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A kind of tantalum oxychloride micron cubic crystal photocatalyst and its preparation method and application

A cubic crystal and photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, tantalum compounds, etc., can solve problems such as product defects

Inactive Publication Date: 2017-06-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently obtained tantalum oxides with single crystal properties often need to introduce strong corrosive HF acid in the synthesis, which will inevitably lead to the existence of defects in the products; and the prepared products are all one-dimensional nanostructures, with the same exposed facet

Method used

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  • A kind of tantalum oxychloride micron cubic crystal photocatalyst and its preparation method and application
  • A kind of tantalum oxychloride micron cubic crystal photocatalyst and its preparation method and application
  • A kind of tantalum oxychloride micron cubic crystal photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 0.6mmol TaCl 5 Dissolve in 15ml of concentrated hydrochloric acid with a mass fraction of 38% until the solution is clear. Add 30ml of glacial acetic acid into the above solution, stir until the bubbles disappear; transfer the mixed solution (the molar ratio of HCl to carboxylic acid is 1:2.82) into a 50ml reactor; heat the reactor at 200°C for 10 hours, Then cool naturally, collect the precipitate, and dry it in a desiccator at normal temperature to obtain a micron cubic crystal of tantalum oxychloride.

[0039] Refer to attached Figure 1-6 shown by figure 1 From the field emission scanning electron microscope image of the product of this example, it can be seen that the obtained product is a micron cube of 0.2-1.5 μm; figure 2 The array-like spots in the electron diffraction pattern pool indicate that the micron cube has a single crystal property; image 3 Powder X-ray Diffraction Pattern and Figure 4 X-ray photoelectron spectroscopy combined with XRF charact...

Embodiment 2

[0043] Adjust the temperature in Example 1 to 100°C (that is, heating at 200°C is changed to heating at 100°C), repeat the steps in Example 1 above, and obtain the product, which is a micron cube of 1.2-3 μm, The structure and morphology of the product were characterized by field emission scanning electron microscopy and X-ray energy spectroscopy, such as Figure 8 As shown, it shows that the obtained product is micron cubic crystal of tantalum oxychloride, and the molecular formula is TaO (5-x) / 2 Cl x (x=0.64).

Embodiment 3

[0045] TaCl in embodiment 1 5 The amount of the substance is increased to 1mmol, and the steps of the above example 1 are repeated to obtain the product. The resulting product is a micron cube of 0.7-1.5 μm, and the structure and morphology of the product are carried out by field emission scanning electron microscope and X-ray energy spectrum. representation, such as Figure 9 As shown, it shows that the obtained product is micron cubic crystal of tantalum oxychloride.

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Abstract

The invention discloses a tantalum oxide chlorine micron cubic crystal photocatalyst as well as a preparation method and application thereof. The preparation process comprises the following steps: dissolving Ta5+ tantalate in a mixed solution of concentrated hydrochloric acid and carboxylic acid, wherein the molar ratio of HCL to carboxylic acid is 1:(1.4-5.6); performing hydrolysis reaction on the mixed solution containing tantalate at a temperature of 100-240 C degree for 3-18 hours; cooling naturally, filtering and collecting precipitate and drying to obtain the tantalum oxide chlorine micron cubic crystal. The preparation method is simple, moderate in reaction and good in repeatability and can be widely applied to preparation of a single crystal structure of metal oxide of which the precursor is hydrolyzed rapidly; the micron cubic crystal is high in crystallization degree, strong in light absorption ability, high in charge migration efficiency and has a relatively strong photocatalytic hydrogen generation ability and a wide application prospect in the field of solar energy utilization and photochemistry conversion.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic hydrogen production, and in particular relates to a tantalum oxychloride micron cubic crystal photocatalyst and a preparation method and application thereof. Background technique [0002] Semiconductor photocatalytic hydrogen production uses the photoelectric effect of semiconductors to decompose water to produce hydrogen by exciting electrons and holes through sunlight. The conduction band of tantalum-based oxide semiconductors is the Ta5d orbital, which has a more negative conduction band position, and is suitable for photocatalytic reduction of H + has significant advantages. "Catalysis Today" magazine (Catalysis today, 1996, volume 28, page 175) reported Ta 2 o 5 It has the ability to split water under ultraviolet light irradiation. However, since tantalum-based precursors usually have a fast hydrolysis rate, it is difficult to control the nucleation and growth rate of tantalum oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06C01G35/00C01B3/02
CPCY02P20/133
Inventor 官建国涂浩许蕾蕾
Owner WUHAN UNIV OF TECH
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