2011•Nongye huanjing kexue xuebaoRequires access
Adsorption Characteristics of Phenanthrene and Naphthaleneon on Lou Soil
Wan Juan-min
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Abstract
Batch adsorption experiments were employed to evaluate the adsorption characteristics of phenanthrene and naphthalene on Lou soil,the factors affected its adsorption,i.e.temperature,pH,ionic strength and CaCO3,and the fitness of adsorption equations,i.e.Henry equation,Freundlich model and deBoer-Zwikker equation were studied also.The results showed that the adsorption of both phenanthrene and naphthalene on Lou soil are non-linear style,the Freundlich equation is the best model to describe their adsorption isotherm.The adsorption of phenanthrene and naphthalene on Lou soil decreased with an increase of temperature and pH,but increased with an increase of ionic strength.The change in Gibbs free energy was less than 0 indicates the adsorption was spontaneous,the change of enthalpy was the driving force of this spontaneous adsorption due to the thermodynamic characteristics of both enthalpy decrease and entropy decrease.The adsorption of phenanthrene and naphthalene on CaCO3 were also nonlinear,and CaCO3 showed a greater contribution to adsorption of phenanthrene and naphthalene on Lou soil.