Organoclay modified with lignin as a new adsorbent for removal of Pb2+ and UO2 (2+)


ŞİMŞEK S. , BAYBAŞ D. , Kocyigit M. C. , YILDIRIM H.

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, cilt.299, ss.283-292, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 299 Konu: 1
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1007/s10967-013-2754-x
  • Dergi Adı: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
  • Sayfa Sayıları: ss.283-292

Özet

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.