Choy W K, Chu W
Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Hom, Hong Kong.
Chemosphere. 2007 Feb;66(11):2106-13. doi: 10.1016/j.chemosphere.2006.09.027. Epub 2006 Nov 17.
Photodecay of o-chloroaniline (o-ClA) in various combinations of UV sources, TiO2, and oxyhalogens was investigated. To improve the conventional photocatalytic process by using UV/TiO2, the addition of oxyhalogens (ClO3(-), BrO3(-) and IO3(-)) into UV/TiO2 system was studied and the effect in such addition is very encouraging for all the selected additives. Oxyhalogens are capable of deferring the electron-hole recombination of TiO2 which significantly improved its catalytic performance. The presence of IO3(-) in UV/TiO2 resulted in the fastest o-ClA decay among three oxhalogens at the same dosage. The decay of o-ClA in UV/TiO2/oxyhalogen process is characterized by a two-stage pseudo-kinetics, where a faster initial decay was followed by a retardation state. A mathematics model was successfully established for the prediction of the two-stage decay of o-ClA in UV/TiO2/IO3(-) with any designed [IO3(-)] concentration.
研究了邻氯苯胺（o-ClA）在各种紫外线源、二氧化钛（TiO2）和卤氧化物组合中的光降解情况。为了通过使用紫外线/二氧化钛来改进传统的光催化过程，研究了在紫外线/二氧化钛体系中添加卤氧化物（ClO3(-)、BrO3(-)和IO3(-)）的情况，并且这种添加对所有选定添加剂的效果非常令人鼓舞。卤氧化物能够延缓二氧化钛的电子-空穴复合，这显著提高了其催化性能。在相同剂量下，紫外线/二氧化钛体系中IO3(-)的存在导致三种卤氧化物中o-ClA的降解最快。紫外线/二氧化钛/卤氧化物过程中o-ClA的降解具有两阶段准动力学特征，即初始快速降解后接着是一个缓慢阶段。成功建立了一个数学模型，用于预测紫外线/二氧化钛/IO3(-)体系中o-ClA在任何设计的[IO3(-)]浓度下的两阶段降解。
