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


Şimşek S. , Baybaş D. , Kocyigit M. C. , Yıldırım H.

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol.299, pp.283-292, 2014 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 299
  • Publication Date: 2014
  • Doi Number: 10.1007/s10967-013-2754-x
  • Title of Journal : JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
  • Page Numbers: pp.283-292

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.