有机粘土矿物对水中低浓度菲的吸附性能和机理  

Adsorption of phenanthrene on organic clays

作　　者：刘娜[1] 陈畅曙[2] 付云娜[3] 

机构地区：[1]大连理工大学环境与生命学院,辽宁大连116023 [2]大连海事大学环境科学与工程学院,辽宁大连116023 [3]国家海洋局海洋环境保护研究所,辽宁大连116023

出　　处：《环境污染与防治》2006年第11期811-813,830,共4页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.20307003);国家海洋局青年基金资助项目(No.2003614)。

摘　　要：分别选用十六烷三甲基溴化铵(HDTMA-Br)、四甲基溴化铵(TMA-Br)、聚乙二醇(PEG)表面活性剂改性天然粘土矿物,研究其对水中低浓度多环芳烃类难降解有机物菲的吸附性能和机理,并讨论了有机粘土的用量对吸附菲的性能的影响,验证了有机粘土矿物吸附菲后的稳定性。3种有机粘土矿物对菲的吸附等温线均呈中凹型,表现为分配系数(Kp)逐渐增大,表明吸附是分配作用和溶剂化效应共同作用的结果。根据Kp及土样有机碳含量(foc)所得的经有机碳归一化的分配系数(Koc)基本为常数,远远高于天然土壤/沉积物的Koc。在相同实验条件下,3种有机粘土矿物中HDTMA改性粘土矿物对菲的吸附性能最强,PEG改性粘土矿物次之,TMA改性粘土矿物最差。Three organic clay samples were prepared by mixing a small quantity of natural clay with surfactant solutions of hexadecyltrimethylammonium bromide （HDTMA-Br）, tetramethylammonium bromide （TMA-Br） and polyethylene glycol 400 （PEG 400）. Series of adsorption isotherm experiments were performed to determine the capacity of organic clays for polycyclic aromatic hydrocarbon （PAH） phenanthrene. The dish shape isotherm curves suggested that adsorption of phenanthrene resulted from both partition and solvent effect. The organic content normalized clay samples had the same distribution coefficient （Koc value）. The HDTMA-modified clay had the highest capacity, followed by the PEG-modified clay and then TMA-modified clay. Less than 5% of adsorbed PAH was released after multiple washing.

关 键 词：有机粘土矿物 吸附作用 低浓度菲 

分 类 号：X703[环境科学与工程—环境工程]