CN101623630A - Bi*WO*/oxide fiber cloth with multistage heterogeneous structure, method and application - Google Patents

Bi*WO*/oxide fiber cloth with multistage heterogeneous structure, method and application Download PDF

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CN101623630A
CN101623630A CN200910055362A CN200910055362A CN101623630A CN 101623630 A CN101623630 A CN 101623630A CN 200910055362 A CN200910055362 A CN 200910055362A CN 200910055362 A CN200910055362 A CN 200910055362A CN 101623630 A CN101623630 A CN 101623630A
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fiber cloth
tio
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CN101623630B (en
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王文中
尚萌
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Shanghai Institute of Ceramics of CAS
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Abstract

The invention relates to Bi2WO6/oxide nanofiber cloth with a multistage heterogeneous structure, a prepration method and an application. The method combines the electrospinning and alcohol-thermal synthesis technology and prepares the Bi2WO6/TiO2 or Bi2WO6/ZnO fiber cloth with the multistage heterogeneous structure, Bi2WO6 nanosheets with the side length of 50-200nm and the thickness of 10-40nm are grown on mutually orderly interwoven TiO2 fiber or ZnO fiber with the diameter of 100-500nm in an inclined manner, wherein, the Bi2WO6 nanosheets consist of Bi2WO6 nanoparticles with the dimension of 10-40nm. The Bi2WO6/TiO2 or ZnO fiber cloth with the multistage heterogeneous structure has the advantages of greater strength, smaller particle size, larger specific surface area and the multistage heterogeneous structure, thereby having important applications in solar cells, photocatalysis, self-cleaning and other aspects.

Description

Bi with multistage heterogeneous structure 2WO 6/ oxide fiber cloth, method and application
Technical field
The present invention relates to the preparation and the application of visible light responsive photocatalyst, particularly have the Bi of multistage heterogeneous structure 2WO 6/ oxide fiber cloth and preparation method, and utilize it under illumination, to decompose harmful chemical.
Background technology
Because environmental pollution and the energy crisis that increase the weight of day by day in the whole world, the research of conductor photocatalysis and application have caused people's extensive concern.The key problem of photocatalysis technology is the appropriate light catalyst design, exploitation and development, and the research of particularly visible light-responded high-performance optical catalysis material becomes the task of top priority.The more novel photocatalysis agent of report at present has Bi 2WO 6, BiVO 4, CaBi 2O 4Composite oxides Deng containing metal element bismuth.Yet develop this class novel photocatalysis agent at present, though at visible-range one provisioning response is arranged, the diameter of particle owing to than large scale causes single photocatalytic activity lower.Because particle diameter is bigger on the one hand, cause specific area not high, because light induced electron and hole migration distance are longer, cause compound inactivation easily on the other hand.There is report (Catal.Commun.2005,6,185) to adopt carried noble metal to form heterojunction structure, so that promote the electron hole to separate, but because cost is higher, degradation reason under the adsorption rate, unsuitable practical application.In addition, reduce catalysis material size, to increase surface area, form multilevel hierarchy etc. also be the approach (Chem.Rev.1995,95,69) that effectively promotes photocatalysis efficiency.But after particle reduced, if adopt the heterogeneous catalytic reaction system that suspends, what bring was the difficult problem that granule separates from system, and it is difficult to reclaim.Therefore the load technology of photochemical catalyst becomes the direction that people make great efforts.Yet load rear catalyst surface area descends, and catalytic performance also decreases.So, seek not only cheapness but also can keep high activity, can realize the method that rapidly and efficiently reclaims of catalysis material, become the march toward key of practical application of photocatalysis technology.Electrostatic spinning technique is a kind of method of fast-developing in recent years preparation nanometer of getting up to the micro-meter scale fiber.For catalysis material, by the recovery and reuse easily of fibrous nano-fiber cloth.Present favourable electricity consumption spining technology synthesizes TiO 2, SiO 2Deng the report (Nano Lett.2003,3,555) of photochemical catalyst, and also never there is report in composite oxides visible light photocatalysis field.Consider that novel bismuthino composite oxide material and pure hot legal system are equipped with the advantage of the multistage material of small scale, utilize two kinds of technology with Bi 2WO 6And TiO 2Compound Deng oxide will be a promising brand-new trial.
