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Preparation method of nano fiber containing TiO2/WO3 heterojunction

A technology of nanofibers and heterojunctions, applied in fiber processing, fiber chemical characteristics, chemical instruments and methods, etc., can solve problems such as limiting sunlight utilization and affecting TiO2 photocatalytic efficiency, so as to improve catalytic ability and facilitate experimental conditions Controlled, topographical effects

Inactive Publication Date: 2014-07-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 Bandgap width E g Large, which requires higher energy (ultraviolet light) to excite, and ultraviolet light only accounts for 3~4% of sunlight, which greatly limits the use of sunlight
At the same time due to TiO 2 The electrons and holes generated under the excitation of ultraviolet light are very easy to recombine inside before reaching the catalyst surface, thus affecting the TiO 2 photocatalytic efficiency

Method used

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  • Preparation method of nano fiber containing TiO2/WO3 heterojunction
  • Preparation method of nano fiber containing TiO2/WO3 heterojunction
  • Preparation method of nano fiber containing TiO2/WO3 heterojunction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Inorganic TiO 2 Preparation of nanofibers and WO 3 Sol preparation

[0033] Weigh 1.50g of PVP into a beaker, add 14mL of absolute ethanol and 3mL of glacial acetic acid to it, and stir magnetically for 4 hours; slowly add 4ml of tetrabutyl titanate to the above solution dropwise under stirring, and continue magnetically stirring 4h, the spinning solution of titanium dioxide was obtained. Electrospinning the spinning liquid, setting the voltage at 13,000 volts, the propulsion rate of the spinning liquid in the needle tube is 30 μL / min, and the distance between the spinneret and the receiving device is 10 cm, and TiO 2 / PVP non-woven fabric. The obtained non-woven fabric is calcined at 500°C to obtain inorganic TiO 2 Nanofibers.

[0034] Add 25ml H to 2g tungstic acid powder 2 o 2 , heated at 90°C, and magnetically stirred for 4 hours, the tungstic acid powder was dissolved. Add 60ml H to it 2 O, stirred to obtain colorless and transparent WO 3 Sol.

[003...

Embodiment 2

[0041] (1) Inorganic TiO 2 Preparation of nanofibers and WO 3 Sol preparation

[0042] Weigh 1.40g of PVP into a beaker, add 13mL of absolute ethanol and 4mL of glacial acetic acid to it, and stir magnetically for 2 hours; slowly add 3.5ml of isopropyl titanate into the above solution under stirring, and continue to magnetically Stir for 4 hours to obtain a spinning solution of titanium dioxide. Electrospinning the spinning liquid, setting the voltage at 15,000 volts, the propulsion rate of the spinning liquid in the needle tube is 20 μL / min, and the distance between the spinneret and the receiving device is 8 cm, and TiO 2 / PVP non-woven fabric. The obtained non-woven fabric is calcined at 450°C to obtain inorganic TiO 2 Nanofibers.

[0043] (2) Add 24ml H to 2g tungstic acid powder 2 o 2 , heated at 80°C, and magnetically stirred for 4 hours, the tungstic acid powder was dissolved. Add 50ml H to it 2 O, stirred to obtain colorless and transparent WO 3 Sol.

[0044...

Embodiment 3

[0050] (1) Inorganic TiO 2 Preparation of nanofibers and WO 3 Sol preparation

[0051] Weigh 1.30g of PVP into a beaker, add 14mL of absolute ethanol and 3mL of glacial acetic acid to it, and stir magnetically for 4 hours; slowly add 4ml of tetrabutyl titanate to the above solution under stirring, and continue magnetic stirring 4h, the spinning solution of titanium dioxide was obtained. Electrospinning the spinning liquid, setting the voltage at 13,000 volts, the propulsion rate of the spinning liquid in the needle tube is 20 μL / min, and the distance between the spinneret and the receiving device is 10 cm, and TiO 2 / PVP non-woven fabric. The obtained non-woven fabric is calcined at 550°C to obtain inorganic TiO 2 Nanofibers.

[0052] (2) Add 25ml H to 2g tungstic acid powder 2 o 2 , heated at 90°C, and magnetically stirred for 4 hours, the tungstic acid powder was dissolved. Add 60ml H to it 2 O, stirred to obtain colorless and transparent WO 3 Sol.

[0053] (3) Co...

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Abstract

The invention relates to a preparation method of a nano fiber containing TiO2 / WO3 heterojunction. The preparation method comprises the following steps of (1) adding soluble titanium salt into a mixed solvent of PVP (Poly Vinyl Pyrrolidone), absolute ethyl alcohol and acetic acid, and obtaining inorganic TiO2 nano fiber by adopting an electrostatic spinning and calcining method; and sequentially adding H2O2 and H2O in tungstic acid powder, and obtaining colorless and transparent WO3 sol; (2) preparing TiO2 nano fiber containing WO3 seed crystal by adding the TiO2 nano fiber into the WO3 sol; and (3) adding the WO3 sol, HMT (Hexamethylenetetramine) and water into the TiO2 nano fiber containing the WO3 seed crystal, and keeping warm for 6-12 hours under 120-180 DEG C; and drying a product which is obtained after hydrothermal in low temperature after centrifuging and water washing, and thus obtaining the nano fiber containing the TiO2 / WO3 heterojunction can be obtained. The preparation method disclosed by the invention is simple and practical, the composition of the TiO2 and the WO3 is more uniform and fuller, a large amount of contact interfaces can be formed, and the catalyzing ability can be increased.

Description

technical field [0001] The invention belongs to the field of preparation of nanofibers, in particular to a TiO-containing 2 / WO 3 Preparation method of heterojunction nanofibers. Background technique [0002] In recent years, titanium dioxide has been used more and more in the fields of photocatalytic degradation of pollutants, photolysis of water to produce hydrogen, and solar cells. Titanium dioxide is a broadband semiconductor material with a bandgap of 3.0eV (rutile phase) and 3.2eV (anatase phase). The bandgap E of the semiconductor g The larger is, the higher the oxidation-reduction electrode potential corresponding to the generated photo-generated electrons and holes is, the stronger the oxidation-reduction ability of the semiconductor is, and the easier it is to react with other substances. However, due to TiO 2 Bandgap width E g Large, which requires higher energy (ultraviolet light) to excite, and ultraviolet light only accounts for 3~4% of sunlight, which gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08D01F9/10D01F11/00D01D5/00B01J23/30B01J35/06
Inventor 张青红张利巩娜娟王宏志李耀刚
Owner DONGHUA UNIV
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