表面活性剂和有机粘土矿物对底泥吸附菲的影响  

Effect of surfactant and organoclay on sorption of sediment to phenanthrene

作　　者：刘娜[1,2] 陈畅曙[3] 付云娜[2] 

机构地区：[1]大连理工大学环境与生命学院,辽宁大连116023 [2]国家海洋环境监测中心,辽宁大连116023 [3]大连海事大学环境科学与工程学院,辽宁大连116023

出　　处：《海洋环境科学》2010年第5期623-626,共4页Marine Environmental Science

基　　金：国家自然科学基金资助项目(20307003)

摘　　要：根据底泥原地处理技术原理,基于有机粘土矿物的环保性能,以菲为目标污染物,开展向底泥中加入表面活性剂(十六烷基三甲基溴化铵,HDTMA-Br)和有机粘土矿物(十六烷基三甲基溴化铵改性膨润土,HDTMA改性土)后对其吸附菲的性能影响研究。结果表明,底泥对菲的吸附作用主要表现为表面物理吸附特征,吸附等温线符合Freundlich方程;底泥中加入HDTMA+或HDTMA改性粘土后菲在两相间的表观分配系数增大,吸附分别为表面作用和分配作用;菲在底泥上的解吸曲线呈较好线性,吸附不存在滞后效应,而在加入表面活性剂和有机粘土矿物的底泥上线性变差,对菲的吸附出现不可逆吸附现象,吸附变得稳定;在污染物浓度很低的情况下,pH、盐度和温度的改变对吸附量的影响不大。The toxic organic pollutants in sediments have become the main pollution source in the food cycle.In the field of treating contaminated sediments,in situ treatment technology causes the increasing awareness.Base on the principle of in situ treatment and environmental capability of organoclay,this paper,the effect of surfactant（hexadecyltrimethylammonium bromide,HDTMA-Br） and organoclay（HDTMA modified clay） on sorption of phenanthrene on sediment was studied.Three kinds of sorbants were chosen,namely sediment,sediment mixed with HDMTA＋ and sediment mixed with HDTMA-clay.The mechanisms of sorption and desorption of phenanthrene on these three sorbants were discussed.And how temperature,salinity and pH influenced the sorption were also determined.The results showed that the apparent partition coefficients of phenanthrene between water and particles increased greatly after the sediment was mixed with HDTMA＋ or HDMTA-clay.Desorption curve of phenanthrene on sediment was linear,while those of phenanthrene on other two sorbants tended to be nonlinear,which claimed that the latter has more irreversible fractions and they were more stable.When the experimental conditions changed,the sorption quantities were almost equal.It was concluded that the surfacant and organoclay both could strengthen and stablize sorption of organic pollutants on sediment,but sediment mixed with the surfacant has better sorption capability and less sorption stablization than sediment mixed with the organoclay.

关 键 词：底泥 有机粘土矿物 表面活性剂 吸附作用 菲 

分 类 号：X55[环境科学与工程—环境工程]