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Chandrasekar A, Ghanty TK, Brahmmananda Rao CVS, Sundararajan M, Sivaraman N. Strong influence of weak hydrogen bonding on actinide-phosphonate complexation: accurate predictions from DFT followed by experimental validation. Phys Chem Chem Phys 2019; 21:5566-5577. [PMID: 30785454 DOI: 10.1039/c9cp00479c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Among the varied classes of weak hydrogen bond, the CHO type is one of immense interest as it governs the finer structures of biological and chemical molecules, hence determining their functionalities. In the present work, this weak hydrogen bond has been shown to strongly influence the complexation behaviour of uranyl nitrate [UO2(NO3)2] with diamyl-H-phosphonate (DAHP) and its branched isomer disecamyl-H-phosphonate (DsAHP). The structures of the bare ligands and complexes have been optimized by density functional theory (DFT) calculations. Surprisingly, despite having the same chemical composition the branched UO2(NO3)2·2DsAHP complex shows a remarkably higher stability (by ∼14 kcal mol-1) compared to the UO2(NO3)2·2DAHP complex. Careful inspection of the optimized structures reveals the existence of multiple CHO hydrogen-bonding interactions between the nitrate oxygens or U[double bond, length as m-dash]O oxygens and the α-hydrogens in the alkyl chains of the ligands. Comparatively stronger such bonds are found in the UO2(NO3)2·2DsAHP complex. The binding free energies associated with the complexes are computed and favoured superior binding energetics for the more stable UO2(NO3)2·2DsAHP complex. Calculations involving diisoamyl-H-phosphonate (DiAHP) and its complexes have also been performed. Theoretical predictions are experimentally tested by carrying out the extraction of U(vi) from nitric acid media using these ligands. DAHP, DsAHP and DiAHP are synthesised, characterised by NMR and evaluated for their physicochemical properties viz. viscosity, density and aqueous solubility. It was experimentally discovered that indeed DsAHP complexation with uranyl nitrate is more favoured. H-phosphonates are generically classified as acidic extractants owing to the formation of an enol tautomer at lower acidities, hence complexing the metal ion by proton exchange. Our experiments interestingly reveal a neutral ligand characteristic for DsAHP alone which is generically an acidic extractant. Furthermore, the enol tautomer of H-phosphonates that governs their extraction profiles at low acidities is also explored by DFT and the anomalous pH dependent complexation trend of DsAHP could be successfully explained. The extractions of Pu(iv) and Th(iv) have also been carried out in addition to U(vi). Solvent extraction behaviour of Am(iii) was also studied with all three ligands; the positive binding energies computed for the Am(iii) complexation corroborate with our experimental results on the poor extraction of Am(iii).
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Affiliation(s)
- Aditi Chandrasekar
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu 603102, India.
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Earl LD, Do C, Wang Y, Abney CW. Polyamidoxime chain length drives emergent metal-binding phenomena. Phys Chem Chem Phys 2019; 21:554-560. [PMID: 30288536 DOI: 10.1039/c8cp02198h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Emergence is complex behavior arising from the interactions of many simple constituents that do not display such behavior independently. Polyamidoxime (PAO) uranium adsorbents show such phenomena, as recent works articulate that the polymer binds uranium differently than the monomeric constituents. In order to investigate the origins of this emergent uranium-binding behavior, we synthesized a series of amidoxime polymers with low polydispersity and small molecules with lengths ranging from 1 to 125 repeat units. Following immersion in a uranyl-containing solution, the local, intermediate, and macroscopic structures were investigated by X-ray absorption fine structure (XAFS) spectroscopy, small angle neutron scattering (SANS), and dynamic light scattering (DLS). Fits of the extended XAFS (EXAFS) region revealed a progressive change in uranium coordination environment as a function of polymer molecular weight, identifying chain length as a driving force in emergent metal binding and resolving the controversy over how amidoxime adsorbents bind uranium.
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Affiliation(s)
- L D Earl
- Chemical Sciences Division, Physical Sciences Directorate, Oak Ridge National Laboratory, One Bethel Valley Road, P.O. Box 2008, Oak Ridge, TN 37831, USA.
