二氧化钛对活性艳红X-3B的光催化降解研究

Study on Photocatalytic Degradation of Reactive Brilliant Red X-3B in Water by Titanium Dioxide

以TiO2 作为光催化剂 ,研究了TiO2 对活性艳红X - 3B的光催化氧化降解行为。结果表明 ,以锐钛矿为主的混晶型TiO2 的催化活性最好 ;X - 3B的光催化降解动力学符合Lang muir Hinshelwood动力学模式 ,并求出其动力学参数k(表观反应速率常数 )为 0 5 92 1,KA(吸附平衡常数 )为 0 172 5 ;温度对X - 3B的降解影响很小 ,其活化能仅为 6 0 4kJ/mol;溶液中盐度的增加会不断降低TiO2 对X - 3B的光催化降解速率。

The photocatalytic degradation behavior of aqueous reactive brilliant red X-3B on TiO_2 was studied.The experimental trsults show that the mixture crystal of TiO_2 whose major component is anatase has the best catalytic reactivity;the degradation kinetics of X-3B is accorded with Langmiur-Hinshelwood model and its kinetic parameter k (reaction rate constant) and K_A(adsorption equilibrium constant) are 0.5921 and 0.1725 respectively;temperature has a little effect on the degradation of X-3B,whose activation energy is only 6.04 kJ/mol;moreover,the increasing of solution salinity will reduce the degradation rate of X-3B.