Effect of Clay Minerals and HA on Sorption of Fluoranthene to Surface Sediments

Abstract

Several surface sediment samples (JL1, JL2, YZ1~YZ3) were collected from different sites of Yangtze River and Jialing River in Chongqing downtown area. Sorption behavior of fluoranthene (Fluo), one of the typical PAHs, onto humic acid (HA) extracted from the samples and the effect of the clay minerals (Kaolinite and Montmorillonite) on sorption performance of Fluo were carried out. The results showed that addition of clay minerals was significantly enhanced Fluo adsorption properties of sediments. Montmorillonite gave a better enhancing performance than Kaolinite. The adsorption effects of the inorganic minerals of the sediment for Fluo could not be neglected. The unit Freundlich model was applied to describe the adsorption isotherms of HA samples to Fluo. The modified coefficient of Kf ́ were in order: YZ2>JL2>YZ1>YZ3>JL1. The adsorption performance was comparatively highly correlated with the polarity of HA, element contents and characteristics of functional groups.