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Investigation of UO2+2 Binding Sites on Datura innoxia Using UO2+2 Luminescence

Volume 46, Number 7 (July 1992) Page 1168-1175

Ke, Huei-Yang David; Rayson, Gary D.

A pulsed tunable dye laser has been used to obtain the emission spectra and fluorescence decay curves of solid UO2+2-Datura innoxia and a series of UO2+2-containing complexes at liquid nitrogen temperature. The decay curves of UO2+2-Datura exhibited a bi-exponential decay, suggesting that at least two different binding sites are present on the walls of nonliving D. innoxia 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 D. innoxia cell walls. Phosphoryl and dicarboxyl groups have beer demonstrated to be the dominant functional groups responsible for the binding of uranyl ions on D. innoxia cell walls.