Abstract
The kinetics, thermodynamics, and isotherms of Hg(II) ion adsorption onto silica-gel supported diethylenetriamine adsorbents, SG-HE-dD, SG-HO-dD, SG-HE-pD, and SG-HO-pD (where SG means silica-gel; HE, heterogeneous; HO, homogeneous; d, direct; p, protection; and D, diethylenetriamine), prepared by so-called heterogeneous-direct amination, homogeneous-direct amination, heterogeneous end-group protection, and homogeneous end-group protection methods, respectively, were investigated. The results showed that the adsorption processes of Hg(II) ions followed well a pseudofirst-order model onto SG-HE-dD, SG-HO-dD, and SG-HE-pD, while a pseudosecond-order model was followed onto SG-HO-pD. Film diffusion might be dominated in the adsorption process of Hg(II) ions onto the four adsorbents. Thermodynamic analysis revealed that the adsorption behaviors of Hg(II) ions onto the four adsorbents were endothermic processes, resulting in higher adsorption capacities at higher temperature. The Langmuir, Freundlich, and Redl...
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