摘要
通过静态吸附实验,研究了北京土壤对阴离子表面活性剂LAS、阳离子表面活性剂CTAB和非离子表面活性剂TX-100以及甲苯和萘的吸附行为,探讨了表面活性剂的性质对甲苯和萘吸附的影响。结果表明,6种土样对甲苯和萘的吸附等温线均很好的符合Freundlich吸附模式,而对LAS、CTAB和TX-100的吸附等温线均较好地符合Langmuir吸附模式,其吸附能力的大小顺序为:轻壤土>轻粘土>中壤土>砂壤土>重壤土>紧砂土。3种表面活性剂在土壤中吸附量的大小顺序为:CTAB>TX-100>LAS。同一土壤中,萘的吸附量大于甲苯的吸附量。CTAB对甲苯和萘的解吸率最高可达27.5%和12.1%,TX-100对甲苯和萘的解吸率最高可达64.3%和48.8%,LAS对甲苯和萘的解吸率最高可达75.4%和56.8%,说明CTAB、TX-100和LAS均利于甲苯和萘在土壤表面的解吸,其解吸效果的大小顺序为:LAS>TX-100>CTAB。
Static adsorption experiments were carried out to investigate adsorption of LAS, CTAB and TX-100 in Beijing soils, and to determine the influence of surfaetants on sorption of both toluene and naphthalene. The results indicated that the adsorption isotherms of toluene and naphthalene in six soils were well described by the Freundlich model, while those of LAS, CTAB and TX-100 were well described by the Langmuir model, and the adsorption capacity in the six soils with an order was： light loam, light clay, medium loam, sand loam, dense loam and dense sand. In terms of the same soils studied, the adsorption ability for naphthalene was higher than that of toluene, and the adsorbed amount of CTAB was higher than that of TX-100, which was higher than that of LAS. The desorption rates for toluene and naphthalene in the presence of CTAB, LAS and TX-100 were found to be 27.5%, 12.1% and 64.3%, 48.8% and 75.4%, 56.8%, respectively, suggesting that the three surfaetants are all favorable to desorption of toluene and naphthalene. It may be concluded that LAS plays a more important role in desorption of toluene and naphthalene than TX-100, and TX-100 has a more positive effect on desorption than CTAB.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2006年第B09期512-517,共6页
Journal of Agro-Environment Science
基金
国家自然科学基金(40372109)
关键词
吸附
北京土壤
表面活性剂
甲苯
萘
adsorption
Beijing soils
surfaetants
toluene
naphthalene
