超声波/零价铁协同降解三氯甲烷特性研究  

Characteristics of Trichloromethane Degradation by Ultrasound Combined with Zero-valent Iron

作　　者：张良长[1] 戴友芝[1] 田凯勋[1] 程婷[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：《环境科学研究》2008年第6期211-216,共6页Research of Environmental Sciences

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

摘　　要：研究三氯甲烷在单独超声(US)、单独零价铁(Fe0)及超声波/零价铁协同体系(US/Fe0)中的降解发现,拟一级动力学能很好地拟合降解过程,协同体系中三氯甲烷一级降解速率常数(KUS/Fe0)为0.0103min-1,约为同等条件下零价铁体系所得KFe0的3倍,且大于KFe0与KUS之和,说明二者之间存在协同效应.考察零价铁投加量〔ρ(Fe0)〕,初始pH,初始三氯甲烷浓度(c0),超声功率,溶液离子强度等控制参数对三氯甲烷降解速率(KUS/Fe0)的影响,结果表明,其拟一级速率常数分别在ρ(Fe0)为6g/L,初始pH为6.0,c0为5mmol/L以及0.5mol/LNa2SO4当量离子强度下达最大值,并且随着超声功率的增大而增大.Trichloromethane degradation in the synergistic system of ultrasound and elemental iron was investigated. The results indicated that the degradation process of trichloromethane can be perfectly fitted by the pseudo-first-order kinetics. The first-order rate constant of degradation （ KUS/Fe^0 ） of trichloromethane in this synergistic system was 0. 010 3 min^-1 , which was almost threefold as large as Fe^0 , and was higher than the sum of Kus and Fe^0 . This suggested that synergistic effects existed between ultrasound and Fe^0 . This study also investigated the effects of ρ（Fe^0）, initial pH, initial trichloromethane concentration （c0）, ultrasonic power and ionic strength on the degradation rate of trichloromethane. The results showed that the pseudo-first-order rate constant reached the highest at the conditions of/9 （Fe^0） = 6 g/L, initial pH = 6.0, co = 5 mmol/L, and c （Na2 SO4 ） = 0.5 mol/L, and the pseudo-first-order rate constant increased with increasing ultrasonic power.

关 键 词：超声空化 废水处理 三氯甲烷 铁 

分 类 号：X703.1[环境科学与工程—环境工程]