摘要

The adsorption and desorption behaviors of dissolved petroleum hydrocarbons (DPHs) in the seawater-sediment system were investigated using the tidal flat sediment as adsorbent and crude oil as adsorbate. The adsorption and desorption thermodynamic and kinetic laws of DPHs on sediment were systematically studied. The results showed that the processes of adsorption and desorption were described by the first-order kinetic model. The rate of desorption was slower than that of adsorption, and about 49% petroleum hydrocarbons was remained on sediment. Therefore the potential pollution risk would be in existence for a long term. The adsorption isotherms could be better fitted by the linear isotherm model than Freundlich and Langumir models, and the adsorption effect decreased at elevated temperature. The adsorption belonged to physical adsorption according to the thermodynamic analysis. The results would provide theoretic bases for the transportation and migration of DPHs in marine environment.

  • 出版日期2013

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