Abstract
Zirconia powder was synthesized via sol gel method and used for erbium sorption. The adsorption is strongly dependent on pH of the medium where the removal efficiency increases as the pH turns to alkaline range. The process was very fast initially and maximum adsorption was attained within 60 min of contact. Pseudo-second-order model and homogeneous particle diffusion model (HPDM) was found to be the best to correlate the diffusion of erbium into zirconia particles. Adsorption thermodynamic parameters were calculated. Erbium adsorption is an endothermic (?H > 0) and good affinity of erbium ions towards the zirconia (?S > 0).
Highlights
Zirconia powder was synthesized via sol gel method and used for erbium sorption
The highest removal efficiency of zirconia for erbium ion was obtained at pH 5.0
The adsorption can be explained as ion exchange mechanism between erbium ion and hydroxyl groups
Summary
Zirconia powder was synthesized via sol gel method and used for erbium sorption. The adsorption is strongly dependent on pH of the medium where the removal efficiency increases as the pH turns to alkaline range. A good deal of interest has grown in the last decades in the application of inorganic ion-exchangers in nuclear technology due to their high mechanical, chemical and radiation stabilities, granulometric properties suitable for column operation and high ionexchange capacity and adsorption efficiency [5]. Among these materials, metal oxides are a group of inorganic ion exchangers that has been investigated extensively in the treatment of radioactive waste [6]. Adsorption kinetics and thermodynamics of erbium adsorption by sol–gel-derived zirconia from aqueous solutions were studied
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