对硝基苯胺在表面活性剂改性黄土中的吸附行为

研究了用阳离子表面活性剂改性的黄土对水中对硝基苯胺的吸附行为以及2，4-二氯苯酚对对硝基苯胺吸附行为的影响。结果表明，天然黄土和改性黄土对对硝基苯胺的等温吸附曲线均符合Freundlich方程，改性后的黄土对对硝基苯胺吸附能力明显强于天然黄土，改性黄土的吸附能力主要取决于阳离子表面活性剂的加入量；2，4-二氯苯酚与对硝基苯胺存在竞争吸附；2，4-二氯苯酚的非离子形态对对硝基苯胺在改性黄土上的吸附量的影响大于它的离子形态；对硝基苯胺在阳离子表面活性剂改性后的黄土上的吸附行为符合双模式吸附理论。

Sorption behavior of p-nitroaniline on surfactant-modified loess soils

The sorption behaviors of p-nitroaniline in the loess soils that were individually modified by a cation surfactant-hexadecyltrimethylammonium bromide( HDTMAB) are studied while the influences of 2 ,4-dichlomphenol are investigated. The sorption isotherms of p-nitroaniline on natural and HDTMAB-modified loess soils agrees to Freundlichequation. The capacities of the HDTMAB-modified loess soils on p-nitroaniline are apparently higher than the natural loess soils when the sorption capacities increases proportionally with the adding quantity of the surfactants. However, with the adding of 2, 4-dichbomphenol in soil matrix, the sorption capacities of the HDTMAB-modified loess soils on pnitroaniline are reduced. The neutral forms of 2, 4-dichborophenol tend to take higher effects on the adsorbed amount of p-nitroaniline by HDTMAB-modified loess soils than the anion form. The sorption behavior of p-nitroaniline on HDTMAB-modified loess soils accords with dual-mode sorption mechanism for soil organic matter.