Bi2WO6 photocatalysis membrane loaded by base with high specific surface, method and application thereof

A technology of high specific surface area and photocatalytic film, applied in chemical instruments and methods, applications, separation methods, etc., can solve problems affecting the effective area of ​​catalysts, unfavorable environmental purification applications, small specific surface area of ​​substrates, etc., and achieve good cycle stability Sexuality, low production cost, easy recycling and reuse

Inactive Publication Date: 2010-06-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the immobilization of nano-photocatalysts overcomes the shortcomings of difficult separation and recovery of catalysts in suspension systems, the specific surface area of ​​traditional substrates is small, which affects the effective area of ​​catalysts and reduces catalytic activity.
Bi 2 WO 6 Loaded on the traditional quartz substrate to prepare the photocatalytic film (J.Solid State Chem, 2007, 180, 1456), but the experimental results show that its photocatalytic degradation activity of rhodamine B (RhB) is low, which is not conducive to its environmental protection. Applications such as purification

Method used

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  • Bi2WO6 photocatalysis membrane loaded by base with high specific surface, method and application thereof
  • Bi2WO6 photocatalysis membrane loaded by base with high specific surface, method and application thereof
  • Bi2WO6 photocatalysis membrane loaded by base with high specific surface, method and application thereof

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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 0.97gBi(NO 3 ) 3 ·5H 2 O and 0.329gNa 2 WO 4 2H 2 O was dissolved in ethylene glycol respectively, and the above two solutions were mixed uniformly to obtain a clear solution, which was then transferred to a hydrothermal kettle and heated at 160°C for 16 hours. After the reaction, the obtained product was centrifuged, washed and then dried at 60° C. for 4 hours. Dip the clean stainless steel wire mesh in the evenly dispersed Bi 2 WO 6 In the ethanol suspension of nanopowders, the Bi 2 WO 6 Membrane, after drying, repeat the number of pulls until about 20gm on the load -2 Bi 2 WO 6 , and finally heat-treated at 200 °C to prepare the stainless steel mesh-loaded Bi 2 WO 6 photocatalytic film.

[0026] In order to study the performance of the prepared photocatalytic film in the application of sewa...

Embodiment 2

[0030] Adopt the method identical with embodiment 1, by stoichiometric ratio with Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O (analytically pure) is used as raw material, and ethylene glycol is used as solvent to synthesize Bi 2 WO 6 , and the Bi 2 WO 6 The nanopowder is loaded on the nickel foam substrate. After comparative experiments, the obtained Bi 2 WO 6 The film degraded 90% of RhB (such as Figure 4 shown).

Embodiment 3

[0032] Adopt the method identical with embodiment 1, by stoichiometric ratio with Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O (analytically pure) is used as raw material, and ethylene glycol is used as solvent to synthesize Bi 2 WO 6 , and the Bi 2 WO 6 Nanopowder loaded on porous TiO 2 on a ceramic sheet. After comparative experiments, the obtained Bi 2 WO 6 The film degraded 95% of RhB after 4 hours of irradiation with visible light with wavelength λ > 420 nm.

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Abstract

The invention relates to a Bi2WO6 photocatalysis membrane loaded by a base with a high specific surface, a method and application thereof. The preparation method comprises the following steps: firstly, Bi2WO6 nano-powder is prepared at the temperature of 60-300 DEG C, the clean base with the high specific surface is dipped into Bi2WO6 suspension to prepare a Bi2WO6 membrane, and finally the Bi2WO6 photocatalysis membrane loaded by the base with the high specific surface is prepared by heat treatment at the temperature of 100-950 DEG C. The bases with the high specific surface are a metal net,foam metal or porous ceramics; and the prepared Bi2WO6 membrane has the characteristics of small Bi2WO6 particle size, high photocatalysis activity, favourable cycle performance, simple preparation technology, low production cost and the like. Meanwhile, the photocatalysis membrane can be conveniently recycled and reused, thus solving the problem of difficult recovery in the practical applicationof a nanometer photochemical catalyst. The invention can be used for RhB degradation, air purification and photocatalysis antibacterial activity under visible light.

Description

technical field [0001] The present invention relates to photocatalytic film and application, especially Bi 2 WO 6 A photocatalytic film, a preparation method, and its application to realize environmental purification under visible light irradiation. Background technique [0002] Industrial development not only brings rapid changes to human life, but also poses a huge threat and harm to the environment on which human beings live. The oil crisis in the early 1970s not only brought about the rapid development of photoelectrochemistry, but also aroused widespread attention in the field of photocatalysis. Photocatalysis has the characteristics of mild reaction conditions, strong oxidation, clean and environmental protection. In recent years, photocatalysis and its related technologies have shown good application potential in many aspects such as environmental governance, solar energy conversion, and antibacterial, and have developed rapidly. Especially, it has been extensively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J23/31B01J27/24B01J35/02B01J37/00A62D3/17B01D53/86B01D53/72A01N59/16A01N59/20A01P1/00C02F1/30C02F101/30A62D101/20
CPCY02W10/37
Inventor 王文中徐婕慧
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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