Fly Ash Coated Chitosan as Efficient Adsorbent for Removal of Heavy Metal Ions from Waters and Wastewaters (original) (raw)
The aim of the paper was to study the effectiveness of Cu(II) removal onto fly ash (FAI) and fly ash coated by chitosan (FAICS). The changes in the morphology and physicochemical parameters of FAI activated at different temperatures were also investigated in order to optimize the modification process. The obtained composite was characterized using the FTIR, SEM, BET and XRD methods. The following parameters such as initial concentration, pH, contact time, temperature and sorbent dosage were taken into account in order to evaluate its applicability in Cu(II) ions removal. The process kinetics was described using the pseudo first order, pseudo second order and intraparticle diffusion models. The Langmuir and Freundlich isotherm models were applied for analyzing experimental sorption equilibrium data. The thermodynamic parameters such as enthalpy, entropy and free energy of process were determined. The results showed the highest efficiency in the case of sorption of Cu(II) onto FAICS c...
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