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Preparation method of TiO2 nano fibers with adjustable crystal phase

A technology of nanofibers and crystal phases, applied in the field of nanomaterials and photocatalysis, can solve the problems of increasing the cost and operation difficulty of electrospinning devices, difficult to solve titanium source hydrolysis, and hindering the spinning process, so as to improve spinnability and avoid Hydrolysis, low cost effect

Inactive Publication Date: 2015-07-01
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, literature (Dai, Y., Liu, W., Formo, E., Sun, Y. & Xia, Y. Ceramic nanofibers fabricated by electrospinning and their applications in catalysis, environmental science, and energy technology. Polym. Adv. Technol. 22, 326–338 (2011)) pointed out that in the spinning process, the hydrolysis of titanium source has always been a difficult problem to solve
In the above-mentioned prior art, after the configuration of the spinning solution is completed, hydrolyzate is often generated during the spinning process, which blocks the needle and hinders the spinning process.
According to the narration in the literature, the main countermeasures taken now are the control of humidity and atmosphere. When configuring the spinning solution and spinning, it is necessary to control it at low humidity or use an atmosphere control device to avoid contact between the spinning solution and the air. Regardless of the method, the cost and operational difficulty of the electrospinning device are greatly increased

Method used

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  • Preparation method of TiO2 nano fibers with adjustable crystal phase
  • Preparation method of TiO2 nano fibers with adjustable crystal phase
  • Preparation method of TiO2 nano fibers with adjustable crystal phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 0.45g of polyvinylpyrrolidone and dissolve it in 7mL of absolute ethanol, stir until completely dissolved to form a uniform and transparent solution, add 2 mL of glacial acetic acid dropwise to the solution, stir well, and then add 1mL of isopropyl titanate , after completely stirring to form a light yellow liquid, add 240 μL of deionized water dropwise within 1 minute, and stir for 30 minutes to completely hydrolyze the isopropyl titanate to form a uniform and transparent light yellow clear spinning solution;

[0034](2) Draw the spinning solution prepared in step (1) into the syringe for spinning. The diameter of the needle of the syringe is 0.8mm, the temperature and humidity in the room are 29°C and 12%, respectively, and the distance between the needle and the receiver is adjusted to 15cm. The propulsion speed of the silk liquid is 1.44mL / h, the voltage of the electrospinning process is 17.5kV, and the as-spun TiO 2 Nanofibers;

[0035] (3) TiO obtained ...

Embodiment 2

[0038] (1) Weigh 0.57g of polyvinylpyrrolidone and dissolve it in 7mL of absolute ethanol, stir until completely dissolved to form a uniform and transparent solution, add 1mL of glacial acetic acid dropwise to the solution, stir well, then add 1mL of isopropyl titanate, After completely stirring and forming a light yellow liquid, add 180 μL of deionized water dropwise within 45 seconds, and stir for 60 minutes to completely hydrolyze the isopropyl titanate to form a uniform and transparent light yellow clear spinning solution;

[0039] (2) Draw the spinning solution prepared in step (1) into the syringe for spinning. The diameter of the syringe needle is 0.8mm, the temperature and humidity in the room are 20°C and 55% respectively, and the distance between the needle and the receiver is adjusted to 12cm. The propulsion speed of the silk liquid is 1.44mL / h, the voltage of the electrospinning process is 15kV, and the as-spun TiO 2 Nanofibers;

[0040] (3) TiO obtained in step (...

Embodiment 3

[0042] (1) Weigh 0.67g of polyvinylpyrrolidone and dissolve it in 7mL of absolute ethanol, stir until completely dissolved to form a uniform and transparent solution, add 2.5mL of glacial acetic acid dropwise to the solution, stir well, and then add 1mL of isopropyl titanate , after completely stirring to form a light yellow liquid, add 240 μL of deionized water dropwise within 1 min, and stir for 30 min to completely hydrolyze the isopropyl titanate to form a uniform and transparent light yellow clear spinning solution;

[0043] (2) Draw the spinning solution prepared in step (1) into the syringe for spinning. The diameter of the needle of the syringe is 0.8mm, the temperature and humidity in the room are 24.3°C and 28% respectively, and the distance between the needle and the receiver is adjusted to 14cm. The propulsion speed of the silk liquid is 1.44mL / h, the voltage of the electrospinning process is 16kV, and the as-spun TiO 2 Nanofibers;

[0044] (3) TiO obtained in ste...

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Abstract

The invention relates to a preparation method of TiO2 nano fibers with an adjustable crystal phase. The preparation method comprises a titanium source prehydrolysis process, an electrostatic spinning process and a high-temperature calcining process. By virtue of prehydrolysis, the density of fibers is improved and the calcining determines the composition of the crystal phase of the fibers; and the prepared TiO2 nano fibers can be a pure rutile phase and also can be an anatase phase, or be a mixed phase of the pure rutile phase and the anatase phase. By virtue of the preparation method, the problem that a titanium source is extremely easy to hydrolyze under relatively high humidity is solved; and a prehydrolysis method is adopted so that the problem that the titanium source is hydrolyzed in the electrostatic spinning process, and a needle head is blocked is effectively avoided. The preparation method has a simple process, the requirements on environment conditions are reduced and the process is easy to control.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and photocatalysis, and relates to a crystal phase adjustable TiO 2 Preparation methods of nanofibers. Background technique [0002] Titanium dioxide (TiO 2 ) There are two crystal forms of rutile and perovskite, anatase TiO 2 It is a semiconductor material with excellent photocatalytic properties, stable performance, low price, safe and harmless to human body and environment, and chemical corrosion resistance. TiO 2 It is often regarded as the benchmark substance of photocatalysis. In addition to the field of photocatalysis, TiO 2 It is also widely used in solar cells, sensors, optoelectronic devices, drug loads and other fields. For rutile TiO 2 It can be used as solar light anti-reflection material, so the control of crystal phase is very important for TiO 2 Materials matter. Furthermore, TiO as a photocatalyst 2 If it exists in the form of nanoparticles, although it has good ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10D01D5/00D01D10/02
Inventor 杨萍聂世杰
Owner UNIV OF JINAN
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