掺杂改性TiO_2紫外光催化降解甲苯的动力学研究

Photocatalysis Degradation Kinetics of Prepared Modified TiO_2 to Toluene under UV-light

探索了用水热反应制备的锐钛型掺杂改性的TiO_2(即A-TiO_2)对甲苯的光催化降解作用。通过分析甲苯的初始浓度、TiO_2用量、掺铁量和溶液的p H值对光催化速率的影响,研究改性TiO_2催化甲苯的动力学行为;结果表明:甲苯溶液初始浓度为1.2 g/L(p H=5)、催化剂用量为2.0 g/L,掺铁量为4%(摩尔分数)、室温下紫外光照(λ=365 nm)反应2 h,甲苯的降解率D%(47.93%)和表观反应速率常数k达到最大值0.2523 h-1。光催化反应符合L-H动力学方程,降解过程表现为拟一级反应。

The kinetics of as-prepared anatase iron-doping TiO2 （ i. e. A-TiO2 ） via hydrothermal reaction catalyzing toluene is researched by analysis of the influence of the toluene＇ S initial concentration, the TiO2 dosage, the amount of iron-doping in TiO2 and pH value on photochemical catalysis speed. The results show that the decolorization rate D% （47.93%）and degradation observed rate constant k（0.2523 h^-1） of toluene achieve maximum under follow conditions： a toluene＇s initial concentration 1.2 g/L （pH = 5 ）, a catalyst dosage 2.0 g/L, an amount of iron-doping 4% （ mole fraction）, and an irradiating with ultraviolet light （λ = 365 nm）time 2 h at room temperature. The photo-catalytic process of toluene conforms to the rule of L-H kinetics and follows the first-order reaction.