二氯苯和三氯苯的二氧化钛催化光致分解

PHOTO CATALYTIC DECOMPOSITION OF DICHLOROBENZENE AND TRICHLOROBENZENE OVER TiO_2 POWDER

本文研究了二氯苯(DCB)和1,2,4-三氯苯(TCB)的TiO_2禁带激发催化光致分解。在水溶液中,含氯芳香化合物的催化光致分解百分率相对大小为:o-DCB>m-DCB>TCB>p-DCB,并呈现动力学一级反应;混合溶液(o-DCB,m-DCB和TCB)中各组分的催化光致分解也分别呈现动力学一级反应,其光致分解百分率的相对大小为:o-DCB>m-DCB>TCB,并分别低于各单种组分的光致分解百分率。本文还对这些催化光致分解反应的可能机理进行了讨论。

The photocatalytic decomposition of dichlorobenzenc(DCB) and 1,2,4-trichlorobenzcnc(TCB) in aqueous suspension of TiO_2 has been studied. The photocatalytic decomposition followed first order kinetics and the ralative rates of decomposition increased in the order of o-DCB>m-DCB>TCB>p-DCB. First order kinetics was also observed in a three-component system (o-DCB,m-DCB and TCB), and decomposition increased accordingly: o-DCB>m-DCB>TCB, but in less proportion compared to their respective single component systems. Also, discussion was made as to the possible pathway of TiO_2 photocatalytic decomposition of these compounds in aqucous solution.