Reduction of plutonium in acidic solutions by mesoporous carbons

Parsons-Moss, Tashi; Jones, Stephen A.; Wang, Jinxiu; Wu, Zhangxiong; Uribe, Eva; Zhao, Dongyuan; Nitsche, H.

doi:10.1007/s10967-015-4647-7

Cited by 11 publications

(7 citation statements)

References 33 publications

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“…e cavities, that make an integral part of the coronoids, act as prototypes for scheming and synthesizing novel nanomaterials of significance in nano and biotechnology and the incipient field of nano-medicines. ey have also been used in the design and synthesis of distinct porous and mesoporous materials grounded on calixarenes and mesoporous silica for the sequestration and complexation of toxic nuclear waste and other environmental pollutants [30] Coronoid systems are also widely examined in the study of coronoid hydrocarbons.…”

Section: Structure Of Coronoid Polycyclic Aromatic Hydrocarbonsmentioning

confidence: 99%

On Computation and Analysis of Topological Index-Based Invariants for Complex Coronoid Systems

et al. 2021

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In chemical graph theory, benzenoid systems are interrogated as they exhibit the chemical compounds known as benzenoid hydrocarbons. Benzenoid schemes are circumscribed as planar connected finite graphs having no cut vertices wherein the entire internal sections are collaboratively congruent regular hexagon. The past couple of decennium has acknowledged an extravagant development regarding implementation of information theoretic framework in miscellaneous ramification of science, for instance, in social sciences, biological, physical, and engineering. Explicitly, this tremendous improvement has been outstanding in the field of soft computing, molecular biology, and information technology. The information theory, delineated by Claud Shannon, has no less importance when it was considered. Shannon put forwarded the apprehension of entropy to enumerate upper bounds in transmission rates in telephonic channels, in optical communication, and in wireless. The prestigious feature of entropy is that it entitles the amount of uncertainty in a system. The substantial participation of this paper is to explore characteristics of graph entropies and then keep moving forward to talk about the formation of coronoid polycyclic aromatic hydrocarbons. Likewise, we estimate entropies through precise topological indices established on degree of terminal nodes.

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Section: Structure Of Coronoid Polycyclic Aromatic Hydrocarbonsmentioning

confidence: 99%

On Computation and Analysis of Topological Index-Based Invariants for Complex Coronoid Systems

et al. 2021

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“…en, using the equation of forgotten entropy, the result is obtained as [8] 􏽨 􏽩 × [24rs + 12s] ×[13] [13] 􏽨 􏽩 × [24rs − 6r] ×[18] [18] 􏽨 􏽩 􏽨 􏽩.…”

Section: S No Degree-based Entropymentioning

confidence: 99%

“…e cavities, which are an intrinsic element of the Kekulene system, serve as prototypes for developing and synthesizing novel nanomaterials with applications in nanotechnology and biotechnology, as well as the burgeoning field of nanomedicine. ey have also been used in the design and synthesis of porous and mesoporous materials based on calixarenes and mesoporous silica for the storage and complex formation of hazardous nuclear waste and other contaminants [8][9][10]. It has been demonstrated that by utilizing Kekulene system knowledge, one can accurately compute total pi-electron energy, resonance energy, and coronoid hydrocarbon enumeration [11].…”

Section: Introductionmentioning

confidence: 99%

VDB Entropy Measures and Irregularity-Based Indices for the Rectangular Kekulene System

Zhao

Julietraja²,

Venugopal

et al. 2021

Journal of Mathematics

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Theoretical chemists are fascinated by polycyclic aromatic hydrocarbons (PAHs) because of their unique electromagnetic and other significant properties, such as superaromaticity. The study of PAHs has been steadily increasing because of their wide-ranging applications in several fields, like steel manufacturing, shale oil extraction, coal gasification, production of coke, tar distillation, and nanosciences. Topological indices (TIs) are numerical quantities that give a mathematical expression for the chemical structures. They are useful and cost-effective tools for predicting the properties of chemical compounds theoretically. Entropic network measures are a type of TIs with a broad array of applications, involving quantitative characterization of molecular structures and the investigation of some specific chemical properties of molecular graphs. Irregularity indices are numerical parameters that quantify the irregularity of a molecular graph and are used to predict some of the chemical properties, including boiling points, resistance, enthalpy of vaporization, entropy, melting points, and toxicity. This study aims to determine analytical expressions for the VDB entropy and irregularity-based indices in the rectangular Kekulene system.

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“…From a broader perspective, redox behavior has also been observed in other actinide-surface complexes . Specifically, reduction behavior has been observed with the UO 2 2+ ion, although in this case the reduction to a U IV surface adsorbate has been limited to either a redox active mineral surface − or in the presence of a solution reductant, notably an organic species such as humic acids. , …”

Section: Introductionmentioning

confidence: 99%

“…7 Specifically, reduction behavior has been observed with the UO 2 2+ ion, although in this case the reduction to a U IV surface adsorbate has been limited to either a redox active mineral surface 29−34 or in the presence of a solution reductant, notably an organic species such as humic acids. 35,36 Our interest in understanding the role of a redox-inactive surface on the speciation of adsorbed Pu has focused on muscovite mica, 37 a phyllosilicate whose primary, basal-plane surface is ideal for studies using X-ray surface-scattering probes. 38 Pu has been shown to adsorb to the mica surface as the tetravalent ion, with an estimated intrinsic adsorption constant K°of about 7 × 10 7 M −1 , 37 a value similar to that seen for natural clay minerals.…”

Section: ■ Introductionmentioning

confidence: 99%

A Comparison of Adsorption, Reduction, and Polymerization of the Plutonyl(VI) and Uranyl(VI) Ions from Solution onto the Muscovite Basal Plane

et al. 2016

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X-ray scattering techniques [in situ resonant anomalous X-ray reflectivity (RAXR) and specular crystal truncation rods (CTR)] were used to compare muscovite (001) surfaces in contact with solutions containing either 0.1 mM plutonyl(VI) or 1 mM uranyl(VI) at pH = 3.2 ± 0.2, I(NaCl) = 0.1 M, as well as in situ grazing-incidence X-ray absorption near-edge structure (GI XANES) spectroscopy and ex situ alpha spectrometry. Details of the surface coverage are found to be very different. In the case of Pu, alpha spectrometry finds a surface coverage of 8.3 Pu/A (A = 46.72 Å, the unit cell area), far in excess of the 0.5 Pu/A expected for ionic adsorption of PuO. GI XANES results show that Pu is predominantly tetravalent on the surface, and the CTR/RAXR results show that the adsorbed Pu is broadly distributed. Taken together with previous findings, the results are consistent with adsorption of Pu in the form of Pu(IV)-oxo-nanoparticles. In contrast, uranyl shows only negligible, if any, adsorption according to all methods applied. These results are discussed and compared within the context of known Pu and U redox chemistry.

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Reduction of plutonium in acidic solutions by mesoporous carbons

Cited by 11 publications

References 33 publications

On Computation and Analysis of Topological Index-Based Invariants for Complex Coronoid Systems

On Computation and Analysis of Topological Index-Based Invariants for Complex Coronoid Systems

VDB Entropy Measures and Irregularity-Based Indices for the Rectangular Kekulene System

A Comparison of Adsorption, Reduction, and Polymerization of the Plutonyl(VI) and Uranyl(VI) Ions from Solution onto the Muscovite Basal Plane

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