REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

SYNTHESIS OF THE ADSORBENT BASED ON PEGYLATED CELLULOSE FOR THE REMOVAL OF Pb(II) AND Cd(II) IONS FROM WATER

ZLATE VELIČKOVIĆ

University of Defense, Military Academy, Belgrade, zlatevel@yahoo.com

BOBAN ALEKSIĆ

University of Defense, Military Academy, Belgrade, bobisa90_@hotmail.com

ZORAN BAJIĆ

University of Defense, Military Academy, Belgrade, zbajic@sezampro.rs

Abstract: Cellulose fibers, functionalized with 6-amino polyethylene glycol (PEG) through chemical modification of cellulose hydroxyl groups using ethyl-3-chlorine-3-oxypropanole, was prepared and used as a new adsorbent for the adsorption and removal of cadmium and lead ions from water. Obtained material was fully characterized using FTIR and BET techniques, zeta potential and point of zero charge were determined. Ions concentrations in water solution were measured with ICP-MS instrument. The best conditions for the removal of Pb(II) and Cd(II) ions from the solution was examined in the batch system by varying: pH value, time of adsorption and system temperature. Acquired kinetic parameters have shown good agreement with the pseudo second kinetic model. Freundlich and Langmuir adsorption models were used in order to investigate the adsorption behavior of the new adsorbent. The experimental data were suitably fitted with Freundlich model. Thermodynamic parameters for the adsorption of Pb(II) and Cd(II) ions on PEG-Cellulose adsorbent have shown that the adsorption is spontaneous and endothermic. Maximum achieved adsorption capacity, according to Langmuir model, was 14.34 mg g^-1 for Cd²⁺ and 21.93 mg g^-1 for Pb²⁺ which consequently displays the possible application of this adsorbent for the removal of Pb(II) and Cd(II) ions from water.

Keywords: Adsorbent; Cadmium; Lead; Adsorption isotherms.