1
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Flosbach NT, Bykov M, Bykova E, Rasche B, Mezouar M, Fedotenko T, Chariton S, Prakapenka VB, Wickleder MS. Stabilization of Pr 4+ in Silicates─High-Pressure Synthesis of PrSi 3O 8 and Pr 2Si 7O 18. Inorg Chem 2024; 63:4875-4882. [PMID: 38412505 DOI: 10.1021/acs.inorgchem.3c03948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
The reaction between PrO2 and SiO2 was investigated at various pressure points up to 29 GPa in a diamond anvil cell using laser heating and in situ single-crystal structure analysis. The pressure points at 5 and 10 GPa produced Pr2III(Si2O7), whereas Pr4IIISi3O12 and Pr2IV(O2)O3 were obtained at 15 GPa. Pr4IIISi3O12 can be interpreted as a high-pressure modification of the still unknown orthosilicate Pr4III(SiO4)3. PrIVSi3O8 and Pr2IVSi7O18 that contain praseodymium in its rare + IV oxidation state were identified at 29 GPa. After the pressure was released from the reaction chamber, the Pr(IV) silicates could be recovered, indicating that they are metastable at ambient pressure. Density functional theory calculations of the electronic structure corroborate the oxidation state of praseodymium in both PrIVSi3O8 and Pr2IVSi7O18. Both silicates are the first structurally characterized representatives of Pr4+-containing salts with oxoanions. All three silicates contain condensed networks of [SiO6] octahedra which is unprecedented in the rich chemistry of lanthanoid silicates.
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Affiliation(s)
- Niko T Flosbach
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Maxim Bykov
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
- Institute of Inorganic and Analytical Chemistry, Goethe University Frankfurt, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Elena Bykova
- Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
| | - Bertold Rasche
- Institute of Inorganic Chemistry, University of Stuttgart, 70569 Stuttgart, Germany
| | - Mohamed Mezouar
- European Synchrotron Radiation Facility (ESRF), Avenue des Martyrs 71, 38000 Grenoble, France
| | - Timofey Fedotenko
- Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany
| | - Stella Chariton
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, United States
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, United States
| | - Mathias S Wickleder
- Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
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2
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Ayub MA, Zia Ur Rehman M, Ahmad HR, Fox JP, Clubb P, Wright AL, Anwar-Ul-Haq M, Nadeem M, Rico CM, Rossi L. Influence of ionic cerium and cerium oxide nanoparticles on Zea mays seedlings grown with and without cadmium. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 322:121137. [PMID: 36720342 DOI: 10.1016/j.envpol.2023.121137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 01/16/2023] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
Cerium (Ce4+) and cerium oxide nanoparticles (CeO2-NPs) have diversified reported effects on plants. Once dispersed in the environment their fate is not well understood, especially in co-existence with other pollutants like cadmium (Cd). The effect of co-application of Ce and Cd are reported in various studies, but the role of Ce source (ionic or bulk) and nanoparticle size is still unknown in cereal plants like maize (Zea mays). To better understand the synergistic effects of Ce and Cd, 500 mg kg-1 Ce coming from ionic (Ce4+ as CeSO4) and CeO2 nano sources (10 nm, 50 nm, and 100 nm) alone and in combination with 0.5 mg Cd kg-1 sand were applied to maize seedlings. Growth, physiology, root structure, anatomy, and ionic homeostasis in maize were measured. The results revealed that Ce4+ resulted in overall decrease in seedling growth, biomass and resulted in higher heavy metal (in control sets) and Cd (in Cd spiked sets) uptake in maize seedlings' root and shoot. The effects of CeO2-NPs were found to be dependent on particle size; in fact, under Cd-0 (non-Cd spiked sets) CeO2-100 nm showed beneficial effects compared to the control. While under co-application with Cd, CeO2-50 nm showed net beneficial effects on maize seedling growth parameters. The Ce alone, and in combination with Cd, altered the root suberin barrier formation. Both ionic and nano Ce sources alone and in co-existence with Cd behaved differently for tissue elemental concentrations (Ce, Cd, micronutrients like B, Mn, Ni, Cu, Zn, Mo, Fe and elements Co, Si) suggesting a strong influence of Cd-Ce coexistence on the element's uptake and translocation in maize.
