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

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

Source: Applied Spectroscopy, Volume 46, Issue 7, Pages 1085-1202 (July 1992) , pp. 1168-1175(8)

Publisher: Society for Applied Spectroscopy

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Abstract:

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

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702924124178

Affiliations: 1: Department of Chemistry, New Mexico State University, Las Cruces, New Mexico 88003

Publication date: 1992-07-01

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