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Preparation method for three-dimensional ordered macroporous Bi2WO6 photocatalysis materials

A photocatalytic material and a three-dimensional ordered technology, applied in the field of photocatalytic materials, can solve the problems of inability to show the photonic crystal effect, increase the utilization rate of light energy, and achieve significant photocatalytic activity, easy large-scale production, and strong control effect

Inactive Publication Date: 2014-07-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the ordered macroporous Bi obtained by this approach 2 WO 6 The pore diameter of the film is above 400nm, and the photonic crystal effect cannot be displayed under vertical illumination, so the purpose of improving the photocatalytic performance by increasing the utilization rate of light energy cannot be achieved

Method used

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  • Preparation method for three-dimensional ordered macroporous Bi2WO6 photocatalysis materials
  • Preparation method for three-dimensional ordered macroporous Bi2WO6 photocatalysis materials
  • Preparation method for three-dimensional ordered macroporous Bi2WO6 photocatalysis materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1.03g Bi(NO 3 ) 3 ·5H 2 O and 0.27g phosphotungstic acid are dissolved in the mixed solution that is formed by the nitric acid aqueous solution of 10mL dehydrated alcohol and 4mL4mol / L, stir to form transparent precursor solution;

[0033] Monodisperse SiO 2 The nanosphere particles were centrifuged at 10,000 rpm for 10 min, and then dried at 50 °C for 12 h to obtain bulk three-dimensional ordered SiO 2 Photonic crystal template;

[0034] The obtained bulk three-dimensional ordered SiO 2 The photonic crystal template is immersed in the prepared transparent precursor solution, dried at 60°C to form a solid block, and then fumigated in an ammonia atmosphere at 70°C for 24 hours;

[0035] Again dried at 60 °C to a lumpy solid and then calcined at 450 °C for 2 h to obtain crystalline Bi 2 WO 6 ;

[0036] The crystalline Bi obtained by immersing in 2mol / L aqueous sodium hydroxide solution 2 WO 6 48 hours to remove the SiO 2 Photonic crystal template, the sample is...

Embodiment 2

[0046] The only difference between this embodiment and Example 1 is that the transparent precursor solution is made of 0.67g BiCl 3 and 0.27g of phosphotungstic acid are dissolved in a mixed solution formed by 10mL of absolute ethanol and 4mL of 4mol / L hydrochloric acid aqueous solution.

[0047] The rest of the content is exactly the same as described in Example 1.

[0048] After detection and analysis, it is known that the three-dimensional ordered macropore Bi obtained in this embodiment 2 WO 6 The photocatalytic material is also an orthorhombic phase Bi with a grain size of about 8nm. 2 WO 6 It is a nanometer material, and has an ordered three-dimensional pore structure with an average pore diameter of about 90 nm.

[0049] The three-dimensional ordered macropore Bi obtained in this example 2 WO 6 The photocatalytic material has a phenol degradation rate of 70% under the same conditions as in Example 1.

Embodiment 3

[0051] The difference between this example and Example 1 is that the mixed solution used to form the transparent precursor solution is formed by 10 mL of ethylene glycol and 4 mL of 4 mol / L nitric acid aqueous solution.

[0052] The rest of the content is exactly the same as described in Example 1.

[0053] After detection and analysis, it is known that the product of this example is determined to be the orthorhombic phase Bi by XRD component analysis. 2 WO 6 , but no macroporous Bi was observed by electron microscopy 2 WO 6 , the shape of the sample is irregular granular.

[0054] And the degradation rate of the phenol under the same conditions as in Example 1 is only 25%, and the photocatalytic performance is relatively poor.

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Abstract

The invention discloses a preparation method for three-dimensional ordered macroporous Bi2WO6 photocatalysis materials. The method is of a template method and comprises the steps of: preparing transparent precursor solution; preparing a blocky three-dimensional ordered Si2O2 photonic crystal template; soaking the prepared blocky three-dimensional ordered Si2O2 photonic crystal template into the transparent precursor solution, and stifling at ammonia atmosphere after being dried into blocky solid at 50-70 DEG C; forging at 400-500 DEG C; and soaking with aqueous alkali and the like. Due to existence of photonic band gaps, the three-dimensional ordered macroporous Bi2WO6 photocatalysis materials prepared by the method can more effectively absorb ultraviolet light being about 230nm, has obvious photocatalysis activity, and can be used for degrading benzene organic pollutant which is difficulty degraded under natural conditions, thus having application prospects; the preparation method disclosed by the invention is not required for special equipment and severe conditions, is simple in process, strong in controllability, and can realize large-scale production and has practicability easily.

Description

technical field [0001] The present invention relates to a Bi 2 WO 6 The preparation method of photocatalytic material, in particular, involves a three-dimensional ordered macroporous Bi 2 WO 6 The invention discloses a method for preparing photocatalytic materials, belonging to the technical field of photocatalytic materials. Background technique [0002] Due to the increasing environmental pollution, the research and application of semiconductor photocatalytic technology has attracted widespread attention. Photocatalysis technology is the process of using photocatalyst to absorb light to decompose organic matter. The mechanism is that the semiconductor photocatalyst is excited by light to generate non-equilibrium carriers, that is, photogenerated electrons and holes. After the electrons and holes migrate to the semiconductor surface, due to their strong oxidation and reduction capabilities, they can be removed from the organic pollutants that come into contact with them...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31C01G41/00
Inventor 王文中孙松美
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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