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Affiliation(s)
- Muhammad Ashar Ayub
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan; Indian River Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA; Institute of Agro-Industry and Environment, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur, 63100, Punjab, Pakistan
| | - Muhammad Zia Ur Rehman
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan
| | - Hamaad Raza Ahmad
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan
| | - John-Paul Fox
- Indian River Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA
| | - Preston Clubb
- Department of Chemistry and Biochemistry, Missouri State University, 901 S National Ave, Springfield, MO, 65897, USA
| | - Alan L Wright
- Indian River Research and Education Center, Soil, Water, and Ecosystem Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA
| | - Muhammad Anwar-Ul-Haq
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan
| | - Muhammad Nadeem
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan; Indian River Research and Education Center, Soil, Water, and Ecosystem Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA; Institute of Agro-Industry and Environment, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur, 63100, Punjab, Pakistan
| | - Cyren M Rico
- Department of Chemistry and Biochemistry, Missouri State University, 901 S National Ave, Springfield, MO, 65897, USA
| | - Lorenzo Rossi
- Indian River Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA.
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3
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Buchanan C, Herrera D, Balasubramanian M, Goldsmith BR, Singh N. Unveiling the Cerium(III)/(IV) Structures and Charge-Transfer Mechanism in Sulfuric Acid. JACS AU 2022; 2:2742-2757. [PMID: 36590268 PMCID: PMC9795571 DOI: 10.1021/jacsau.2c00484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 09/28/2022] [Accepted: 10/05/2022] [Indexed: 06/17/2023]
Abstract
The Ce3+/Ce4+ redox couple has a charge transfer (CT) with extreme asymmetry and a large shift in redox potential depending on electrolyte composition. The redox potential shift and CT behavior are difficult to understand because neither the cerium structures nor the CT mechanism are well understood, limiting efforts to improve the Ce3+/Ce4+ redox kinetics in applications such as energy storage. Herein, we identify the Ce3+ and Ce4+ structures and CT mechanism in sulfuric acid via extended X-ray absorption fine structure spectroscopy (EXAFS), kinetic measurements, and density functional theory (DFT) calculations. We show EXAFS evidence that confirms that Ce3+ is coordinated by nine water molecules and suggests that Ce4+ is complexed by water and three bisulfates in sulfuric acid. Despite the change in complexation within the first coordination shell between Ce3+ and Ce4+, we show that the kinetics are independent of the electrode, suggesting outer-sphere electron-transfer behavior. We identify a two-step mechanism where Ce4+ exchanges the bisulfate anions with water in a chemical step followed by a rate-determining electron transfer step that follows Marcus theory (MT). This mechanism is consistent with all experimentally observed structural and kinetic data. The asymmetry of the Ce3+/Ce4+ CT and the observed shift in the redox potential with acid is explained by the addition of the chemical step in the CT mechanism. The fitted parameters from this rate law qualitatively agree with DFT-predicted free energies and the reorganization energy. The combination of a two-step mechanism with MT should be considered for other metal ion CT reactions whose kinetics have not been appropriately described.
