关键词: 二氧化钛 , 活性炭 , 光催化剂 , 动力学模型

Abstract: This study is focused on the kinetic characteristics of photocatalytic degradation of gaseous organic compounds on modified Titanium dioxide (TiO2)/activated carbon (AC) composite photocatalyst (MTA). The MTA, which co-doping with iron (Fe) and nitrogen (N), were synthesized by sol–gel method, and the photocatalytic performance of it was experimentally investigated under different reaction conditions (different organic compounds and initial concentrations). On this basis, the experimental data obtained were fitted to the zero, first and second order kinetic model, and the factors affecting the kinetic model were analyzed. It was clearly demonstrated that the experimental data of toluene and acetone on MTA fit quite well with second order kinetic model equation: X/c0 (1-X) = kt, and the experimental data of formaldehyde fits well with zero order kinetic model equation: c0X = kt; When increasing the initial toluene concentration, the fitting results of degradation rate were still consistent with second order kinetic model equation, but the rate constant increased.

Key words: titanium dioxide, activated carbon, photocatalyst, kinetic model