title: Lead sorption by waste biomass of hazelnut and almond shell.
abstract: The potential to remove Pb(2+) ion from aqueous solutions using the shells of hazelnut (HNS) (Corylus avellana) and almond (AS) (Prunus dulcis) through biosorption was investigated in batch experiments. The main parameters influencing Pb(2+) ion sorption on HNS and AS were: initial metal ion concentration, amount of adsorbent, contact time and pH value of solution. The influences of initial Pb(2+) ion concentration (0.1-1.0mM), pH (2-9), contact time (10-240 min) and adsorbent amount (0.1-1.0 g) have been investigated. Equilibrium isotherms have been measured and modelled. Adsorption of Pb(2+) ions was in all cases pH-dependent showing a maximum at equilibrium pH values between 6.0 and 7.0, depending on the biomaterial, that corresponded to equilibrium pH values of 6.0 for HNS and 7.0 for AS. The equilibrium sorption capacities of HNS and AS were 28.18 and 8.08 mg/g for lead, respectively after equilibrium time of 2h. The adsorption data fit well with the Langmuir isotherm model and the experimental result inferred that adsorption, chelation and ion exchange are major adsorption mechanisms for binding Pb(2+) ion to the sorbents.
authors.affiliation: Department of Chemical Engineering, Selcuk University, Campus, Konya, Turkey. erolpehlivan@gmail.com
authors.forename: Erol
authors.initials: E
authors.lastname: Pehlivan
authors.forename: Türkan
authors.initials: T
authors.lastname: Altun
authors.forename: Serpil
authors.initials: S
authors.lastname: Cetin
authors.forename: M
authors.initials: M
authors.lastname: Iqbal Bhanger
mesh_terms: D000327:Adsorption; D018533:Biomass; D002614:Chelating Agents; D031211:Corylus; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007474:Ion Exchange; D007854:Lead / Q000302:isolation & purification*; D027861:Prunus
chemical_list: D002614:Chelating Agents; D007220:Industrial Waste; D007854:Lead