Sorption Of Diesel Oil On Beijing Soils

Static experiments for sorption behavior of diesel oil, toluene andnaphthalene on Beijing soils were carried out to investigate the influence of soilcomponents, pH, temperature and ethanol on sorption of diesel oil, and to analyzethe effect of temperature, pH and surfactants on sorption of toluene andnaphthalene. The results indicated that the adsorption isotherms of diesel oil ondifferent soils were well described by the Langmuir type, while those of tolueneand naphthalene were well described by the Freundilich model. There was apositive linear correlation between the adsorbed quantity and organic mattercontent. Organic matter content being similar, adsorption increased withincreasing soil clay content. A positive linear correlation was observed betweenthe adsorbed quantity and the montmorillonite content, which suggested that themontmorillonite content of clay components had a great impact on adsorption.The addition of ethanol to diesel oil was found to decrease adsorption.Theincrease of temperature and pH was not favourable to adsorption. CetyltrimethylAmmonium Bromide (CTAB) and sodium dodecyl benzene sulfonate (LAS) bothhad a positive effect on desorption of toluene and naphthlaene, and LAS played amuch more important role in desorption.