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Poly(amidoxime) functionalized MoS2 for efficient adsorption of uranium(VI) in aqueous solutions. J Radioanal Nucl Chem 2018. [DOI: 10.1007/s10967-018-6338-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Shao D, Wang X, Ren X, Hu S, Wen J, Tan Z, Xiong J, Asiri AM, Marwani HM. Polyamidoxime functionalized with phosphate groups by plasma technique for effective U(VI) adsorption. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.07.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kuo L, Gill GA, Tsouris C, Rao L, Pan H, Wai CM, Janke CJ, Strivens JE, Wood JR, Schlafer N, D'Alessandro EK. Temperature Dependence of Uranium and Vanadium Adsorption on Amidoxime‐Based Adsorbents in Natural Seawater. ChemistrySelect 2018. [DOI: 10.1002/slct.201701895] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Li‐Jung Kuo
- Marine Sciences Laboratory Pacific Northwest National Laboratory Sequim WA 98382 USA
| | - Gary A. Gill
- Marine Sciences Laboratory Pacific Northwest National Laboratory Sequim WA 98382 USA
| | | | - Linfeng Rao
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Horng‐Bin Pan
- Department of Chemistry University of Idaho Moscow ID 83844 USA
| | - Chien M. Wai
- Department of Chemistry University of Idaho Moscow ID 83844 USA
| | | | - Jonathan E. Strivens
- Marine Sciences Laboratory Pacific Northwest National Laboratory Sequim WA 98382 USA
| | - Jordana R. Wood
- Marine Sciences Laboratory Pacific Northwest National Laboratory Sequim WA 98382 USA
| | - Nicholas Schlafer
- Marine Sciences Laboratory Pacific Northwest National Laboratory Sequim WA 98382 USA
| | - Evan K. D'Alessandro
- Rosensteil School of Marine and Atmospheric Chemistry University of Miami Miami FL 33149 USA
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Abney CW, Mayes RT, Saito T, Dai S. Materials for the Recovery of Uranium from Seawater. Chem Rev 2017; 117:13935-14013. [DOI: 10.1021/acs.chemrev.7b00355] [Citation(s) in RCA: 428] [Impact Index Per Article: 61.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Carter W. Abney
- Chemical Sciences Division, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
| | - Richard T. Mayes
- Chemical Sciences Division, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
| | - Tomonori Saito
- Chemical Sciences Division, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
| | - Sheng Dai
- Chemical Sciences Division, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
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Ivanov AS, Leggett CJ, Parker BF, Zhang Z, Arnold J, Dai S, Abney CW, Bryantsev VS, Rao L. Origin of the unusually strong and selective binding of vanadium by polyamidoximes in seawater. Nat Commun 2017; 8:1560. [PMID: 29146970 PMCID: PMC5691157 DOI: 10.1038/s41467-017-01443-1] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 09/19/2017] [Indexed: 11/09/2022] Open
Abstract
Amidoxime-functionalized polymeric adsorbents are the current state-of-the-art materials for collecting uranium (U) from seawater. However, marine tests show that vanadium (V) is preferentially extracted over U and many other cations. Herein, we report a complementary and comprehensive investigation integrating ab initio simulations with thermochemical titrations and XAFS spectroscopy to understand the unusually strong and selective binding of V by polyamidoximes. While the open-chain amidoxime functionalities do not bind V, the cyclic imide-dioxime group of the adsorbent forms a peculiar non-oxido V5+ complex, exhibiting the highest stability constant value ever observed for the V5+ species. XAFS analysis of adsorbents following deployment in environmental seawater confirms V binding solely by the imide-dioximes. Our fundamental findings offer not only guidance for future optimization of selectivity in amidoxime-based sorbent materials, but may also afford insight to understanding the extensive accumulation of V in some marine organisms.
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Affiliation(s)
| | - Christina J Leggett
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.,U. S. Nuclear Regulatory Commission, Rockville, MD, 20852, USA
| | - Bernard F Parker
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.,University of California-Berkeley, Berkeley, CA, 94720, USA
| | - Zhicheng Zhang
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - John Arnold
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.,University of California-Berkeley, Berkeley, CA, 94720, USA
| | - Sheng Dai
- Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Carter W Abney
- Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
| | | | - Linfeng Rao
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
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Dolgopolova EA, Ejegbavwo OA, Martin CR, Smith MD, Setyawan W, Karakalos SG, Henager CH, zur Loye HC, Shustova NB. Multifaceted Modularity: A Key for Stepwise Building of Hierarchical Complexity in Actinide Metal–Organic Frameworks. J Am Chem Soc 2017; 139:16852-16861. [DOI: 10.1021/jacs.7b09496] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Ekaterina A. Dolgopolova
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Otega A. Ejegbavwo
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Corey R. Martin
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Mark D. Smith
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Wahyu Setyawan
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Stavros G. Karakalos
- College
of Engineering and Computing, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Charles H. Henager
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Hans-Conrad zur Loye
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Natalia B. Shustova
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
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Shao D, Li Y, Wang X, Hu S, Wen J, Xiong J, Asiri AM, Marwani HM. Phosphate-Functionalized Polyethylene with High Adsorption of Uranium(VI). ACS OMEGA 2017; 2:3267-3275. [PMID: 31457652 PMCID: PMC6641584 DOI: 10.1021/acsomega.7b00375] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 05/15/2017] [Indexed: 05/12/2023]
Abstract
For uranium extraction from seawater, development of new stable and reusable sorbents with high affinity and good selectivity for U(VI) is required. Herein, a new phosphate-functionalized polyethylene (denoted PO4/PE) was synthesized via a simple Ar-jet plasma treatment of PE in concentrated H3PO4 and was employed in U(VI) extraction from seawater. The prepared PO4/PE shows superior performance in the extraction of trace U(VI) from seawater. The adsorption process followed the second-order kinetics model and the Langmuir model. The maximum adsorption capacity of PO4/PE for U(VI) reaches 173.8 mg/g at pH 8.2 and 298 K. PO4/PE can be effectively regenerated by 0.1 mol/L Na2CO3 and reused well even after eight cycles. Experimental results offer a new approach for U(VI) uptake from seawater.
