改性土壤对地下水中苯系污染物的吸附

SORPTION OF BENZENE HYDROCARBON IN MODIFIED GROUNDWATER BY MODIFIED SOILS

研究了用阳离子表面活性剂改性的土壤对模拟地下水中的苯系污物苯、甲苯、二甲苯的吸附．获得了两种改性土壤对苯系污染物的吸附等温线，结果表明：用长链季胺盐阳离子表面活性剂十六烷基三甲基溴化铵（ＨＤＴＭＡ）改性后的土壤，吸附水中苯系污染物的能力明显高于未改性土壤．其改性后土壤的吸附能力主要取决于土壤的阳离子交换容量和有机阳离子的性质。

In this paper, the sorption of benzene, methylbenzene and dimethylbenzene from simulative groundwater by modified soil with hexadecyltrimethylammonnium (HDTMA) bromide and tetramethylammonium (TMA) bromide were investigated. Some sorption isotherms and sorption coefficients were obtained. The result indicated that the HDTMA modified soils had a high ability to remove the benzene hydrocarbon from simulative groundwate. The sorption capacity of modified soils depends on the CEC of soil and properties of organic cations. The mechanism of sorption by modified soils was discussed.