零价铁协同超声波降解2，3，4，6-四氯酚的特性  

CHARACTERISTICS OF 2,3,4,6-TETRACHLOROPHENOL DEGRADATION BY ULTRASOUND IN THE PRESENCE OF ELEMENT IRON

作　　者：戴友芝[1] 张良长[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,湘潭411105

出　　处：《环境化学》2009年第1期49-53,共5页Environmental Chemistry

基　　金：国家自然科学基金资助项目(No.20477034);湖南省教育厅资助科研项目(No.06C823).

摘　　要：研究了2,3,4,6-四氯酚(TeCP)在超声波/零价铁协同体系中的降解,结果表明,拟一级动力学能很好的拟合降解过程,协同体系中TeCP一级降解速率常数为0.0141min^(-1),为同等条件下零价铁体系降解速率常数的10.07倍,且大于两者之和,说明两者之间存在明显协同效应;零价铁(Fe^0)投加量、初始pH值、初始TeCP浓度(C_0)、超声功率和溶液离子强度等控制参数对TeCP降解速率的影响表明,其拟一级速率常数在Fe^0量为2g·l^(-1),初始pH值为6.0,离子强度0.8mol·l^(-1)Na_2SO_4以及超声功率350W时达最大值,并随着C_0的升高而降低.The degradation of aqueous 2,3,4,6-tetrachlorophenol （TeCP） by ultrasound combined with element iron （ US/Fe^0） was investigated, the pseudo-first-order rate constant, kUS/Fe^0, for TeCP degradation by US/Fe^0 was 0. 0141min^-1, which was 10. 07 times as large as kFe0, and greater than the sum of kUS and kFe0, these evidences suggested that synergistic effects between US and Fe^0 existed. The influences of Fe^0 dose （ [ Fe^0] ）, solution initial pH, initial TeCP concentration, solution ionic strength and ultrasonic power, on the rate constant of TeCP degradation by US/Fe^0, were studied. The rate constant was found largest at [ Fe^0] 2 g·l^-1 , initial pH 6.0, 0. 8mol·l^-1 Na2SO4 of ionic strength and 350 W of ultrasonic power respectively, and decrease with initial TeCP concentration increasing.

关 键 词：超声波 2 3 4 6-四氯酚 零价铁 降解 

分 类 号：X132[环境科学与工程—环境科学]