【摘要】 为进一步提高环境空气中烷烃的光催化氧化实验的教学效果,本文以正庚烷(n-C₇H₁₆)为目标污染物,通过改进光催化氧化实验装置,并优化催化剂二氧化钛（TiO₂）的用量,确定催化时间,研究了TiO₂对环境空气中n-C₇H₁₆的光催化氧化效果.结果表明:改进装置后,TiO₂用量为0.50 g时,反应30 min可使n-C7H16的降解率达96.66%,光催化反应过程符合一级反应动力学模型.与改进前相比,实验改进后的教学效率提升显著且教学成本降低,更加符合本科实验教学的要求和特点.更多还原

【Abstract】 To further improve the experimental teaching effect of the photocatalytic oxidation experiment of alkane in ambient air. In this study,the photocatalytic oxidation of n-C₇ H₁₆ in ambient air was studied by improving the experimental device,optimizing the amount of TiO₂ and confirming reaction time. The results indicated that the degradation rate of n-C₇ H₁₆ could reach 96.66% after 30 min when the amount of TiO₂ was 0.50 g,and the experimental results could be described by first-order reaction kinetic model well. Compared with that before improvement,the teaching efficiency of the improved experiment was significantly improved and the teaching cost was reduced,which was more in line with the requirements and characteristics of undergraduate experimental teaching.更多还原