title: Comparison of two-stage sorption design models for the removal of lead ions by polyvinyl-modified Kaolinite clay.
abstract: Kaolinite clay obtained from Ubulu-Ukwu, Delta State in Nigeria was modified with polyvinyl-alcohol (PVA) reagent to obtained PVA-modified Kaolinite clay. Kinetic and equilibrium data were obtained for the batch adsorption of Pb(2+) onto PVA-modified Kaolinite clay. Time-dependent Langmuir and pseudo-second order kinetic models (TDLM and PSOM) were developed to predict the optimized minimum operating time for the adsorption of Pb(2+) onto PVA-modified Kaolinite clay in a two-stage batch adsorber system. Results obtained suggest that the two-stage batch adsorber process leads to improved contact time and increased percentage Pb(2+) removal. Data from both models (TDLM and PSOM) were compared using t-test and F-test and were found to be precise enough for use in the optimization of kinetic data for a two-stage adsorption of Pb(2+) ions from aqueous solution.
authors.affiliation: Department of Chemical Sciences, College of Natural Sciences, Redeemer's University, Redemption City, Ogun State, Nigeria. iyaemma@yahoo.com <iyaemma@yahoo.com>
authors.forename: E I
authors.initials: EI
authors.lastname: Unuabonah
authors.forename: B I
authors.initials: BI
authors.lastname: Olu-Owolabi
authors.forename: D
authors.initials: D
authors.lastname: Okoro
authors.forename: K O
authors.initials: KO
authors.lastname: Adebowale
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates; D000077215:Clay; D007477:Ions; D007616:Kaolin / Q000737:chemistry*; D007700:Kinetics; D007854:Lead / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification*; D008670:Metals; D015233:Models, Statistical; D011142:Polyvinyl Alcohol / Q000737:chemistry; D012044:Regression Analysis; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D000538:Aluminum Silicates; D007477:Ions; D008670:Metals; D014874:Water Pollutants, Chemical; D007616:Kaolin; D007854:Lead; D011142:Polyvinyl Alcohol; D000077215:Clay