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Your search keyword '"Rubasinghege, Gayan"' showing total 25 results
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25 results on '"Rubasinghege, Gayan"'

8. Characterization and Toxicity Analysis of Lab-Created Respirable Coal Mine Dust from the Appalachians and Rocky Mountains Regions

Author

Salinas, Vanessa, primary, Das, Milton, additional, Jacquez, Quiteria, additional, Camacho, Alexandra, additional, Zychowski, Katherine, additional, Hovingh, Mark, additional, Medina, Alexander, additional, Rubasinghege, Gayan, additional, Rezaee, Mohammad, additional, Baltrusaitis, Jonas, additional, Fairley, Neal, additional, and Roghanchi, Pedram, additional

Published
2022
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11. Mechanochemistry of Group 4 Element-Based Metal–Organic Frameworks

Author

Salvador, Fillipp Edvard, primary, Miller, Vance, additional, Shimada, Kaoru, additional, Wang, Chen-Hao, additional, Wright, Joshua, additional, Das, Milton, additional, Chen, Ying-Pin, additional, Chen, Yu-Sheng, additional, Sheehan, Chris, additional, Xu, Wenqian, additional, Rubasinghege, Gayan, additional, and Gao, Wen-Yang, additional

Published
2021
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17. Charge‐Separated and Lewis Paired Metal–Organic Framework for Anion Exchange and CO2 Chemical Fixation.

Author

Thapa, Sheela, Meng, Lingyao, Hettiarachchi, Eshani, Bader, Yousef K., Dickie, Diane A., Rubasinghege, Gayan, Ivanov, Sergei A., Vreeland, Erika C., and Qin, Yang

Subjects
LEWIS pairs (Chemistry), METAL-organic frameworks, CHEMICAL reactions, ANIONS, LEWIS bases, ION-permeable membranes, PYRAZOLYL compounds
Abstract

Charge‐separated metal–organic frameworks (MOFs) are a unique class of MOFs that can possess added properties originating from the exposed ionic species. A new charge‐separated MOF, namely, UNM‐6 synthesized from a tetrahedral borate ligand and Co2+ cation is reported herein. UNM‐6 crystalizes into the highly symmetric P43n space group with fourfold interpenetration, despite the stoichiometric imbalance between the B and Co atoms, which also leads to loosely bound NO3− anions within the crystal structure. These NO3− ions can be quantitatively exchanged with various other anions, leading to Lewis acid (Co2+) and Lewis base (anions) pairs within the pores and potentially cooperative catalytic activities. For example, UNM‐6‐Br, the MOF after anion exchange with Br− anions, displays high catalytic activity and stability in reactions of CO2 chemical fixation into cyclic carbonates. [ABSTRACT FROM AUTHOR]

Published
2020
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24. Atmospheric Processing and Iron Mobilization of Ilmenite: Iron-Containing Ternary Oxide in Mineral Dust Aerosol

Author

Hettiarachchi, Eshani, Hurab, Omar, and Rubasinghege, Gayan

Abstract

Over the last several decades, iron has been identified as a limiting nutrient in about half of the world’s oceans. Its most significant source is identified as deposited iron-containing mineral dust that has been processed during atmospheric transportation. The current work focuses on chemical and photochemical processing of iron-containing mineral dust particles in the presence of nitric acid, and an organic pollutant dimethyl sulfide under atmospherically relevant conditions. More importantly, ilmenite (FeTiO3) is evaluated as a proxy for the iron-containing mineral dust. The presence of titanium in its lattice structure provides higher complexity to mimic mineral dust, yet it is simple enough to study reaction pathways and mechanisms. Here, spectroscopic methods are combined with dissolution measurements to investigate atmospheric processing of iron in mineral dust, with specific focus on particle mineralogy, particle size, and their environmental conditions (i.e., pH and solar flux). Our results indicate that the presence of titanium elemental composition enhances iron dissolution from mineral dust, at least by 2-fold comparison with its nontitanium-containing counterparts. The extent of iron dissolution and speciation is further influenced by the above factors. Thus, our work highlights these important, yet unconsidered, factors in the atmospheric processing of iron-containing mineral dust aerosol.

Published
2024
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25. Mineralogy controlled dissolution of uranium from airborne dust in simulated lung fluids (SLFs) and possible health implications.

Author

HETTIARACHCHI, ESHANI, FREY, BONNIE, PAUL, SHAYLENE, RUBASINGHEGE, GAYAN, and CADOL, DANIEL

Subjects
CARDIOVASCULAR agents, MINERALOGY, GAMBEL'S quail, URANIUM, URANYL compounds
Abstract

The recent increase in cardiovascular and metabolic disease in the Navajo population residing close to the Grants Mining District (GMD) in New Mexico is suggested to be due to exposure to environmental contaminants, in particular uranium in respirable dusts (fine dust small enough to reach gas exchanging/ alveolar region of lungs). However, the chemistry of uranium-containing-dust dissolution in lung fluids and the role of mineralogy are poorly understood, as is their impact on toxic effects. The current study is focused on the dissolution of respirable-sized U-containing-dust, collected from several sites near Jackpile and St. Anthony mines in the GMD, in two simulated lung fluids (SLFs): Gambel's solution (GS) and Artificial Lysosomal Fluid (ALF). We observe that the respirable dust includes uranium minerals that yield the uranyl cation, UO2 2+, as the primary dissolved species in these fluids. Dust rich with minerals uraninite and carnotite is more soluble in GS, which mimics interstitial conditions of the lungs. In contrast, dust with low uraninite and high kaolinite is more soluble in ALF, which simulates the alveolar macrophage environment during phagocytosis. Moreover, geochemical modeling, performed using PHREEQC, is in good agreement with our experimental results. Thus, the current study highlights the importance of site-specific toxicological assessments across mining districts with the focus on their mineralogical differences. [ABSTRACT FROM AUTHOR]

Published
2018

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