【摘要】 以纳米TiO2/SiO2为光催化剂、C7H8(toluene)-SO2-O2-TiO2/SiO2为重点研究体系,研究了甲苯的初始浓度、氧气含量、水蒸气含量和光强对甲苯光催化降解的影响。结果发现,甲苯的初始反应速率随其初始浓度的增加而增大,并最终趋于稳定;随着含氧量增加而不断增大,体积分数为25%时达到最大,之后逐渐减小;水蒸气的体积分数为0.4%时,甲苯降解速率最大;光强增加,甲苯增大反应速率,3.0mW/cm2时反应速率趋于定值。体系中引入SO2促进了甲苯的初步降解,却抑制反应中间产物的进一步降解;同时甲苯的存在也抑制了SO2的降解。更多还原

【Abstract】 TiO2/SiO2 is employed as the representative semiconductor catalyst to investigate the effects of initial concentration of reactant,oxygen content,water vapor content and light intensity on the photocatalytic reaction.The reaction rate increases when increasing the initial concentration of toluene,maintained constant eventually,increases when increasing oxygen content,and then decreases after higher than 25%.When water vapor content is 0.4%,the reaction rate reaches its maximum level.The more is the light intensity,the more is the reaction rate.When reached 3.0 mW/cm2,the reaction rate is invariable.The degradation of toluene is promoted in the presence of SO2,but the degradation of intermediate products is inhibited.Meanwhile,the degradation of SO2 is also inhibited by the presence of toluene.更多还原