Summary of the invention
The object of the present invention is to provide a kind of bismuth tungstate/oxidate nano fiber cloth Preparation Method and application with multistage heterogeneous structure, described oxide is TiO 2Or ZnO, it is low and have a high visible activity to synthesize cost, simultaneously the Bi that easily reclaims again 2WO 6/ TiO 2Or Bi 2WO 6/ ZnO photochemical catalyst.
A kind of Bi of the present invention with multistage heterogeneous structure 2WO 6/ TiO 2Or Bi 2WO 6/ ZnO fiber cloth is that the length of side that is prepared by the hot method of alcohol is that 50～200nm, thickness are the Bi of 10～40nm 2WO 6The diameter that interweaves in order mutually that nanometer sheet tilts to be grown in the method for electrostatic spinning preparation is the TiO of 100～500nm 2Or on the ZnO fiber, Bi wherein 2WO 6Nanometer sheet is again by the Bi that is of a size of 10～40nm 2WO 6Nano particle is formed.
For convenient narration preparation method, below with Bi 2WO 6/ TiO 2Nano-fiber cloth is an example:
(a) TiO 2The preparation of precursor sol
Described electrostatic spinning TiO 2Precursor sol is that 2～10% polyvinylpyrrolidone (PVP), 11～22% acetic acid, 5～45% butyl titanate and surplus ethanol are formed, and it is mixed by mass percentage concentration.
(b) nano-TiO under the electrostatic spinning condition 2The preparation of fiber cloth
At room temperature, above-mentioned presoma is joined in the electrospinning device, make presoma in injection apparatus with TiO 2The form ejection of nano wire obtains TiO on receiving system 2The fiber cloth that the presoma nano wire is formed.The TiO that obtains 2Precursor fibre cloth was 500 ℃ of sintering 2 hours, and obtaining diameter is the TiO of 100～500nm 2Fiber cloth.
(c) Bi 2WO 6The preparation of presoma
Alcohol thermal synthesis Bi 2WO 6Presoma be to be that 0.0025M～0.025M is by Bi by molar concentration 2WO 6The salt that contains bismuth ion and tungsten ion that stoichiometric proportion is formed, and alcohol is as solvent composition.
The described salt that contains bismuth ion is nitrate, oxalates, citrate etc.; The salt of described tungstenic is sodium salt or ammonium salt etc.; Described alcohol is ethanol, ethylene glycol, glycerine etc.
(d) Bi of multistage heterogeneous structure under the pure heat condition 2WO 6/ TiO 2The preparation of fiber cloth
With Bi 2WO 6Presoma and nano-TiO 2Fiber cloth joins in the pure hot still container, wherein Bi 2WO 6Presoma and nano-TiO 2The mass ratio of fiber cloth is 2000: 1～40: 1, will put into baking oven after the seal of vessel, 100～200 ℃ of temperature alcohol heat 5～24 hours, makes Bi 2WO 6Nano particle forms nanometer sheet, and further growth is at TiO 2On the fiber cloth, form multistage heterogeneous structure.
The present invention has following advantage:
(a), obtain to have the Bi of multistage heterogeneous structure in conjunction with electrostatic spinning and pure thermal synthesis technology of preparing 2WO 6/ TiO 2Fiber cloth.
(b) Zhi Bei Bi with multistage heterogeneous structure 2WO 6/ TiO 2Fiber cloth has the self-supporting performance, and fiber length can reach microns up to a hundred, and diameter can be regulated and control arbitrarily by 100～500nm, and distributes than homogeneous.Can form large-area fiber cloth, Bi on the microcosmic on the macroscopic view 2WO 6Nanometer sheet tilts to be grown in the TiO that interweaves in order mutually 2On the fiber, Bi wherein 2WO 6Nanometer sheet is again by Bi 2WO 6Nano particle is formed.
(c) preparation technology is simple, and the cycle is short, and cost is low, is fit to produce in batches.
(d) prepared Bi with multistage heterogeneous structure 2WO 6/ TiO 2Fiber cloth or Bi 2WO 6/ ZnO fiber cloth not only can be implemented under the radiation of visible light as photochemical catalyst and excites, and also has high photolytic activity, the pollutant of certain kind of can degrading at short notice.Photocatalytic Activity for Degradation efficient is than the powder of other method preparation and the Bi that does not have heterojunction structure 2WO 6And TiO 2Exceed several times.At solar cell, photocatalysis, aspects such as automatically cleaning, and as organic pollution degraded, indoor-outdoor air purification, vehicle exhaust processing, photochemical catalyzing, aspect such as antibiotic good prospects for application is arranged in environmental improvement (empty G﹠W), be a kind of effective visible light catalyst.
