TiO2/SiO2纳米粒子光催化降解庚烯/二氧化硫

以TiO₂/SiO₂纳米粒子为催化剂， 研究了催化剂不同焙烧温度对二氧化硫与庚烯光催化反应的影响. 结果表明， 经600 ℃焙烧的催化剂对庚烯的降解最好. 同时研究了庚烯和二氧化硫的初始浓度、 氧气和水蒸气的不同含量及光强等因素对其光催化氧化降解的影响. 庚烯的降解速率随着二氧化硫浓度的增加而增加， 最终趋于稳定. 在二氧化硫浓度一定时， 庚烯的反应速率分别随着氧气和水分子含量的增加而不断增大， 氧含量为20%时速率最大； 水分子含量为444 μmol/L时速率最大. 庚烯的反应速率随着光强的增加而增大， 光强增至8.32 mW/cm²时， 反应速率趋于定值. 通过FT-IR和GC-MS测定初步确定了反应产物.

Photocatalytic Degradation of Heptene/sulfur Dioxide in Gas-phase by Nano-TiO2/SiO2

Nano-TiO₂/SiO₂ was used as catalyst to investigate the influence of different calcined temperatures on the photocatalytic activity of the catalyst for the photocatalytic degradation of heptene. The photocatalytic activity of the catalyst is the highest when the calcination temperature is 600 ℃. The photocatalytic degradation rate of heptene increased with increasing the initial concentration of sulfur dioxide, but maintained almost a constant beyond a certain concentration. When the concentration of sulfur dioxide was fixed, the reaction rate increased separately with increasing oxygen content and water vapor content, when oxygen content was 20%, the reaction rate was the highest, while water vapor content was 444 μmol/L, there was an optimum value for the photocatalytic degradation rate of heptene. The degradation rate of heptene increased with light intensity but the rate approached to level off when the light intensity rose to 8.32 mW/cm². The reaction products were identified by FT-IR and GC-MS.