Studies of equilibrium and kinetics of adsorption of cesium ions by graphene oxide


Cesium is one of the fission products of major radiological concern, it is often found in nuclear radioactive waste generated at nuclear power plants. Graphene Oxide (GO) has attracted great attention due to its functionalized surface, which includes hydroxyl, epoxy, carbonyl and carboxyl groups, with great capacity of complexation with metal ions and can be used as adsorbent to remove cations from aqueous solutions. In this work, a treatment of radioactive waste containing 137Cs was studied. For the batch experiments of Cs+ removal, 133Cs concentrations remained after the adsorption were determined by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) and the results obtained were analyzed according to the Langmuir and Freundlich isotherms models. The kinetics of adsorption and Gibbs free energy were also determined. The Langmuir model was the best fit and defined a favorable adsorption. The cesium adsorption process is the pseudo-second model and the Gibbs free energy calculation indicated that the adsorption process is spontaneous.

OLIVEIRA, Fernando M.; BUENO, Vanessa N.; OSHIRO, Maurício T.; POTIENS JR., Ademar J.; HIROMOTO, Goro; RODRIGUES, Debora F.; SAKATA, Solange K. Studies of equilibrium and kinetics of adsorption of cesium ions by graphene oxide. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE-INAC, 2017, Belo Horizonte. Papers… 6 p.

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