【摘要】 采用溶胶–凝胶法制备TiO2光催化剂以及掺杂Fe3+和Ce3+的TiO2光催化剂,进行间歇式光催化降解气相苯动力学实验,基于光催化Langmuir-Hinshelwood反应动力学模型(L-H模型),测定气相苯在3种光催化剂上的降解动力学常数和吸附平衡常数。根据光催化降解气相苯实验动力学曲线和L-H模型,估算出TiO2、Fe3+/TiO2和Ce3+/TiO2光催化剂光催化降解苯的反应速率常数k和Langmuir吸附常数K分别为0.5247g/m3·min、1.523g/m3·min、1.010g/m3·min和8.605×10-2m3/g、2.390×10-2m3/g、3.928×10-2m3/g。掺杂Fe3+和Ce3+可明显提高光催化剂光催化降解苯的反应速率常数k,其中Fe3+/TiO2的反应速率常数k最大。更多还原

【Abstract】 In this work, TiO2, Fe3+/TiO2 and Ce3+/TiO2 photocatalysts were prepared. Kinetic research of photocatalytic degradation of benzene were carried out on these photocatalysts. The adsorption equilibrium constants and the photocatalytic reaction rate constants of gaseous benzene on the photocatalysts were calculated on the basis of Langmuir-Hinshelwood model and the experiments of photocatalytic degradation. Results indicate that the photocatalytic reaction constant k of gaseous benzene on the TiO2, Fe3+/TiO2 and Ce3+/TiO2 are 0.5247g/m3·min, 1.523g/m3·min and 1.010g/m3·min respectively. Langmuir adsorption constant K are 8.605×10-2m3/g, 2.390×10-2m3/g, 3.928×10-2m3/g respectively on the TiO2, Fe3+/TiO2 and Ce3+/TiO2 photocatalysts. The photocatalyst respectively doped with Ce3+or Fe3+ have higher photocatalytic reaction constants k in comparison with TiO2 photocatalyst, the Fe3+/TiO2 photocatalyst was the best.更多还原