表面活性剂在北京碱性土壤中的吸附行为研究

通过静态吸附实验,研究了北京碱性土壤对阴离子表面活性剂SDS、阳离子表面活性剂CTAB和非离子表面活性剂Tween80的吸附行为,考察了温度对表面活性剂吸附的影响.结果表明:7种不同土样对SDS、CTAB和Tween80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2号轻壤土》轻粘土》中壤土》砂壤土》5号轻壤土》重壤土》紧砂土,这主要是由于7种土样的pH、有机质含量和机械组成不同的缘故;同一土壤中,CTAB的吸附量》Tween80的吸附量》SDS的吸附量;温度的升高,不利于SDS和CTAB在土壤中的吸附,而有利于Tween80的吸附.

Study on the adsorption behavior of surfactants on Beijing alkali soils

In this paper, static adsorption experiments were carried out to investigate the adsorption of SDS, CTAB and Tween80 on alkali soils from Beijing and to determine the influence of pH on sorption of the three surfactants. The results indicated that the adsorption isotherms of SDS,CTAB and Tween80 on seven soils were well described by the Langmuir type, and the adsorption capacity on the seven soils from high to low was.. Light loam NO. 2, Light clay, Medium loam, Sand loam,Light loam NO. 5, Dense loam and Dense sand, because of different pH, soil organic matter content and mechanical composition of the seven soils. On the same soil the adsorbed amount of CTAB was higher than that of Tween80, which was higher than that of SDS. The increase of temperature was not favourable to adsorption of SDS and CTAB, but favourable to adsorption of Tween80.