Continuous poriferous titanium dioxide fiber and the technique of preparing the same

A technology of porous titanium dioxide and preparation process, applied in titanium dioxide, titanium oxide/hydroxide, chemical instruments and methods, etc., can solve the problems of TiO2 shedding, reduction of photocatalytic efficiency and activity, reduction of catalyst specific surface area, etc., and achieve production costs. Low cost, saving the cost of sewage degradation treatment, and easy to industrialize the effect of production

Inactive Publication Date: 2007-09-26
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that the specific surface area of ​​the catalyst is greatly reduced, and the supported TiO 2 It is easy to fall off from the carrier, which seriously reduces its photocatalytic efficiency and activity
Another method is to prepare TiO 2 fibers, but currently domestically prepared fibers are micron-sized, and in wastewater treatment, there are still 2 Defects that are difficult to separate like powder

Method used

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  • Continuous poriferous titanium dioxide fiber and the technique of preparing the same
  • Continuous poriferous titanium dioxide fiber and the technique of preparing the same
  • Continuous poriferous titanium dioxide fiber and the technique of preparing the same

Examples

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Effect test

Embodiment 1

[0045] Example 1: Using the sol-gel method, 60g of butyl titanate with a purity of 99.0%, 3g of diethanolamine and 10g of absolute ethanol were mixed, then added to a three-necked flask, and stirred evenly with a GS122 electronic constant speed stirrer. Mix 20 g of absolute ethanol with 4 g of distilled water, and then slowly drop them into the three-necked flask through a separatory funnel. Butyl titanate forms low molecular weight TiO through hydrolysis and condensation reactions 2 Sol, while heating it to 200° C., and adding 2 g and 8 g each of polyethylene glycol and polyethylene; keep the temperature and evaporate for 3 hours. Then put it into the spinning barrel and spin under pressure at 200 °C, while the temperature of the vacuum oven is kept at 300 °C to obtain continuous porous TiO 2 fiber. Then it is heat-treated at 500° C. for 2 hours, and its crystal form is anatase, and the size of nano particles is 30-50 nm. The fiber length reaches 2m, and the specific surfa...

Embodiment 2

[0046] Example 2: Using the sol-gel method, 60 g of butyl titanate with a purity of 99.0%, 3 g of diethanolamine and 10 g of absolute ethanol were mixed, then added to a three-necked flask, and stirred evenly with a GS122 electronic constant speed stirrer. Mix 20 g of absolute ethanol with 4 g of distilled water, and then slowly drop them into the three-necked flask through a separatory funnel. Butyl titanate forms low molecular weight TiO through hydrolysis and condensation reactions 2 sol, while heating it to 225°C, and adding 3 g and 7 g of polyethylene glycol and polyethylene respectively, keeping the temperature and evaporating for 3 hours. Then put it into the spinning barrel and spin under pressure at 250 °C, while the temperature of the vacuum oven is kept at 300 °C to obtain continuous porous TiO 2 fiber. Then it is heat-treated at 500° C. for 2 hours, and its crystal form is anatase, and the size of nano particles is 30-50 nm. Its length reaches 3.5m and its speci...

Embodiment 3

[0047] Example 3: Using the sol-gel method, 60 g of butyl titanate with a purity of 99.0%, 3 g of diethanolamine and 10 g of absolute ethanol were mixed, then added to a three-necked flask, and stirred evenly with a GS122 electronic constant speed stirrer. Mix 20 g of absolute ethanol with 4 g of distilled water, and then slowly drop them into the three-necked flask through a separatory funnel. Butyl titanate forms low molecular weight TiO through hydrolysis and condensation reactions 2 sol, while heating it to 225°C, and adding 3 g and 7 g of polyethylene glycol and polyethylene respectively, keeping the temperature and evaporating for 3 hours. Then put it into the spinning barrel and spin under pressure at 225 °C, while the temperature of the vacuum oven is kept at 400 °C to obtain continuous porous TiO 2 fiber. Then it is heat-treated at 500° C. for 2 hours, and its crystal form is anatase, and the size of nano particles is 30-50 nm. Fiber length up to 10m, specific surf...

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Abstract

The invention relates to a continuous porous titanium dioxide fiber and the preparing technology. Sol-gel method is used to prepare the continuous porous titanium oxide fiber. First, TiO2 sol with low molecular weight is compounded; by evaporating organic solvent and adding polymer, TiO2 fiber precursor with high molecular weight is prepared. Then by extruding and extending the continuous porous TiO2 fiber is compounded. The outstanding characteristic of method is that by using sol-gel method the continuous porous TiO2 fiber with new structure and good physical and chemical property is prepared so as to provide a new path for studying continuous inorganic fiber material. At the same time, the technology is simple and it is easy to industrial production. It makes active contribution to developing theory, technology and method of sol-gel filature.

Description

technical field [0001] The invention relates to a continuous porous titanium dioxide fiber and a preparation process thereof, belonging to the field of functional materials. Background technique [0002] TiO 2 Because of its biological and chemical inertness, no photocorrosion and chemical corrosion, and low price, it has been proved to be the most widely used photocatalyst. Due to TiO 2 The electron distribution of is characterized by the presence of a band gap between its conduction and valence bands. When illuminated, as long as the energy of the photon is equal to or exceeds the band gap energy of the semiconductor (hv≥E g ), the electrons can transition from the valence band to the conduction band, thereby generating conduction band electrons and valence band holes. Under the action of the electric field of the space charge layer, the free electrons in the conduction band quickly migrate to the surface of the semiconductor particles and transfer to the oxidized comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/06C01G23/053
Inventor 张世英李佑稷余取民匡加才
Owner CHANGSHA UNIVERSITY
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