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Preparation method of sunlight-responding mesoporous Bi2WO6 microspheres

A technology of sunlight and microspheres, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as limiting the use of sunlight, and achieve high photocatalytic activity, low cost, and high yield. Effect

Inactive Publication Date: 2012-10-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to TiO 2 With a wide band gap (3.2eV), it can only be excited by ultraviolet light, thus limiting its use of sunlight (only 4% in the ultraviolet region)

Method used

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  • Preparation method of sunlight-responding mesoporous Bi2WO6 microspheres
  • Preparation method of sunlight-responding mesoporous Bi2WO6 microspheres
  • Preparation method of sunlight-responding mesoporous Bi2WO6 microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A solar-light-responsive mesoporous Bi 2 WO 6 The preparation method of the microspheres is prepared by a hydrothermal method, and the steps are as follows:

[0023] 1) Mix 0.002mol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 20mL of distilled water to prepare bismuth nitrate suspension;

[0024] 2) Under the condition of magnetic stirring, 0.001mol Na 2 WO 4 2H 2 O was dissolved in 20mL distilled water to obtain an aqueous solution of sodium tungstate;

[0025] 3) Add the sodium tungstate aqueous solution dropwise to the bismuth nitrate suspension under magnetic stirring conditions to prepare the precursor solution;

[0026] 4) Put the precursor solution into a 50mL PTFE-lined hydrothermal kettle for hydrothermal reaction. The filling capacity of the precursor solution is 80%, the hydrothermal temperature is 150°C, and the hydrothermal reaction time is 24h;

[0027] 5) The product after the hydrothermal reaction was centrifuged, washed with water and absolute ethanol...

Embodiment 2

[0033] A solar-light-responsive mesoporous Bi 2 WO 6 The preparation method of the microspheres is basically the same as in Example 1, except that the hydrothermal temperature is 120°C.

[0034] The sample prepared in this example shows that it is the Bi of orthorhombic system through XRD analysis. 2 WO 6 structure, such as figure 1 As shown in b, the sample is composed of flake-like particles, and its photocatalytic degradation efficiency of rhodamine B is 92% after 60 min of simulated sunlight irradiation.

Embodiment 3

[0036] A solar-light-responsive mesoporous Bi 2 WO 6 The preparation method of the microspheres is basically the same as in Example 1, except that the hydrothermal temperature is 180°C.

[0037] The sample prepared in this example shows that it is the Bi of orthorhombic system through XRD analysis. 2 WO 6 structure, and found that its crystallinity is higher, such as figure 1As shown in c, the sample is mainly composed of microspherical particles. Under simulated sunlight irradiation, the photocatalytic degradation efficiency of rhodamine B can reach 100% after 60 minutes of reaction.

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Abstract

The invention discloses a preparation method of sunlight-responding mesoporous Bi2WO6 microspheres with a hydro-thermal method. The preparation method comprises the following steps of: dissolving bismuth nitrate and sodium tungstate into water respectively; dropwise adding a sodium tungstate aqueous solution into a bismuth nitrate suspension under a magnetic stirring condition to obtain a precursor liquid; putting the precursor liquid into a hydro-thermal kettle for performing a hydro-thermal reaction for 24 hours, wherein the filling volume of the precursor liquid is 80 percent, and the hydro-thermal temperature range is 120-180 DEG C; and centrifugally separating a product obtained after the hydro-thermal reaction, cleaning with water and absolute ethyl alcohol, and drying in the air of 80 DEG C to obtain powder serving as the sunlight-responding mesoporous Bi2WO6 microspheres. The preparation method has the advantages: (1) the hydro-thermal method for preparing a Bi2WO6 photocatalyst is simple, low in cost and environment-friendly, and has high yield; and (2) the Bi2WO6 microspheres with mesoporous structures can be used for realizing rapid degradation of organic pollutants by using sunlight, and have high photocatalytic activity.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic oxidation, in particular to a solar light-responsive mesoporous Bi 2 WO 6 Preparation method of microspheres. [0002] Involves the preparation of mesoporous Bi with solar light response and high photocatalytic activity by a simple hydrothermal method 2 WO 6 photocatalyst, Bi prepared by this method 2 WO 6 Photocatalysts are hierarchical three-dimensional microspheres assembled from nanosheets. Background technique [0003] Heterogeneous photocatalysis has attracted extensive attention due to its potential in solar energy utilization and environmental restoration. Titanium dioxide (TiO 2 ) as a stable and non-toxic photocatalyst has been widely used in air purification and water pollution treatment. However, due to TiO 2 With a wide band gap (3.2eV), it can only be excited by ultraviolet light, thus limiting its use of sunlight (only 4% of the ultraviolet region). Therefore, prepa...

Claims

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Application Information

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IPC IPC(8): B01J23/31B01J35/10
Inventor 葛明刘璐
Owner NANKAI UNIV
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