13-18 May 2018
Casino Conference Centre
Europe/Prague timezone

Uranium(VI) binding by pine needles prior and after chemical modification

14 May 2018, 17:15
1h 30m
Gallery (Casino Conference Centre)

Gallery

Casino Conference Centre

Poster Separation Methods, Speciation Poster SEP

Speaker

Katerina Philippou

Description

Adsorption of uranium(IV) by pine needles prior and after carbonization and following surface oxidation has been investigated by batch-type experiments as a function of various parameters (e.g. pH, [U(VI)]ο, I, T), and the adsorbents were characterized by FTIR and SEM measurements. The experimental data have been well fitted by the Langmuir adsorption isotherm and the highest adsorption efficiency is observed for the carbonized and surface oxidized material (qmax= 1.15 mol·kg-1 at pH 3), followed by the non-treated pine needles (qmax= 0.28 mol·kg-1 at pH 3) and the carbonized material (qmax= 0.12 mol·kg-1 at pH 3). The highest U(VI) adsorption observed after surface oxidation of the carbonized material is attributed to the presence of carboxylic moieties, which possess increased affinity for the U(VI) cations and form inner-sphere surface complexes.

Primary author

Co-authors

Mrs Ioanna Savva (Department of Mechanical and Manufacturing Engineering, University of Cyprus) Ioannis Pashalidis (Department of Chemistry, University of Cyprus)

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