(e) prepared Bi 2WO 6/ TiO 2Fiber cloth or Bi 2WO 6The recovery and reuse easily of/ZnO fiber cloth have solved the difficult problem of photochemical catalyst practical application.
Description of drawings
Fig. 1 is the Bi of preparation among the embodiment 1 2WO 6/ TiO 2Fiber cloth XRD diffracting spectrum.■ is TiO 2Characteristic peak, all the other are Bi 2WO 6Characteristic peak.
Fig. 2 is the Bi of preparation 2WO 6/ TiO 2The photomacrograph of fiber cloth
Fig. 3 is the Bi with multistage heterogeneous structure of preparation 2WO 6/ TiO 2The single fiber stereoscan photograph of fiber cloth
Fig. 4 is the Bi with multistage heterogeneous structure of preparation 2WO 6/ TiO 2Bi in the fiber cloth 2WO 6The transmission electron microscope photo of nano particle
Fig. 5 is the Bi with multistage heterogeneous structure of preparation 2WO 6/ TiO 2The transmission electron microscope photo of fiber cloth
Fig. 6 is the Bi with multistage heterogeneous structure of preparation 2WO 6/ TiO 2Fiber cloth, the Bi of solid phase method preparation 2WO 6/ TiO 2Powder, the Bi of pure hot method preparation 2WO 6The TiO of nano particle and method of electrostatic spinning preparation 2To acetaldehyde degradation rate correlation curve.
The specific embodiment
Embodiment 1
The TiO that electrostatic spinning is used 2Precursor sol is that 5% polyvinylpyrrolidone (PVP), 20% acetic acid, 20% butyl titanate and the ethanol of surplus are formed by mass concentration, and it is mixed.At room temperature, above-mentioned precursor sol is joined in the electrospinning device, make presoma in injection apparatus with TiO 2The form ejection of nano wire obtains TiO on receiving system 2The fiber cloth that the presoma nano wire is formed.The TiO that obtains 2Precursor fibre cloth obtains TiO 500 ℃ of sintering 2 hours 2Fiber cloth.
Alcohol thermal synthesis Bi 2WO 6With presoma be the 0.485g Bi (NO that 0.0125M forms by stoichiometric proportion by molar concentration 3) 35H 2O (analyzing pure) and 0.165g Na 2WO 42H 2O (analyzing pure) is dissolved in and forms in the 40mL ethylene glycol.With Bi 2WO 6Presoma and nano-TiO 2Fiber cloth joins in the pure hot still, wherein Bi 2WO 6Presoma and nano-TiO 2The mass ratio of fiber cloth is 800: 1, will still put into baking oven after the sealing, 160 ℃ of alcohol heat of temperature 12 hours, makes Bi 2WO 6Nano particle forms nanometer sheet, and further growth is at TiO 2On the fiber cloth, form the Bi of multistage heterogeneous structure 2WO 6/ TiO 2Fiber cloth.
As Fig. 1,, obtained Bi through the XRD constituent analysis 2WO 6With TiO 2Compound nanofiber.Fig. 2 is the Bi of multistage heterogeneous structure 2WO 6/ TiO 2The photomacrograph of fiber cloth, the fiber cloth that as can be seen from the figure has self-supporting can be prepared into about at least 10 centimetres of the length of sides, and its mass preparation easily is described.Fig. 3 is the Bi with multistage heterogeneous structure of preparation 2WO 6/ TiO 2The single fiber stereoscan photograph of fiber cloth, fibre diameter is about 200nm.Bi 2WO 6The about 100nm of the nanometer sheet length of side, thick 20nm, it is actual to be by Bi 2WO 6Nano particle is formed.Fig. 4 is the Bi with multistage heterogeneous structure of preparation 2WO 6/ TiO 2Bi in the fiber cloth 2WO 6The transmission electron microscope photo of nano particle, Bi as can be seen 2WO 6The about 20nm of nanoparticle size conforms to the analysis of Fig. 3 ESEM.Fig. 5 is the Bi with multistage heterogeneous structure of preparation 2WO 6/ TiO 2The transmission electron microscope photo of fiber cloth, as can be seen, Bi 2WO 6Nanometer sheet tilts to be grown in TiO 2On the fiber.
