改性土壤对水中苄黄隆的吸附行为研究  

SORPTION OF BENSULFURON-METHYL IN CATIONIC SURFACTANTS MODIFIED SOILS

作　　者：赵景婵[1] 郭治安[1] 陈经涛[2] 王鹏超[1] 

机构地区：[1]西北大学化学系,西安710069 [2]陕西教育学院生化系,西安710061

出　　处：《离子交换与吸附》2003年第4期324-330,共7页Ion Exchange and Adsorption

基　　金：西北大学校内基金 (编号99NW50)

摘　　要：研究了季铵盐阳离子表面活性剂四甲基铵离子 (TMA) 和十六烷基三甲基铵离子(HDTMA) 改性的黄土1,黄土2,沉积物对水中苄黄隆的吸附作用。结果表明:改性后土壤对苄黄隆的吸附能力提高。同时考察了改性土壤对苄黄隆吸附的热力学行为。结果表明:HDTMA改性的土壤对苄黄隆的吸附等温线为线性,吸附类型以分配为主。HDTMA改性黄土1吸附热为-6.12kJ/mol,HDTMA改性黄土2的吸附热为-8.44kJ/mol,HDTMA改性沉积物的吸附热为-4.04kJ/mol。结合力以疏水作用力为主;TMA改性的土壤对苄黄隆的吸附等温线符合Freundlich方程。考察了溶液pH对吸附量的影响,结果表明在酸性条件下,改性土壤的吸附能力较大。Three soils were modified with two kinds of cationic surfactants tetramethylammonium (TMA) and hexadecyltrimethylammonium (HDTMA) in order to increase their sorption powers. The adsorption of bensulfuron-methyl on six kinds of modified soils has been investigated. Modified soils have higher ability to sorb bensulfuron-methyl than unmodified ones. It was found that adsorption isotherms of hexadecyltrimethylammonium- modified soils could fit Linear equation; adsorption isotherms of tetramethylammonium- modified soils could fit Freundlich equation. The sorption of bensulfuron-methyl on six modified soils was via partition. The sorption of hexadecyltrimethylammonium modified soils parameters of thermodynamics were in the range of 8.44kJ/mol^-4.04kJ/mol.

关 键 词：改性土壤 水 苄黄隆 吸附行为 阳离子表面活性剂 土壤污染 

分 类 号：X53[环境科学与工程—环境工程] S153[农业科学—土壤学]