Effect of ionic strength on the adsorption behavior of phenol over modified activated clay

AbstractIn this paper, the effect of several inorganic salts (NaCl, KCl, MgCl2, ZnCl2, Na2SO4, Na3PO4) on phenol adsorption at different ionic strength by cetyl trimethyl ammonium bromide and CaO modified activated clay was studied. The adsorption isotherm, adsorption kinetics and thermodynamic in the presence of NaCl were also investigated. The results showed that phenol removal efficiency has been influenced by the co-existed ions. With the increase of ionic strength from 0.5 to 3 mol kg−1, the removal of phenol slightly increased, except for ZnCl2. The adsorption kinetics showed that the adsorption of phenol can be represented by pseudo-second-order kinetic. The Freundlich model fitted the two processes well. The thermodynamic parameters showed that the two adsorption processes were both exothermic, spontaneous nature, randomness decreasing process.

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