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Affiliation(s)
- Cailin
A. Buchanan
- Department
of Chemical Engineering, University of Michigan-Ann
Arbor, Ann Arbor, Michigan48109, United
States
- Catalysis
Science and Technology Institute, University
of Michigan-Ann Arbor, Ann Arbor, Michigan48109, United States
| | - Dylan Herrera
- Department
of Chemical Engineering, University of Michigan-Ann
Arbor, Ann Arbor, Michigan48109, United
States
- Catalysis
Science and Technology Institute, University
of Michigan-Ann Arbor, Ann Arbor, Michigan48109, United States
| | - Mahalingam Balasubramanian
- Advanced
Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois60439, United States
| | - Bryan R. Goldsmith
- Department
of Chemical Engineering, University of Michigan-Ann
Arbor, Ann Arbor, Michigan48109, United
States
- Catalysis
Science and Technology Institute, University
of Michigan-Ann Arbor, Ann Arbor, Michigan48109, United States
| | - Nirala Singh
- Department
of Chemical Engineering, University of Michigan-Ann
Arbor, Ann Arbor, Michigan48109, United
States
- Catalysis
Science and Technology Institute, University
of Michigan-Ann Arbor, Ann Arbor, Michigan48109, United States
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4
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Voskresenskaya OO. Hydrolysis and Complex Formation of Cerium(IV) with Dioxysuccinic Acid in Sulfate Solutions. RUSS J INORG CHEM+ 2022. [DOI: 10.1134/s0036023622070233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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5
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Manjula N, Pulikkutty S, Chen TW, Chen SM, Fan CH, Ali MA, Al-Hemaid FM. Electrochemical sensor based on cerium niobium oxide nanoparticles modified electrode for sensing of environmental toxicity in water samples. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Arman MO, Geboes B, Van Hecke K, Binnemans K, Cardinaels T. Electrochemical oxidation of terbium(III) in aqueous media: influence of supporting electrolyte on oxidation potential and stability. J APPL ELECTROCHEM 2022. [DOI: 10.1007/s10800-021-01651-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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8
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Heinritz A, Binninger T, Patru A, Schmidt TJ. Asymmetric Butler–Volmer Kinetics of the Electrochemical Ce(III)/Ce(IV) Redox Couple on Polycrystalline Au Electrodes in Sulfuric Acid and the Dissociation Field Effect. ACS Catal 2021. [DOI: 10.1021/acscatal.0c04587] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adrian Heinritz
- Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Tobias Binninger
- Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen, Switzerland
- ICGM, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
| | - Alexandra Patru
- Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Thomas J. Schmidt
- Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen, Switzerland
- Laboratory of Physical Chemistry, ETH Zürich, 8093 Zürich, Switzerland
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9
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Popivker I, Meyerstein D, Gitin D, Avraham EN, Maimon E, Zidki T, Cohen H, Yardeni G, Moisy P, Pevzner S, Zilbermann I. Redox Properties of Ce IVDOTA in Carbonated Aqueous Solutions. A Radiolytic and an Electrochemical Study. J Phys Chem A 2021; 125:1436-1446. [PMID: 33566599 DOI: 10.1021/acs.jpca.0c09134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The redox chemistry of CeIIIDOTA in cage in carbonate solutions was studied using electrochemistry and radiolysis techniques (continuous radiolysis and pulse radiolysis). Spectroscopic measurements point out that the species present in the solutions at high bicarbonate concentrations are [CeIIIDOTA(CO3)]3- (or less plausible [CeIIIDOTA(HCO3)]2-) with the carbonate (bicarbonate) anion as the ninth ligand versus [CeIIIDOTA(H2O)]- present in the absence of bicarbonate. Electrochemical results show a relatively low increase in the thermodynamic stabilization of the redox couple CeIV/III in the presence of carbonate versus its aqueous analogue. [CeIVDOTA(CO3)]2- and [CeIVDOTA(H2O)], prepared electrochemically, decompose photolytically. However, kept in the dark, both are relatively long lived; [CeIVDOTA(H2O)], though, is orders of magnitude kinetically more stable (a considerably longer half-life). Thus, one concludes that the carbonate species have a different mechanism of decomposition depending also on the presence of dioxygen after its preparation (in deaerated/aerated solutions). The [CeIVDOTA(CO3)]2- species is produced radiolytically by oxidation of the trivalent species by CO3•- with a rate constant, measured using pulse radiolysis, of 3.3 × 105 M-1 s-1. This rate constant is at least 1 order of magnitude smaller than most of the rate constants so far reported for the reaction of CO3•- with transition metal/lanthanide (cerium)/actinide complexes. This result together with the bulkiness of the reactants might suggest an outer-sphere electron transfer rather than the inner-sphere one so far proposed. The lifetime of the tetravalent cerium species obtained radiolytically in the presence of carbonate is shorter than the electrochemical one, suggesting a different conformer involved.
