中文摘要：

研究了1，2，4-三氯苯（TCB）在超声波／零价铁联合体系中的降解，拟一级动力学能很好的拟合降解过程，协同体系中TCB一级降解速率常数（kUS／Fe^0）为0．0459min^-1，约为同等条件下零价铁体系所得kUS的三倍，且大于kFe^0与kUS之和，说明两者之间存在协同效应；考察了零价铁（Fe^0）投加量、初始pH、初始TCB浓度（G0）、超声功率、溶液离子强度等控制参数对TCB降解速率的影响，结果表明，其拟一级速率常数分别在Fe^0投加量6g·L^-1及初始pH8．1时达最大值，随着离子强度、超声功率的增大而增大，随着C0的增大而减小。

英文摘要：

The degradation of aqueous 1,2,4-trichlorobenzene （TCB） by ultrasound combined with element iron （US/Fe^0） was investigated, the pseudo-first-order rate constant, kUS/Fe^0, for TCB degradation by US/Fe^0 was 0.0459 min^-1, which was almost threefold as large as kUS, and greater than the sum of kUS and kUS, these evidences suggested that synergistic effect between US and Fe^0 existed. The influence of Fe^0 dose （[Fe^0]）, solution initial pH, initial TCB concentration, solution ionic strength and ultrasonic power, on the rate constant of TCB degradation by US/Fe^0, were studied. The rate constant was found the largest at [Fe^0] of 6 g·L^-1, and initial pH 8.1 respectively, and increase with the increasing of solution ionic strength and ultrasonic power, but decrease with initial TCB concentration increasing.