超声波/零价铁联合降解1,2,4-三氯苯特性研究  

CHARACTERISTICS OF 1,2,4-TRICHLOROBENZENE DEGRADATION BY COMBINATION OF ULTRASOUND AND ELEMENT IRON

作　　者：张良长[1] 戴友芝[1] 田凯勋[1] 罗春香[1] 

机构地区：[1]湘潭大学环境科学与工程系,湖南湘潭411105

出　　处：《水处理技术》2008年第11期39-43,共5页Technology of Water Treatment

基　　金：国家自然科学基金资助项目(20477034);湖南省教育厅资助科研项目(06C823)

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/Fe0)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kFe0与kUS之和,说明两者之间存在协同效应;考察了零价铁(Fe0)投加量、初始pH、初始TCB浓度(C0)、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Fe0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。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.

关 键 词：超声空化 废水处理 氯苯 铁 

分 类 号：X031.7[环境科学与工程]