For research institute prepares the photocatalysis performance of sample, the design visible light is the experiment of degraded aldehydes gas down.Utilize the acetaldehyde photocatalytic degradation to be CO 2Character, by gas chromatographic measurement CO 2Output is judged the variation of aldehydes gas, and then draws degradation rate.In order to compare, with (0.1g) Bi of equivalent 2WO 6/ TiO 2The Bi of fiber cloth, pure hot method preparation 2WO 6Nano particle, the Bi of solid phase reaction preparation 2WO 6/ TiO 2The TiO of powder and method of electrostatic spinning preparation 2Fiber cloth joins respectively in the aldehydes gas that 600mL concentration is 100ppm, and adsorption equilibrium 30 minutes places the 500W xenon lamp of the optical filter filtration of wavelength＞420nm to shine down then.Through 120 minutes Photocatalytic Activity for Degradation, the Bi of preparation 2WO 6/ TiO 2The fiber cloth degradation effect is obvious, and other three kinds of photocatalyst for degrading DeGrains.As a comparison, provided equal in quality Bi among Fig. 6 2WO 6/ TiO 2The Bi of fiber cloth, pure hot method preparation 2WO 6Nano particle, the Bi of solid phase reaction preparation 2WO 6/ TiO 2The TiO of powder and method of electrostatic spinning preparation 2Fiber cloth degraded situation under the same conditions.Through gas chromatographic measurement and calculating: the Bi of multistage heterogeneous structure 2WO 6/ TiO 2Fiber cloth produces CO 2Concentration is 195ppm, and efficient is several times of solid phase method under the similarity condition.Proved Bi with multistage heterogeneous structure 2WO 6/ TiO 2The visible light photocatalysis active that the fiber cloth photochemical catalyst is high.
Embodiment 2
Electrostatic spinning TiO 2Precursor sol is that 8% polyvinylpyrrolidone (PVP), 10% acetic acid, 10% butyl titanate and the ethanol of surplus are formed by mass concentration, and it is mixed.At room temperature, above-mentioned presoma is joined in the electrospinning device, make presoma in injection apparatus with TiO 2The form ejection of nano wire obtains TiO on receiving system 2The fiber cloth that the presoma nano wire is formed.The TiO that obtains 2Precursor fibre cloth obtains TiO 500 ℃ of sintering 2 hours 2Fiber cloth.
Alcohol thermal synthesis Bi 2WO 6Presoma is 0.796g bismuth citrate (analyzing pure) and the 0.329g Na that 0.025M forms by stoichiometric proportion by molar concentration 2WO 42H 2O (analyzing pure) is dissolved in and forms in the 40mL glycerine.With Bi 2WO 6Presoma and nano-TiO 2Fiber cloth joins in the pure hot still, wherein Bi 2WO 6Presoma and nano-TiO 2The mass ratio of fiber cloth is 100: 1, will still put into baking oven after the sealing, 110 ℃ of alcohol heat of temperature 18 hours, makes Bi 2WO 6Nano particle forms nanometer sheet, and further growth is at TiO 2On the fiber cloth, form the Bi of multistage heterogeneous structure 2WO 6/ TiO 2Fiber cloth.
Through the XRD constituent analysis, obtained Bi 2WO 6With TiO 2Compound nano-fiber cloth.Through electron microscopic observation, fiber cloth is that the length of side that is prepared by the hot method of alcohol is that 180nm, thickness are the Bi of 35nm 2WO 6The diameter that interweaves in order mutually that nanometer sheet tilts to be grown in the method for electrostatic spinning preparation is the TiO of 400nm 2On the fiber, Bi wherein 2WO 6Nanometer sheet is again by the Bi that is of a size of 35nm 2WO 6Nano particle is formed.The visible light degrade acetaldehyde of wavelength＞420nm is produced CO 2Experimental result is lower than embodiment 1, CO 2Concentration is 167ppm.
Embodiment 3
The TiO of electrostatic spinning preparation 2The preparation method of fiber cloth is with embodiment 1.
Alcohol thermal synthesis Bi 2WO 6Presoma is 0.323g bismuth oxalate (analyzing pure) and the 0.066g Na that 0.005M forms by stoichiometric proportion by molar concentration 2WO 42H 2O (analyzing pure) is dissolved in and forms in the 40mL ethylene glycol.With Bi 2WO 6Presoma and nano-TiO 2Fiber cloth joins in the pure hot still, wherein Bi 2WO 6Presoma and nano-TiO 2The mass ratio of fiber cloth is 1200: 1, will still put into baking oven after the sealing, 160 ℃ of alcohol heat of temperature 16 hours, makes Bi 2WO 6Nano particle forms nanometer sheet, and further growth is at TiO 2On the fiber cloth, form the Bi of multistage heterogeneous structure 2WO 6/ TiO 2Fiber cloth.