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Affiliation(s)
- Dadong Shao
- Institute
of Nuclear Physics and Chemistry, China
Academy of Engineering Physics, No. 64 Mianshan Road, Mianyang 621900, P. R. China
| | - Yuying Li
- School
of Chemistry & Environmental Engineering, Wuyi University, No.
2 Dongcheng Road, Jiangmen 529020, P. R. China
| | - Xiaolin Wang
- Institute
of Nuclear Physics and Chemistry, China
Academy of Engineering Physics, No. 64 Mianshan Road, Mianyang 621900, P. R. China
- E-mail: (X.W.)
| | - Sheng Hu
- Institute
of Nuclear Physics and Chemistry, China
Academy of Engineering Physics, No. 64 Mianshan Road, Mianyang 621900, P. R. China
- E-mail: (S.H.)
| | - Jun Wen
- Institute
of Nuclear Physics and Chemistry, China
Academy of Engineering Physics, No. 64 Mianshan Road, Mianyang 621900, P. R. China
| | - Jie Xiong
- Institute
of Nuclear Physics and Chemistry, China
Academy of Engineering Physics, No. 64 Mianshan Road, Mianyang 621900, P. R. China
| | - Abdullah M. Asiri
- Chemistry
Department, Faculty of Science, King Abdulaziz
University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Hadi M. Marwani
- Chemistry
Department, Faculty of Science, King Abdulaziz
University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
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Abney CW, Do C, Luo H, Wright J, He L, Dai S. Controlling the Intermediate Structure of an Ionic Liquid for f-Block Element Separations. J Phys Chem Lett 2017; 8:2049-2054. [PMID: 28423277 DOI: 10.1021/acs.jpclett.7b00755] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recent research has revealed molecular structure beyond the inner coordination sphere is essential in defining the performance of separation processes; nevertheless, such structure remains largely unexplored. Here we apply small-angle neutron scattering (SANS) and X-ray absorption fine structure (XAFS) spectroscopy to investigate the structure of an ionic liquid system studied for f-block element separations. SANS data reveal dramatic changes in the ionic liquid microstructure (∼150 Å) which we demonstrate can be controlled by judicious selection of counterion. Mesoscale structural features (>500 Å) are also observed as a function of metal concentration. XAFS analysis supports formation of extended aggregate structures, similar to those observed in traditional solvent extraction processes, and suggests additional parallels may be drawn from further study. Achieving precise tunability over the intermediate features is an important development in controlling mesoscale structure and realizing advanced new forms of soft matter.
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Affiliation(s)
- Carter W Abney
- Oak Ridge National Laboratory , One Bethel Valley Road, P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
| | - Changwoo Do
- Biology and Soft Matter Division, Neutron Sciences Directorate, Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
| | - Huimin Luo
- Oak Ridge National Laboratory , One Bethel Valley Road, P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
| | - Joshua Wright
- Advanced Photon Source, Argonne National Laboratory , 9700 Cass Avenue, Lemont, Illinois 60439, United States
- Illinois Institute of Technology , 3300 South Federal Street, Chicago, Illinois 60616, United States
| | - Lilin He
- Biology and Soft Matter Division, Neutron Sciences Directorate, Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
| | - Sheng Dai
- Oak Ridge National Laboratory , One Bethel Valley Road, P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37966, United States
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11
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Li B, Sun Q, Zhang Y, Abney CW, Aguila B, Lin W, Ma S. Functionalized Porous Aromatic Framework for Efficient Uranium Adsorption from Aqueous Solutions. ACS APPLIED MATERIALS & INTERFACES 2017; 9:12511-12517. [PMID: 28350432 DOI: 10.1021/acsami.7b01711] [Citation(s) in RCA: 135] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We demonstrate the successful functionalization of a porous aromatic framework for uranium extraction from water as exemplified by grafting PAF-1 with the uranyl chelating amidoxime group. The resultant amidoxime-functionalized PAF-1 (PAF-1-CH2AO) exhibits a high uranium uptake capacity of over 300 mg g-1 and effectively reduces the uranyl concentration from 4.1 ppm to less than 1.0 ppb in aqueous solutions within 90 min, well below the acceptable limit of 30 ppb set by the US Environmental Protection Agency. The local coordination environment of uranium in PAF-1-CH2AO is revealed by X-ray absorption fine structure spectroscopic studies, which suggest the cooperative binding between UO22+ and adjacent amidoxime species.
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Affiliation(s)
- Baiyan Li
- Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States
| | - Qi Sun
- Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States
| | - Yiming Zhang
- Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States
| | - Carter W Abney
- Department of Chemistry, University of Chicago , 929 East 57th St., Chicago, Illinois 60637, United States
- Chemical Sciences Division, Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
| | - Briana Aguila
- Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States
| | - Wenbin Lin
- Department of Chemistry, University of Chicago , 929 East 57th St., Chicago, Illinois 60637, United States
| | - Shengqian Ma
- Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States
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