摘要
以TiO2/SiO2纳米粒子为催化剂,研究了甲苯的初始浓度、氧气和水蒸气含量及光强等对其光催化氧化降解的影响.甲苯初始反应速率随其初始浓度的增加而增大,最终趋于稳定.氧气含量增加,甲苯反应速率增大,氧气含量增至18%时,抑制反应速率增加.水分子含量对甲苯反应速率的影响也有最佳值0.2%(体积比).甲苯的反应速率随光强增加而增大,在3mW/cm2时,反应速率趋于定值.采用LangmuirHinshelwood动力学模型得到甲苯光催化降解的反应速率常数和吸附常数,并通过FIRT和GCMS初步确定了反应产物.
The photocatalytic oxidation of toluene over {TiO_2/SiO_2} in the gas-phase was investigated. The feasibility studies involved the effects of initial concentration of reactant, oxygen content, water vapor content and light intensity on the photocatalytic reaction. The photocatalytic degradation rate increased with increasing the initial concentration of toluene, but maintained almost a constant beyond a certain concentration of it. It matched well with the Langmuir-Hinshelwood kinetic model. The reaction rate increased with increasing oxygen content, but the oxygen content was higher than 18%(volume percentage), the reaction rate was restrained. For the influence of water vapor in the gas-phase on the photocatalytic degradation rate of toluene, there was an optimum concentration of water vapor (0.2%). The photocatalytic degradation rate increased with light intensity but the rate leveled off to a constant when the light intensity rose to 3 mW/cm2. The photocatalytic degradation rate constant and the adsorption constant of toluene were obtained by means of the Langmuir-Hinshelwood model, and the reaction products were also identified by FI-RT and GC-MS.
出处
《吉林大学学报（理学版）》
CAS
CSCD
北大核心
2005年第2期247-251,共5页
Journal of Jilin University:Science Edition
基金
国家自然科学基金(批准号:20277015)
关键词
甲苯
光催化
动力学
纳米粒子
toluene
photocatalytic
kinetic
nanoparticle
