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A novel poly(acrylic acid-co-acrylamide)/sawdust composite was synthesized by copolymerization of partially neutralized acrylic acid and acrylamide with sawdust using N,N-methylenebisacrylamide as a crosslinker and potassium persulfate/sodium sulphite as initiators. The composite was characterized by FTIR, XRD, SEM, EDX and BET techniques. The adsorption of Cd(II) and Pb(II) ions on composite in aqueous solution was studied in batch experiments optimizing reaction parameters like initial concentration, contact time, pH and temperature. The adsorption kinetics followed pseudo second order kinetic model. Adsorption isotherms were applied to the experimental data which fitted well with Langmuir and Freundlich isotherms. The maximum adsorption capacities (qm) (from Langmuir model) of the prepared composite at 25 C, were 28.57 mg g and 32.25 mg g for Cd(II) and Pb(II) ions, respectively. Activation energy data (12.148 kJ mol and 7.165 kJ mol Cd(II) and Pb(II), respectively) indicated physiosorption. Results of thermodynamic parameters like o ΔG , o ΔH and o ΔS for both Cd(II) and Pb(II) ions suggested the spontaneity and endothermic nature of the process. The newly synthesized composite attributed to its cost effective and environment friendly nature and ease of synthesis, could be deemed as a potential candidate for the removal of Cd(II) and Pb(II) ions from waste-water.

revue roumaine de chimie

Synthesis and characterization of poly(acrylic acid-co-acrylamide)-sawdust composite for the adsorptive removal of Cd(II) and Pb(II) from aqueous solutions