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Comparative studies on the adsorption of Pb(II) ions by fly ash and slag obtained from CFBC technology

Kalak Tomasz, Cierpiszewski Ryszard

Polish Journal of Chemical Technology

2019

Vol. 21, nr 4

72--81

Fly ash and slag were examined for the removal processes of Pb(II) ions from water in batch experiments under different conditions of adsorbent dosage, initial concentration, pH and contact time. The materials are industrial waste generated from the high temperature treatment of sewage sludge by the circulating fluidized bed combustion (CFBC) technology. Physical and chemical properties, as well as adsorption efficiency and calculated maximum adsorption capacity of Pb(II) ions were determined using a variety of methods. The kinetic analysis revealed that the adsorption process is better described by the pseudo-second order equation and it is well fitted to the Freundlich model.