摘要
讨论了O2/C3H8摩尔比在2-9范围内时，火焰温度对TiO2晶型的影响，O2/C3H8摩尔比和火焰中TiO2颗粒浓度对含碳纳米TiO2碳含量的影响。用管式光催化反应器，以液相沉积法将TiO2薄膜涂敷到反应器石英玻璃管内壁，实验测量了光催化降解甲醛气体的降解率。用4阶龙格-库塔法求解传质方程，得到了一级速率常数。经讨论得出：当含碳量约为5％时，降解率达最大值，是无碳或碳含量大于10％的TiO2的2．5倍。
Synthesis and characterization of carbon containing TiO2 nanoparticles by industrial propane/air flame CVD process have been reported under the mole ratio of propane to air in the range of 2 to 9. Effects of flame temperature on rutile mass fraction, and effects of mole ratio of propane to air and number density of TiOz nanoparticles in the flame on carbon mass fraction have been discussed. Photodegradation of formaldehyde by the carbon containing TiO2 nanoparticles has been investigated by using a tubular photoreactor with thin TiO2 film coated on the wall of the tubular reactor by sedimentation method. Apparent 1st order rate constant has been obtained by numerical integration of mass transfer equation with measured degradation degree. Effects of carbon content and rutile mass fraction of the TiO2 nanoparticles have been examined on the Ist order rate constant and results showed that degradation degree gets a maximum at the carbon content of about 5% by weight and is about 2.5 times of that at carbon content about zero or above 10%.
基金
大连理工大学材料学科基金资助