Through the XRD constituent analysis, obtained Bi 2WO 6With TiO 2Compound nano-fiber cloth.Through electron microscopic observation, fiber cloth is that the length of side that is prepared by the hot method of alcohol is that 70nm, thickness are the Bi of 15nm 2WO 6The diameter that interweaves in order mutually that nanometer sheet tilts to be grown in the method for electrostatic spinning preparation is the TiO of 200nm 2On the fiber, Bi wherein 2WO 6Nanometer sheet is again by the Bi that is of a size of 15nm 2WO 6Nano particle is formed.The visible light degrade acetaldehyde of wavelength＞420nm is produced CO 2Experimental result is lower than embodiment 1, CO 2Concentration is 142ppm.
Embodiment 4
The TiO of electrostatic spinning preparation 2The preparation method of fiber cloth is with embodiment 2.
Alcohol thermal synthesis Bi 2WO 6Presoma is 0.772g bismuth acetate (analyzing pure) and the 0.329g Na that 0.025M forms by stoichiometric proportion by molar concentration 2WO 42H 2O (analyzing pure) is dissolved in and forms in the 40mL ethanol.With Bi 2WO 6Presoma and nano-TiO 2Fiber cloth joins in the pure hot still, wherein Bi 2WO 6Presoma and nano-TiO 2The mass ratio of fiber cloth is 500: 1, will still put into baking oven after the sealing, 160 ℃ of alcohol heat of temperature 15 hours, makes Bi 2WO 6Nano particle forms nanometer sheet, and further growth is at TiO 2On the fiber cloth, form the Bi of multistage heterogeneous structure 2WO 6/ TiO 2Fiber cloth.
Through the XRD constituent analysis, obtained Bi 2WO 6With TiO 2Compound nano-fiber cloth.Through electron microscopic observation, fiber cloth is that the length of side that is prepared by the hot method of alcohol is that 200nm, thickness are the Bi of 45nm 2WO 6The diameter that interweaves in order mutually that nanometer sheet tilts to be grown in the method for electrostatic spinning preparation is the TiO of 400nm 2On the fiber, Bi wherein 2WO 6Nanometer sheet is again by the Bi that is of a size of 45nm 2WO 6Nano particle is formed.The visible light degrade acetaldehyde of wavelength＞420nm is produced CO 2Experimental result is lower than embodiment 1, CO 2Concentration is 118ppm.
Embodiment 5
Electrostatic spinning is that 10% polyvinylpyrrolidone (PVP), 10% zinc acetate, 30% deionized water and the ethanol of surplus are formed with the ZnO precursor sol by mass concentration, and it is mixed.At room temperature, above-mentioned presoma is joined in the electrospinning device, make presoma form ejection with the ZnO nano wire in injection apparatus, on receiving system, obtain the fine accurate cloth that ZnO presoma nano wire is formed.The ZnO precursor fibre cloth that obtains 500 ℃ of sintering 4 hours, is obtained the ZnO fiber cloth.
Alcohol thermal synthesis Bi 2WO 6Presoma is the 0.485g Bi (NO that 0.0125M forms by stoichiometric proportion by molar concentration 3) 35H 2O (analyzing pure) and 0.165g Na 2WO 42H 2O (analyzing pure) is dissolved in and forms in the 40mL ethylene glycol.With Bi 2WO 6Presoma and nano-ZnO fiber cloth join in the pure hot still, wherein Bi 2WO 6The mass ratio of presoma and nano-ZnO fiber cloth is 800: 1, will still put into baking oven after the sealing, 160 ℃ of alcohol heat of temperature 12 hours, makes Bi 2WO 6Nano particle forms nanometer sheet, and further growth forms the Bi of multistage heterogeneous structure on the ZnO fiber cloth 2WO 6/ ZnO fiber cloth.
Through the XRD constituent analysis, obtained Bi 2WO 6The nano-fiber cloth compound with ZnO.Through electron microscopic observation, fiber cloth is that the length of side that is prepared by the hot method of alcohol is that 200nm, thickness are the Bi of 45nm 2WO 6The diameter that interweaves in order mutually that nanometer sheet tilts to be grown in the method for electrostatic spinning preparation is on the ZnO fiber of 200nm, wherein Bi 2WO 6Nanometer sheet is again by the Bi that is of a size of 45nm 2WO 6Nano particle is formed.The visible light degrade acetaldehyde of wavelength＞420nm is produced CO 2Experimental result is lower than embodiment 1, CO 2Concentration is 137ppm.

