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Exploring Uranyl/Salicylate/Hematite Binary and Ternary Complexes by Attenuated‐Total‐Reflection Infrared Spectroscopy
Author(s) -
Ren Yiming,
Wu Qian,
Zhong Jingrong,
Qin Zhen,
Shao Lang,
Tang Hao,
Kong Chuipeng,
Li Yingru
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800066
Subject(s) - uranyl , chemistry , hematite , inorganic chemistry , adsorption , infrared spectroscopy , ternary operation , humic acid , desorption , maghemite , sorption , ternary complex , attenuated total reflection , organic chemistry , mineralogy , computer science , programming language , fertilizer , enzyme , ion
Attenuated‐total‐reflection infrared technique was utilized to investigate the binding mechanisms in uranyl/salicylate/hematite binary and ternary systems at the molecular scale. Uranyl has been found to adsorb onto hematite surfaces in an outer‐sphere mode, similar to uranyl/maghemite system, whereas the desorption process is much longer than the latter which is probably due to different surface structures of the two minerals. Salicylate, as a good analogue of humic acid and other ortho‐hydroxo aromatic acids, binds with the surface mainly through complexation of the carboxylic group with the surface. In the cosorption system of uranyl/salicylate, at a sub‐micromolar concentration onto hematite, only weak interactions are deduced from the shifts of salicylate characteristic peaks. The increasing amount of salicylate have significant influences upon uranyl species and would release uranyl from the surface. The ternary complexes were found for both systems, and the possible structures were predicted through DFT calculations. The results of the present study could provide some information on the organic ligand influences on the uranyl sorption process, especially for the ortho‐hydroxo acromatic acids, such as humic acid.