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

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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.

Keywords: Biomass material; Fluorescence emission spectra; Fluorescence lifetime; Laser-induced fluorescence; Luminescence spectral analysis; Uranyl luminescence

Document Type: Research Article


Affiliations: Department of Chemistry, New Mexico State University, Las Cruces, New Mexico 88003

Publication date: July 1, 1992

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