Claims (9)

1, a kind of Bi with multistage heterogeneous structure 2WO 6/ oxidate nano fiber cloth is characterized in that described nano-fiber cloth with multistage heterogeneous structure is the Bi by the hot method preparation of alcohol 2WO 6Nanometer sheet tilts to be grown in the TiO that interweaves in order mutually of method of electrostatic spinning preparation 2Or on the ZnO fiber, Bi wherein 2WO 6Nanometer sheet is by Bi 2WO 6Nano particle is formed.
2, the Bi with multistage heterogeneous structure according to claim 1 2WO 6/ oxidate nano fiber cloth is characterized in that described Bi 2WO 6The nanometer sheet length of side is that 50～200nm, thickness are 10～40nm.
3, the Bi with multistage heterogeneous structure according to claim 1 2WO 6/ oxidate nano fiber cloth is characterized in that the described TiO that interweaves in order mutually 2Or the diameter of ZnO fiber is 100～500nm.
4, the Bi with multistage heterogeneous structure according to claim 1 2WO 6/ oxidate nano fiber cloth is characterized in that described Bi 2WO 6Nanoparticle size is 10～40nm.
5, preparation is according to each described Bi with multistage heterogeneous structure of claim 1～4 2WO 6The method of/oxidate nano fiber cloth is characterized in that Bi 2WO 6/ TiO 2The preparation process of nano-fiber cloth is:
(a) preparation TiO 2Precursor sol
Described electrostatic spinning TiO 2Precursor sol is that 2～10% polyvinylpyrrolidone, 11～22% acetic acid, 5～45% butyl titanate and surplus ethanol are formed, and it is mixed by mass percentage concentration;
(b) prepare nano-TiO under the electrostatic spinning condition 2Fiber cloth
At room temperature, the precursor sol of step a preparation is joined in the electrospinning device, make presoma in injection apparatus with TiO 2The form ejection of nano wire obtains TiO on receiving system 2The fiber cloth that the presoma nano wire is formed is then with the TiO that obtains 2Precursor fibre cloth obtains TiO 500 ℃ of sintering 2 hours 2Fiber cloth;
(c) preparation Bi 2WO 6Presoma
Alcohol thermal synthesis Bi 2WO 6Presoma be to be that 0.0025M～0.025M is by Bi by molar concentration 2WO 6The stoichiometric proportion salt that contains bismuth ion and tungsten ion formed, and alcohol is formed as solvent;
(d) Bi of multistage heterogeneous structure under the pure heat condition 2WO 6/ TiO 2The preparation of fiber cloth
Bi with step c preparation 2WO 6The nano-TiO of presoma and step b preparation 2Fiber cloth joins in the pure hot still container, wherein Bi 2WO 6Presoma and nano-TiO 2The mass ratio of fiber cloth is 2000: 1～40: 1, will put into baking oven after the seal of vessel, in 100～200 ℃ of pure thermal responses of temperature, makes Bi 2WO 6Nano particle forms nanometer sheet, and further growth is at TiO 2On the fiber cloth, form multistage heterogeneous structure.
6, the Bi with multistage heterogeneous structure according to claim 5 2WO 6The preparation method of/oxidate nano fiber cloth is characterized in that the described salt that contains bismuth ion of step c is nitrate, oxalates or citrate; The salt of described tungstenic is sodium salt or ammonium salt etc.; Described alcohol is ethanol, ethylene glycol or glycerine.
7, the Bi with multistage heterogeneous structure according to claim 5 2WO 6The preparation method of/oxidate nano fiber cloth is characterized in that the time of steps d alcohol thermal response is 5～24 hours.
8, the described Bi of claim 1 with multistage heterogeneous structure 2WO 6The application of/oxide is characterized in that being applied in aspects such as solar cell, photocatalysis, automatically cleaning.At organic pollutant degradation, indoor-outdoor air purification, treating vehicle exhaust, photochemical catalyzing or antibiosis.
9, by the described Bi of claim 8 with multistage heterogeneous structure 2WO 6The application of/oxide is characterized in that being better than not having in organic matter acetaldehyde degraded the TiO of heterojunction structure 2Fiber cloth, pure Bi 2WO 6Nano particle, be a kind of effective visible-light photocatalyst.
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