中文摘要：

以异丙醇作为空穴捕获剂和氢供体,在除氧条件下将TiO2导带累积的电子用于还原溴代污染物十溴联苯.研究显示,十溴联苯可以被快速降解,其半衰期仅为6.5min,一级反应速率常数为（0.11±0.01）min-1.同时研究了水和有机酸碱以及不同溶剂对降解速率的影响,结果表明：水的存在抑制反应的进行;甲酸的加入使反应减缓而有机碱三乙胺的加入会促进反应进行;在乙腈和异丙醇溶剂中十溴联苯可发生明显降解,但在正己烷、甲苯溶液中,由于十溴联苯很难吸附到TiO2表面,降解几乎无法进行.基于上述结果,进一步推测了可能的反应机理.

英文摘要：

During the photocatalytic reaction, the VB hole has been scavenged by isopropyl alcohol and the elec- tron accumulated in CB of TiO2 has been used for the reduction of deeabromodiphenyl （PBB209） under anoxic condi- tion. The experiment reveals that PBB209 has been rapid degradated by TiO~, and the kinetics is fitted by pseudo- first-order process, giving a rate constant of （0. 11 ! 0.01） min ~ （tl/2 = 6. 5 rain）. The degradation of kinetics of PBB209 has been affected by different conditions, such as various solvents, the presence of H2 O, acids or bases. The experimental results indicate that the degradation has been accelerated in the presence of base, but been greatly depressed by acids and H20. The degradation of PBB209 has been observed in acetonitrile and isopropyl alcohol solu- tion. But in the hexane and toluene solution; where the adsorption of PBB209 is weak, the degradation scarcely oc- curs. The photocatalytic mechanism was further proposed on the basis of experimental results.