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Items for "Uranyl"

Theoretical first step towards an understanding of the uranyl ion sorption on the rutile TiO₂(110) face: A DFT periodic and cluster study

First results of a periodic and cluster Density Functional Theory (DFT) study of the uranyl ion (UO₂²⁺) sorption onto the rutile TiO₂(110) face, based on plane wave and localised basis sets, are presented...

Keywords: Sorption, Uranyl, DFT, Rutile(110), Periodic

09/2006 | Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Interaction of U(VI) with pyrite, galena and their mixtures: a theoretical and multitechnique approach

Pyrite and/or galena particles previously conditioned with U(VI) at pH 6 have been characterized by micro-Raman spectrometry, voltammetry, scanning electron microscopy and high resolution X-ray photoelectron spectroscopy...

Keywords: Uranyl, Pyrite, Galena, Sulphides mixture, Galvanic interactions

09/2006 | Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Surface complexation modelling of uranyl adsorption onto kaolinite based clay minerals using FITEQL 3.2

The aim of this study is to explain how the kaolinite-based clay minerals adsorb hexavalent uranium (uranyl ion), and to model uranyl adsorption based on inner-sphere surface complexation with the kaolinite edge hydroxyl sites and outer-sphere complexation with the permanent charge sites...

Keywords: Uranium(VI), Uranyl, Clay, Kaolinite, Adsorption

12/2006 | Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Complexation of uranium(VI) with aromatic acids in aqueous solution – a comparison of hydroxamic acids and benzoic acid

The complex formation of uranium(VI) with salicylhydroxamic,
benzohydroxamic, and benzoic acid in 0.1 M NaClO₄ was studied by UV-vis spectroscopy at pH 3 and 4...

Keywords: Uranyl, Hydroxamic acid, Spectroscopy, UV-vis spectra, Complexation

03/2007 | Radiochimica Acta, Oldenbourg Wissenschaftsverlag

A new time-resolved laser-induced fluorescence spectrometry (TRLFS) data acquisition procedure applied to the uranyl-phosphate system

TRLFS has been used to study the U^VIO₂²⁺-PO₄^3- system, in the 1 to 5 pH range, for [PO₄^3-]=2×10^-3 to 1.02×10^-1 M range and [UO₂²⁺]=1.2×10^-5 M...

Keywords: TRLFS, Uranyl, Phosphate, Speciation, Multi-exponential decays