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Method for preparing ultraviolet catalytic degraded plastic using titanium dioxide as catalyst

A technology for degrading plastics and titanium dioxide, applied in the field of chemistry and chemical industry, can solve the problems of inability to completely degrade plastics, and achieve the effects of low cost, fast degradation rate and total reduction

Inactive Publication Date: 2004-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two photodegradation reactions only serve the purpose of decomposing plastics to a certain extent, and cannot completely degrade plastics.
And in actual use, there is a problem of how to choose a highly active, stable, low-cost chromophore and photosensitizer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] TiO 2 Nano powder: mix 99ml of TiCl at room temperature 4 The solution was slowly added dropwise to 350ml of 95% C 2 h 5 OH, stirring while adding dropwise. After 15 minutes of ultrasonic oscillation, a uniform and transparent light yellow solution was obtained. The solution was left to stand in a closed environment for 3 days. Add 300ml of 95% C to the solution dropwise 2 h 5 OH, stand still in a closed environment for gelation reaction, and a transparent sol with a certain viscosity can be obtained. The sol is heat-treated at 80°C, and the solvent can be removed to form a pale yellow xerogel. Pre-body xerogels were heat-treated at 400°C for 3 hours to form TiO 2 Nano powder.

[0013] Preparation of photocatalytically degradable plastics: Dissolve 0.5g of polystyrene plastic in 10ml of tetrahydrofuran, and then add 0.01g of TiO 2 Nano powder. Stir for 60min to make TiO 2 Spread evenly in the solution. The solution of about 10ml was evenly dropped on the po...

Embodiment 2

[0015] TiO 2 The preparation of nanopowder is as in Example 1.

[0016] Dissolve 5g of polyvinyl chloride plastic in 75ml of tetrahydrofuran, then add 0.25g of TiO 2 Nano powder. Stir for 60min to make TiO 2 Spread evenly in the solution. Take about 10ml of this solution, drop evenly on the polytetrafluoroethylene plate, and peel it off after natural air drying to obtain photocatalytically degradable polyvinyl chloride plastic. Using ultraviolet light as the light source, the weight, molecular weight and secondary pollution of photocatalytically degradable polyvinyl chloride plastics and pure polyvinyl chloride plastics were compared with light time. Studies have shown that after pure polyvinyl chloride plastic is exposed to ultraviolet light for 200 hours, the weight and molecular weight reduction values ​​caused by direct photolysis are 3.0% and 54.8%, respectively. However, the photocatalytic degradation of polyvinyl chloride plastics prepared by this method, due to Ti...

Embodiment 3

[0018] TiO 2 The preparation of nanopowder is as in Example 1.

[0019] Dissolve 4.0g of polyvinyl chloride plastic in 60ml of tetrahydrofuran, then add 0.1g of TiO 2 Nano powder. Stir for 30min to make TiO 2 Spread evenly in the solution. The solution was evenly dropped on the polytetrafluoroethylene plate, and then peeled off after natural air drying to obtain photocatalytically degradable polyvinyl chloride plastic. Also using ultraviolet light as the light source, the weight, molecular weight and secondary pollution of photocatalytically degradable polyvinyl chloride plastics and pure polyvinyl chloride plastics were compared with light time. Studies have shown that after pure polyvinyl chloride plastic is exposed to ultraviolet light for 80 hours, the weight and molecular weight reduction values ​​caused by direct photolysis are 2.1% and 45.8%, respectively. However, the photocatalytic degradation of polyvinyl chloride plastics prepared by this method, due to TiO 2 ...

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Abstract

The invention is a method for ultraviolet catalyzer degraded plastic which uses titanium dioxide as catalyzer, TiO2 nano powder and plastic are blended and dissolved in four hydrogen furan and produced into liquid, the liquid is dropped onto poly-lene fluorin ethylene board it is taken off after it is dried naturally, and then the ultraviolet catalyzer degraded plastic is obtained.

Description

technical field [0001] The present invention relates to a kind of utilization TiO 2 The invention relates to a photocatalyst, a method for preparing a photocatalytically degradable plastic under ultraviolet light, and belongs to the field of chemical engineering. Background technique [0002] The extensive use of plastic products has brought great convenience to consumers and improved people's health and quality of life, but it has also caused great pollution to the environment. The main ways to solve this problem are: landfill method, incineration method, and recycling and reuse. The first two methods are both laborious and costly and cause secondary pollution, but recycling management alone has been proven to be infeasible. To completely solve the pollution of plastic packaging and other wastes, from the research direction, the fundamental way should be to synthesize degradable plastics (including photodegradable plastics, biodegradable plastics and photo / biological doubl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08K3/22C08L23/00C08L23/06C08L25/00C08L25/06C08L27/06
Inventor 朱永法尚静
Owner TSINGHUA UNIV