title: Effect of impregnation of activated carbon with chelating polymer on adsorption kinetics of Pb2+.
abstract: The effects of polyethyleneimine (PEI) impregnation on the Pb(2+) adsorption kinetics of palm shell-activated carbon and pH profile of bulk solution were investigated. Adsorption data were fitted to four established adsorption kinetics models, namely, pseudo-first-order, pseudo-second-order, Elovich equation and intraparticle diffusion. It was found that PEI impregnation at 16.68 and 29.82 wt% PEI/AC increased the Pb(2+) uptake rate while the opposite was observed for PEI impregnation at 4.76 and 8.41 wt% PEI/AC. The increased uptake rates were due to higher concentration of PEI molecules on the surface of clogged pores as well as varying pore volumes. The adsorption kinetics data fitted the pseudo-second-order model better than the pseudo-first-order model, implying chemisorption was the rate-controlling step. The bulk solution pH generally showed an increasing trend from the use of virgin to PEI-impregnated activated carbon.
authors.affiliation: Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia. mk_aroua@um.edu.my
authors.forename: Mohamed Kheireddine
authors.initials: MK
authors.lastname: Aroua
authors.forename: Chun Yang
authors.initials: CY
authors.lastname: Yin
authors.forename: F N
authors.initials: FN
authors.lastname: Lim
authors.forename: W L
authors.initials: WL
authors.lastname: Kan
authors.forename: Wan Mohd Ashri Wan
authors.initials: WM
authors.lastname: Daud
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry; D032462:Cycadopsida / Q000737:chemistry; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D011094:Polyethyleneimine / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D002614:Chelating Agents; D011108:Polymers; D014874:Water Pollutants, Chemical; D002606:Charcoal; D007854:Lead; D011094:Polyethyleneimine