表面活性剂对可离子化有机化合物在黄土中吸附行为的影响  

INFLUENCE OF SURFACTANT ON SORPTION OF IONIZABLE ORGANIC COMPOUNDS IN LOESS SOIL

作　　者：陈慧[1] 周文军[1] 姜梅[1] 展惠英[1] 刘国光[2] 

机构地区：[1]西北师范大学化学化工学院,兰州730070 [2]河南师范大学化学与环境科学学院,新乡453002

出　　处：《环境化学》2003年第5期434-439,共6页Environmental Chemistry

基　　金：国家自然科学基金 (2 99770 1 5 );河南省环境科学与工程重点学科开放实验室 (2 0 0 1 )资助项目

摘　　要：研究了 2 4 二氯苯酚、 2 4 二硝基苯酚和苯甲酸三种可离子化有机化合物在天然黄土和阳离子表面活性剂改性黄土中的吸附行为 .讨论了pH值、离子强度和二价重金属阳离子对可离子化有机化合物在改性黄土中吸附的影响 .提出了可离子化有机化合物在改性黄土中的吸附模型 ,吸附等温曲线可分解为两条分别代表离子和非离子形态的等温吸附曲线 ;其吸附行为可用双模式吸附理论来解释 .在 2 4 二硝基苯酚共存时 ,苯甲酸在改性黄土中的吸附量减小 。This paper studied the sorption behavior of three ionizable organic compounds(IOCs),such as 24-dichlorophenol(DCP),24-dinitrophenol(DNP)and benzoic acid(BA),on loess soil modified with a cation surfactant-brimide hexadecyltrinethylammonium(HDTMA).The effects of pH,ionic strength and divalent heavy metal cation in environment were investigated.The sorption isotherms of IOCs on the HDTMA modified soil appeared to be nonlinear and obeyed to Freundlich equation and the sorption machanism of IOCs could be interpreted with a dual-mode model of sorption to soil organic metter.A model represented the sorption of IOCs with two specific Freundlich type isotherms for ionic and neutral forms was derived based on the experimental data.In the binary solute systems,the sorbed amounts of BA were reduced in the presence of DNP,which indicated that BA had a competitive effect.

关 键 词：表面活性剂对 离子化 有机化合物 黄土 吸附 改性 土壤污染 

分 类 号：O647.3[理学—物理化学]