Method for preparing ultravoilet catalytic degraded plastic using titanium dioxide as catalyst
A technology for degrading plastics and titanium dioxide, which is applied in the field of chemistry and chemical engineering, can solve the problems that plastics cannot be completely degraded, and achieve the effects of low cost, simple preparation process and low price
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Embodiment 1
[0013] 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.
[0014] 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
[0016] TiO 2 The preparation of nanopowder is as in Example 1.
[0017] Dissolve 12.0g of polyethylene plastic in 40ml of tetrahydrofuran, then add 0.07g of TiO 2 Nano powder. Stir for 90min 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 polyethylene plastic. Using ultraviolet light as the light source, the weight, molecular weight and secondary pollution of photocatalytically degradable polyethylene plastics and pure polyethylene plastics were compared with light time. Studies have shown that after pure polyethylene plastic is exposed to ultraviolet light for 100 hours, the weight and molecular weight reduction values caused by direct photolysis are 7.2% and 71.8%, respectively. However, the photocatalytically degraded polyethylene plastic prepared by this method, due to TiO 2 After 100 hours of ultraviolet ...
Embodiment 3
[0019] TiO 2 The preparation of nanopowder is as in Example 1.
[0020] 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...
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