Abstract: Ti-bearing blast furnace slag was used to prepare photocatalyst GN. The photocatalytic activity was examined via rhodamine B degradation in different concentrations，and the reaction mechanism was primarily discussed through UV-vis absorption and infrared spectra. Equations for the reaction kinetics in different concentrations were obtained. The photocatalyst GN showed a high activity for rhodamine B degradation to organics with small molar mass. Also，the photocatalyzed degradation in different phases could be expressed with different equations which varied with the concentrations in waste water.

摘要： 以废弃炉渣为原料制备了光催化剂GN，通过催化降解不同浓度的罗丹明B模拟废水，考察了该催化剂的光催化活性。通过GN的红外吸收光谱和紫外吸收光谱，对反应机理进行了初步探讨，拟合了GN催化降解不同浓度模拟废水的反应动力学方程。结果表明：光催化剂GN对罗丹明B模拟废水有很高的降解效率，能将罗丹明B分子转化为小分子有机物。光催化氧化降解的不同阶段可以用不同的动力学方程表征，并且随着模拟废水的初始浓度的不同而不同。