Abstract

A pulsed tunable dye laser has been used to obtain the emission spectra and fluorescence decay curves of solid UO²⁺₂-<i>Datura innoxia</i> and a series of UO²⁺₂-containing complexes at liquid nitrogen temperature. The decay curves of UO²⁺₂-<i>Datura</i> exhibited a bi-exponential decay, suggesting that at least two different binding sites are present on the walls of nonliving <i>D. innoxia</i> cells. The model solutions containing carboxyl, amine, hydroxyl, phosphoryl, sulfate, and sulfonate functionalities have been utilized to identify the functionalities involving in the binding of UO²⁺₂ to nonliving <i>D. innoxia</i> cell walls. Phosphoryl and dicarboxyl groups have beer demonstrated to be the dominant functional groups responsible for the binding of uranyl ions on <i>D. innoxia</i> cell walls.

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