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Affiliation(s)
- Inna Popivker
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel
| | - Dan Meyerstein
- Department of Chemical Sciences and the Schlesinger Family Center for Compact Accelerators, Radiation Sources and Applications, Ariel University, Ariel 40700, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Dalia Gitin
- Department of Chemical Sciences and the Schlesinger Family Center for Compact Accelerators, Radiation Sources and Applications, Ariel University, Ariel 40700, Israel
| | - Elad N Avraham
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Eric Maimon
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Tomer Zidki
- Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Haim Cohen
- Department of Chemical Sciences and the Schlesinger Family Center for Compact Accelerators, Radiation Sources and Applications, Ariel University, Ariel 40700, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
| | - Guy Yardeni
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel
| | - Philippe Moisy
- CEA, DES, ISEC, DMRC, University of Montpellier, 30207 Bagnols-sur-Cèze, Marcoule, France
| | - Svetlana Pevzner
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel
| | - Israel Zilbermann
- Chemistry Department, Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.,Chemistry Department, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84170, Israel
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10
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Abstract
Understanding the mechanism of metal electrodeposition on graphene as the simplest building block of all graphitic materials is important for electrocatalysis and the creation of metal contacts in electronics. The present work investigates copper electrodeposition onto epitaxial graphene on 4H-SiC by experimental and computational techniques. The two subsequent single-electron transfer steps were coherently quantified by electrochemistry and density functional theory (DFT). The kinetic measurements revealed the instantaneous nucleation mechanism of copper (Cu) electrodeposition, controlled by the convergent diffusion of reactant to the limited number of nucleation sites. Cu can freely migrate across the electrode surface. These findings provide fundamental insights into the nature of copper reduction and nucleation mechanisms and can be used as a starting point for performing more sophisticated investigations and developing real applications.
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11
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Keshmirizadeh E, Modarress H, Jahedi F. Removal of Acid Blue 62 textile dye from aqueous solutions by cerium reagents. ENVIRONMENTAL TECHNOLOGY 2020; 41:785-796. [PMID: 30105935 DOI: 10.1080/09593330.2018.1511633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 07/01/2018] [Indexed: 06/08/2023]
Abstract
The removal of Acid Blue 62 (AB62) dye which is known as a pollutant agent and contains in wastewater of textile industry has been studied in this work by using five various cerium compounds as the oxidizing agents. The parameters involved in the oxidation reaction such as pH, initial dye concentration and the oxidizing agent dosage have been investigated using both batch and semi-batch reactors at ambient temperature. The results indicated that the rate of oxidation for various cerium reagents is in the following order: CeF4 > (NH4)2Ce (NO3)6 > Ce (SO4)2 > CeCl3 > Ce (CH3COO)3, where cerium fluoride (CeF4) had the highest removal yields, 99.9% and 95%, for dye de-colouration and COD (chemical oxygen demand), respectively. The analysis of the dye removal was done by using UV-VIS spectrometry, GC-MS and HPLC methods which indicated the aromatic ring cleavage of AB62 dye by CeF4. The half-life measurement was employed to evaluate the reaction rate model for decomposition of AB62 dye by CeF4.
