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Preparation method of TiO2 nanorod/SiC composite fiber felt

A composite fiber felt and nanorod technology, which is applied in fiber treatment, chemical instruments and methods, heating/cooling fabrics, etc., can solve the problem of difficult regulation of TiO2 shape and size, fast recombination rate of photogenerated electrons and photogenerated holes, and difficulty in recycling and reuse issues, to achieve excellent photocatalytic performance, facilitate large-scale production, and great application potential

Active Publication Date: 2013-12-18
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But pure nano TiO 2 There are two problems in the application process: one is that the recombination rate of photogenerated electrons and photogenerated holes is fast, which reduces the degradation efficiency; the other is that it is difficult to recycle and reuse
However, the SiC matrix used is a large-scale material such as SiC bulk or foam ceramics, with a small specific surface area.
The reported preparation of TiO 2 The method of / SiC is mainly the sol-gel method or the calcination and oxidation of TiC / SiC prepared by carbothermal reduction. The preparation process is relatively complicated and the cost is high. For TiO 2 It is also difficult to control the shape and size of

Method used

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  • Preparation method of TiO2 nanorod/SiC composite fiber felt
  • Preparation method of TiO2 nanorod/SiC composite fiber felt
  • Preparation method of TiO2 nanorod/SiC composite fiber felt

Examples

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Embodiment 1

[0029] This embodiment includes the following steps:

[0030] (1) Preparation of spinning solution: select polycarbosilane with a softening point of 200~220°C, dissolve polycarbosilane in xylene, and disperse it by ultrasonic for 4 hours, and prepare a polycarbosilane solution with a concentration of 1.1g / ml , to obtain spinning solution;

[0031] (2) Electrospinning: use a syringe to absorb 2ml of the spinning solution prepared in step (1), use a needle with an inner diameter of 0.8mm, select a voltage of 15kV, a collection distance of 15cm and a feeding rate of 15μl / min, and the prepared The polycarbosilane fibrils are collected on an aluminum foil collecting flat plate to obtain a polycarbosilane fibril mat;

[0032] (3) Pre-oxidation: Put the polycarbosilane fibril mat collected in step (2) in a pre-oxidation furnace, in an air atmosphere, heat up to 200°C at 20°C / h, keep it warm for 2h, and cool to room temperature. Melted polycarbosilane fiber mat;

[0033] (4) High-t...

Embodiment 2

[0041] This embodiment includes the following steps:

[0042] (1) Preparation of spinning solution: select polycarbosilane with a softening point of 200~220°C, dissolve polycarbosilane in xylene, and disperse it by ultrasonic for 5 hours, and prepare a polycarbosilane solution with a concentration of 1.5g / ml , that is, the spinning solution;

[0043] (2) Electrospinning: use a syringe to absorb 2ml of the spinning solution prepared in step (1), use a needle with an inner diameter of 0.8mm, select a voltage of 20kV, a collection distance of 20cm, and a feeding rate of 15μl / min, and collect the fibers in On the aluminum foil collecting flat plate, obtain the polycarbosilane fibril felt;

[0044] (3) Pre-oxidation: Place the polycarbosilane fibril mat collected in step (2) in a pre-oxidation furnace, raise the temperature to 210°C at 20°C / h in an air atmosphere, keep it warm for 110min, and cool to room temperature to obtain different Melted polycarbosilane fiber mat;

[0045]...

Embodiment 3

[0053] This embodiment includes the following steps:

[0054] (1) Preparation of spinning solution: select polycarbosilane with a softening point of 200~220°C, dissolve polycarbosilane in xylene, and disperse it by ultrasonic for 4 hours, and prepare a polycarbosilane solution with a concentration of 1.2g / ml , to obtain spinning solution;

[0055] (2) Electrospinning: use a syringe to absorb 2ml of the spinning solution prepared in step (1), use a needle with an inner diameter of 0.8mm, select a voltage of 18kV, a collection distance of 20cm and a feeding rate of 20μl / min, and collect the fibers in On the aluminum foil collecting flat plate, obtain the polycarbosilane fibril felt;

[0056] (3) Pre-oxidation: Put the polycarbosilane fibrils collected in step (2) in a pre-oxidation furnace, heat up at 25°C / h in an air atmosphere, keep it at 210°C for 2 hours, cool to room temperature, and it will not melt Polycarbosilane fiber;

[0057] (4) High-temperature firing: place the ...

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Abstract

The invention discloses a preparation method of a TiO2 nanorod / SiC composite fiber felt. The preparation method comprises the steps of taking polycarbosilane and butyl titanate as raw materials, dissolving the polycarbosilane in certain amount into an organic solvent, preparing an SiC fiber felt through heating and stirring, ultrasonic oscillating and defoaming, electrostatic spinning, air pre-oxidizing and high-temperature firing, and preparing the TiO2 nanorod / SiC composite fiber felt through a hydro-thermal synthesis reaction. The preparation method disclosed by the invention has the following advantages that by adopting a method that electrostatic spinning and hydro-thermal synthesis are combined, a TiO2 nanorod array is uniformly grown on SiC fiber, and the shape and the size of a TiO2 nanorod are controllable; the specific surface area of prepared composite fiber is large, and the TiO2 nanorod / SiC composite fiber felt has a great application potential in fields of organic pollutant photocatalytic degradation and the like; the preparation process is simple, the condition is gentle, and industrialized production is convenient to realize.

Description

technical field [0001] The invention relates to a composite fiber mat and a preparation method thereof, in particular to a TiO with a three-dimensional branched structure 2 Nanorod / SiC composite fiber mat and preparation method thereof. Background technique [0002] With the improvement of people's quality of life, issues such as water quality and air pollution have received widespread attention. Due to factors such as building materials, industrial and domestic emissions, there are more than a thousand types of toxic and harmful gases in the air and living rooms. Among them, organic substances such as hydrocarbons, aldehydes, and benzene are one of the main causes of water quality and air pollution. These organic substances not only seriously pollute the ecological environment, but also greatly affect people's health and shorten people's life span. In order to protect the ecological environment and improve the quality of life, organic pollutants in sewage and air must be ...

Claims

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Application Information

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IPC IPC(8): D04H1/4326D04H1/728D06C7/04D06M11/46D06M11/34B01J27/224
Inventor 王应德王兵
Owner NAT UNIV OF DEFENSE TECH
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