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Bi2WO6 nano-fiber cloth and preparation method and application thereof

A nanofiber and fiber technology, which is applied in the field of Bi2WO6 nanofiber cloth, preparation and application, can solve the problems of reduced catalytic performance and reduced surface area of ​​catalyst, and achieve the effects of short cycle, convenient recycling and reuse, and simple preparation process

Inactive Publication Date: 2009-12-30
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

However, the surface area of ​​the catalyst decreases after loading, and the catalytic performance also decreases.

Method used

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  • Bi2WO6 nano-fiber cloth and preparation method and application thereof
  • Bi2WO6 nano-fiber cloth and preparation method and application thereof
  • Bi2WO6 nano-fiber cloth and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Bi 2 WO 6 Using Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O (analytical pure) is synthesized as a raw material, and according to the stoichiometric ratio, weigh 0.97g Bi(NO 3 ) 3 ·5H 2 O (analytical grade) was dissolved in 20 mL of ethanol, and then 0.329 g of Na 2 WO 4 2H 2 O (analytically pure), 1g of PVA was stirred to form a white suspension precursor. Then put the precursor solution into the syringe for electrospinning. After comparative experiments, the working distance is 10cm and the working voltage is 20KV. After the reaction, the obtained nanofiber cloth was sintered at 500°C. Such as figure 1 , according to XRD composition analysis and Debye Scherer formula calculation, the nanofiber Bi composed of about 100nm particles was obtained 2 WO 6 . Figure 2 is a typical scanning electron micrograph of the spinning sample. It can be seen from the figure that the diameter of the self-supporting nanofiber is about 150nm, which is actually made of nano-Bi ...

Embodiment 2

[0029] Bi 2 WO 6 Using bismuth citrate and Na 2 WO 4 2H 2 O (analytical pure) is synthesized as a raw material, according to the stoichiometric ratio, weigh 0.796g bismuth citrate (analytical pure) and dissolve it in 20mL of ethanol, then add 0.329gNa 2 WO 4 2H 2 O (analytically pure), 0.5g PEO was stirred to form a white suspension precursor. Then put the precursor solution into the syringe for electrospinning. After comparative experiments, the working distance was selected as 20cm, and the working voltage was 25KV. After the reaction, the obtained nanofiber cloth was sintered at 400°C. The product was determined to be Bi by XRD component analysis 2 WO 6 , the particle size is about 200nm observed by electron microscope, and visible light with a wavelength > 420nm degrades acetaldehyde to produce CO 2 Experimental result is slightly lower than embodiment 1, CO 2 The concentration is 117ppm.

Embodiment 3

[0031] Bi 2 WO 6 Using bismuth oxalate and H 40 N 10 o 41 W 12 ·xH 2 O (analytical pure) is synthesized as a raw material, according to the stoichiometric ratio, weigh 1.617g bismuth oxalate (analytical pure) and dissolve it in 20mL ethanol, then add 0.329g Na 2 WO 4 2H 2 O (analytically pure), 1g of PVP was stirred to form a white suspension precursor. Then put the precursor solution into the syringe for electrospinning. After comparative experiments, the working distance is 25cm and the working voltage is 10KV. After the reaction, the obtained nanofiber cloth was sintered at 550°C. The product was determined to be Bi by XRD component analysis 2 WO 6 , the particle size is about 300nm observed by electron microscope, and visible light with a wavelength > 420nm degrades acetaldehyde to produce CO 2 Experimental result is lower than embodiment 1, CO 2 The concentration is 95ppm.

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Abstract

The invention relates a Bi2WO6 nano-fiber cloth and a preparation method and an application thereof. The nano-fiber cloth is characterized in that the nano-fiber is prepared from Bi2WO6 nano-fiber with a length of hundreds of microns and a diameter of 30-400nm by electrostatic spinning; wherein, a defined amount of reactants are mixed and stirred according to a stoichiometry ratio, then proper tackifier is added to obtain Bi2WO6 precursor with proper viscosity and charge quantity, and finally Bi2WO6 nano-fiber cloth with controllable size, crystal type and morphology can be obtained through the control of the proportioning of each material in the precursor solution and the conditions of the electrostatic spinning. The Bi2WO6 nano-fiber cloth prepared by the electrostatic spinning used as photocatalyst has high specific area and crystallinity so that the visible light activity of the cloth is high, a certain kind of organic pollutants can be degraded in short time, and meanwhile, the catalyst can be recycled and reused very conveniently so that the problem of practical application of photocatalyst is solved.

Description

technical field [0001] The present invention relates to visible light response photocatalyst, preparation method and application, particularly relate to Bi 2 WO 6 Nanofiber cloth, method of preparation, and use thereof to decompose harmful chemicals under light. Belongs to Bi 2 WO 6 materials and applications. Background technique [0002] Due to the increasing environmental pollution and energy crisis in the world, the research and application of semiconductor photocatalysis have attracted widespread attention. The core issue of photocatalytic technology is the design, development and development of suitable photocatalysts, especially the research on high-performance photocatalytic materials that respond to visible light has become a top priority. In 1999, Kudo et al. (Chem.Lett.1999, 83, 1103.) reported Bi 2 WO 6 As a new photocatalyst with visible light activity, the traditional high-temperature solid-state sintering method is used. Since then, Bi has been prepare...

Claims

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Application Information

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IPC IPC(8): B01J23/31B01J35/02B01J37/08A62D3/10A62D101/28
Inventor 王文中尚萌
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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