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Affiliation(s)
| | - Hamid Modarress
- Department of Chemical Engineering, Amir-Kabir University of Technology, Tehran, Iran
| | - Fatemeh Jahedi
- Department of Chemistry, Karaj Branch, Islamic Azad University, Karaj, Iran
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12
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Shtepliuk I, Santangelo MF, Vagin M, Ivanov IG, Khranovskyy V, Iakimov T, Eriksson J, Yakimova R. Understanding Graphene Response to Neutral and Charged Lead Species: Theory and Experiment. MATERIALS 2018; 11:ma11102059. [PMID: 30360390 PMCID: PMC6212856 DOI: 10.3390/ma11102059] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 10/10/2018] [Accepted: 10/19/2018] [Indexed: 12/30/2022]
Abstract
Deep understanding of binding of toxic Lead (Pb) species on the surface of two-dimensional materials is a required prerequisite for the development of next-generation sensors that can provide fast and real-time detection of critically low concentrations. Here we report atomistic insights into the Lead behavior on epitaxial graphene (Gr) on silicon carbide substrates by thorough complementary study of voltammetry, electrical characterization, Raman spectroscopy, and Density Functional Theory (DFT). It is verified that the epitaxial graphene exhibits quasi-reversible anode reactions in aqueous solutions, providing a well-defined redox peak for Pb species and good linearity over a concentration range from 1 nM to 1 µM. The conductometric approach offers another way to investigate Lead adsorption, which is based on the formations of stable charge-transfer complexes affecting the p-type conductivity of epitaxial graphene. Our results suggest the adsorption ability of the epitaxial graphene towards divalent Lead ions is concentration-dependent and tends to saturate at higher concentrations. To elucidate the mechanisms responsible for Pb adsorption, we performed DFT calculations and estimated the solvent-mediated interaction between Lead species in different oxidative forms and graphene. Our results provide central information regarding the energetics and structure of Pb-graphene interacting complexes that underlay the adsorption mechanisms of neutral and divalent Lead species. Such a holistic understanding favors design and synthesis of new sensitive materials for water quality monitoring.
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Affiliation(s)
- Ivan Shtepliuk
- Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
- Frantsevich Institute for Problems of Materials Science, NASU, 142 Kyiv, Ukraine.
| | | | - Mikhail Vagin
- Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
- Department of Science and Technology, Physics and Electronics, Linköping University, SE-58183 Linköping, Sweden.
| | - Ivan G Ivanov
- Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
| | - Volodymyr Khranovskyy
- Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
| | - Tihomir Iakimov
- Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
| | - Jens Eriksson
- Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
| | - Rositsa Yakimova
- Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
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13
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HE J, LI Y, XUE X, RU H, HUANG X, YANG H. A novel Ce(IV) ion-selective polyvinyl chloride membrane electrode based on HDEHP and HEH/EHP. J RARE EARTH 2017. [DOI: 10.1016/s1002-0721(17)60997-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Voskresenskaya OO, Skorik NA, Yuzhakova YV. Thermodynamics of the formation of cerium(IV) malonate complex and the kinetics of its redox decomposition. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2017. [DOI: 10.1134/s0036024417040318] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Paul M, Shirase S, Morimoto Y, Mathey L, Murugesapandian B, Tanaka S, Itoh S, Tsurugi H, Mashima K. Cerium-Complex-Catalyzed Oxidation of Arylmethanols under Atmospheric Pressure of Dioxygen and Its Mechanism through a Side-On μ-Peroxo Dicerium(IV) Complex. Chemistry 2016; 22:4008-14. [PMID: 26797722 DOI: 10.1002/chem.201503846] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Indexed: 11/05/2022]
Abstract
A new Ce(IV) complex [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)2] (1), bearing a dianionic pentadentate ligand with an N3O2 donor set, has been prepared by treating (NH4)2Ce(NO3)6 with the sodium salt of ligand L1. Complex 1 in the presence of TEMPO and 4 Å molecular sieves (MS4 A) has been found to serve as a catalyst for the oxidation of arylmethanols using dioxygen as an oxidant. We propose an oxidation mechanism based on the isolation and reactivity study of a trivalent cerium complex [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)(THF)] (2), its side-on μ-O2 adduct [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)]2(μ-η(2):η(2)-O2) (3), and the hydroxo-bridged Ce(IV) complex [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)]2(μ-OH)2 (4) as key intermediates during the catalytic cycle. Complex 2 was synthesized by reduction of 1 with 2,5-dimethyl-1,4-bis(trimethylsilyl)-1,4-diazacyclohexadiene. Bubbling O2 into a solution of 2 resulted in formation of the peroxo complex 3. This provides the first direct evidence for cerium-catalyzed oxidation of alcohols under an O2 atmosphere.
