates to a kind of TaO 2 The invention relates to a preparation method of F nanosheets, which belongs to the technical field of preparation of nanometer materials; in particular, it relates to a heat treatment method of a precursor. Background technique [0002] With the rapid development of social economy, environmental pollution and energy shortage have become two major problems to be solved in the world, prompting people to find and utilize low-cost, high-efficiency and environmentally friendly sustainable energy conversion technologies. In order to solve the problems of increasing energy consumption and environmental pollution, the development of renewable resources such as clean water energy and solar energy has attracted human attention. Among them, electrolysis of water is considered to be one of the most effective methods for large-scale hydrogen production. Currently noble metals platinum and ruthenium oxide are the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G35/00B01J27/12
CPCC01G35/00B01J27/12C01P2004/20B01J35/33B01J35/39
Inventor 耿欣温广武邱鹏程杨玉茹李俐
Owner SHANDONG UNIV OF TECH