Near edge X-ray absorption fine structure (NEXAFS) of model compounds for the humic acid/actinide ion interaction |
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| Institution: | 1. Department of Physics, Southern Federal University, 5 Zorge Street, 344090 Rostov-on-Don, Russia;2. Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;1. Charles Sturt University, POB 883, Orange, NSW 2800, Australia;2. Physical Chemistry Department, Ruđer Bošković Institute, HR-10002 Zagreb, Croatia;3. Louisiana State University, Baton Rouge, LA 70803, USA;1. Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan;2. International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan;1. Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, PR China;2. School of Renewable Energy, North China Electric Power University, Beijing 102206, PR China;3. Hefei National Laboratory for Physical Sciences at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China (USTC), Hefei 230026, PR China |
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| Abstract: | To understand spectral features of humic acid (HA) C 1s-near edge X-ray absorption fine structure (NEXAFS) with and without metal ion complexation, a set of model compounds is investigated. Halogenated benzoic acids and anthranilic acid are examined to demonstrate the effect of electron withdrawing groups on the C 1s-NEXAFS spectra of complex organic acids, including HA. The peak positions for aromatic and carboxylic groups in these spectra are in agreement with common assignments. The spectral position of the peak for substituted aromatic carbon shifts with increasing electronegativity of the substituent to higher photon energies. Polyacrylic acid (PAA) and different PAA metal ion complexes are investigated as model substances for metal cation complexation by HA. Tb(III)-, Zr(IV)- and U(VI)–PAA exhibit general spectral signatures previously observed for the PAA/Eu(III)–PAA system. For these different metal cations, similar spectral changes and distinct variations in peak intensities are observed going from the uncomplexed to the metal-loaded macromolecules. These spectral changes are comparable to those for U(VI)- and Th(IV)–HA systems. |
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