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Affiliation(s)
- Mitali Paul
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Satoru Shirase
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Yuma Morimoto
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Laurent Mathey
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | | | - Shinji Tanaka
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
| | - Shinobu Itoh
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Hayato Tsurugi
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan.
| | - Kazushi Mashima
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan.
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16
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Kroll A, Behra R, Kaegi R, Sigg L. Extracellular polymeric substances (EPS) of freshwater biofilms stabilize and modify CeO2 and Ag nanoparticles. PLoS One 2014; 9:e110709. [PMID: 25333364 PMCID: PMC4204993 DOI: 10.1371/journal.pone.0110709] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Accepted: 09/25/2014] [Indexed: 11/29/2022] Open
Abstract
Streams are potential receiving compartments for engineered nanoparticles (NP). In streams, NP may remain dispersed or settle to the benthic compartment. Both dispersed and settling NP can accumulate in benthic biofilms called periphyton that are essential to stream ecosystems. Periphytic organisms excrete extracellular polymeric substances (EPS) that interact with any material reaching the biofilms. To understand the interaction of NP with periphyton it is therefore crucial to study the interaction of NP with EPS. We investigated the influence of EPS on the physicochemical properties of selected NP (CeO2, Ag) under controlled conditions at pH 6, 7.6, 8.6 and light or dark exposure. We extracted EPS from five different periphyton communities, characterized the extracts, and exposed CeO2 and carbonate-stabilized Ag NP (0.5 and 5 mg/L, both 25 nm primary particle size) and AgNO3 to EPS (10 mg/L) over two weeks. We measured NP size distribution, shape, primary particle size, surface plasmon resonance, and dissolution. All EPS extracts were composed of biopolymers, building blocks of humic substances, low molecular weight (Mr) acids, and small amphiphilic or neutral compounds in varying concentrations. CeO2 NP were stabilized by EPS independent of pH and light/dark while dissolution increased over time in the dark at pH 6. EPS induced a size increase in Ag NP in the light with decreasing pH and the formation of metallic Ag NP from AgNO3 at the same conditions via EPS-enhanced photoreduction. NP transformation and formation were slower in the extract with the lowest biopolymer and low Mr acid concentrations. Periphytic EPS in combination with naturally varying pH and light/dark conditions influence the properties of the Ag and CeO2 NP tested and thus the exposure conditions within biofilms. Our results indicate that periphytic organisms may be exposed to a constantly changing mixture of engineered and naturally formed Ag NP and Ag+.
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Affiliation(s)
- Alexandra Kroll
- Environmental Toxicology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland
- * E-mail:
| | - Renata Behra
- Environmental Toxicology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland
| | - Ralf Kaegi
- Environmental Toxicology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland
| | - Laura Sigg
- Environmental Toxicology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland
- Institute of Biogeochemistry and Pollutant Dynamics IBP, Swiss Federal Institute of Technology in Zurich (ETHZ), Zurich, Switzerland
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Piro NA, Robinson JR, Walsh PJ, Schelter EJ. The electrochemical behavior of cerium(III/IV) complexes: Thermodynamics, kinetics and applications in synthesis. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.08.034] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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18
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Williams UJ, Robinson JR, Lewis AJ, Carroll PJ, Walsh PJ, Schelter EJ. Synthesis, bonding, and reactivity of a cerium(IV) fluoride complex. Inorg Chem 2013; 53:27-9. [PMID: 24313793 DOI: 10.1021/ic402769u] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Oxidation of Ce[N(SiMe3)2]3 in the presence of PF6(-) or BF4(-) afforded isolation of CeF[N(SiMe3)2]3. Structural and electrochemical characterization shows that this compound is in its tetravalent oxidation state and contains a terminal fluoride ligand. Spectroscopy and density functional theory have been used to characterize the Ce-F bond as ionic, which is reinforced by an initial reactivity study that demonstrates the nucleophilicity of the fluoride ligand.
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Affiliation(s)
- Ursula J Williams
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
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