Organoclay modified with lignin as a new adsorbent for removal of Pb2+ and UO2
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Authors: | Selçuk ?im?ek Demet Bayba? Muzaffer Ça?r? Koçyi?it Hatice Y?ld?r?m |
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Institution: | 1. Department of Chemistry, Cumhuriyet University, Sivas, Turkey
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Abstract: | This study investigated a new adsorbent prepared from lignin modified organoclay for the removal of Pb2+ and UO2 2+ from aqueous solutions. The characterization of new adsorbent was performed by FT-IR and XRD. Adsorption of Pb2+ and UO2 2+ species in aqueous solution as a function of ion concentration, pH, temperature and time of adsorption was investigated in detail. The adsorption data were analyzed by using the Langmuir, Freundlich and Dubinin-Radushkevich models. The monolayer adsorption capacities of organoclay–lignin were 0.12 mol kg?1 and 0.42 mol kg?1 for Pb2+ and UO2 2+, respectively. The experimental kinetic data were analyzed by using pseudo-second-order kinetic and intra-particle diffusion models. The proposed adsorption mechanism follows a pseudo-second-order kinetic and endothermic because of increasing disorderliness at adsorbate/adsorbent interface. |
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