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11 results on '"Pinkard B"'

1. Firewall and DMZ DesignISA Server 2005

Author

DUBRAWSKY, I, primary, TATEBAUMRUCKER, C, additional, CAESAR, J, additional, KRISHNAMURTHY, M, additional, SHINDER, T, additional, PINKARD, B, additional, SEAGREN, E, additional, and HUNTER, L, additional

Published
2006
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2. Firewall and DMZ DesignJuniper NetScreen

Author

DUBRAWSKY, I, primary, TATEBAUMRUCKER, C, additional, CAESAR, J, additional, KRISHNAMURTHY, M, additional, SHINDER, T, additional, PINKARD, B, additional, SEAGREN, E, additional, and HUNTER, L, additional

Published
2006
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3. Implementing Wireless DMZs

Author

DUBRAWSKY, I, primary, TATEBAUMRUCKER, C, additional, CAESAR, J, additional, KRISHNAMURTHY, M, additional, SHINDER, T, additional, PINKARD, B, additional, SEAGREN, E, additional, and HUNTER, L, additional

Published
2006
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4. DMZ-Based VPN Services

Author

DUBRAWSKY, I, primary, TATEBAUMRUCKER, C, additional, CAESAR, J, additional, KRISHNAMURTHY, M, additional, SHINDER, T, additional, PINKARD, B, additional, SEAGREN, E, additional, and HUNTER, L, additional

Published
2006
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5. Windows Bastion Hosts

Author

DUBRAWSKY, I, primary, TATEBAUMRUCKER, C, additional, CAESAR, J, additional, KRISHNAMURTHY, M, additional, SHINDER, T, additional, PINKARD, B, additional, SEAGREN, E, additional, and HUNTER, L, additional

Published
2006
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6. Linux Bastion Hosts

Author

DUBRAWSKY, I, primary, TATEBAUMRUCKER, C, additional, CAESAR, J, additional, KRISHNAMURTHY, M, additional, SHINDER, T, additional, PINKARD, B, additional, SEAGREN, E, additional, and HUNTER, L, additional

Published
2006
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8. Index

Author

DUBRAWSKY, I, primary, TATEBAUMRUCKER, C, additional, CAESAR, J, additional, KRISHNAMURTHY, M, additional, SHINDER, T, additional, PINKARD, B, additional, SEAGREN, E, additional, and HUNTER, L, additional

Published
2006
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9. DMZ Router and Switch Security

Author

DUBRAWSKY, I, primary, TATEBAUMRUCKER, C, additional, CAESAR, J, additional, KRISHNAMURTHY, M, additional, SHINDER, T, additional, PINKARD, B, additional, SEAGREN, E, additional, and HUNTER, L, additional

Published
2006
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10. Regeneration of PFAS-laden granular activated carbon by modified supercritical CO 2 extraction.

Author

Didenko T, Lau A, Purohit AL, Feng J, Pinkard B, Ateia M, and Novosselov IV

Subjects
Adsorption, Solvents chemistry, Fluorocarbons chemistry, Charcoal chemistry, Carbon Dioxide chemistry, Caprylates chemistry, Water Pollutants, Chemical chemistry
Abstract

Granular activated carbon (GAC) is widely used to treat contaminated per- and polyfluoroalkyl substances (PFAS) waste streams, resulting in the accumulation of large quantities of spent GAC that need to be landfilled or regenerated. A novel modified supercritical CO 2 (scCO 2 ) extraction for regeneration of spent GAC is developed. With the addition of organic solvents and acid modifiers, the procedure yielded >99% perfluorooctanoic acid (PFOA) desorption after a 60-min treatment in a continuous flow reactor. The mild extraction conditions at T ∼100 °C do not trigger the formation of volatile organic fluorine or changes in GAC sorbent properties. Mechanistically, the high miscibility of co-solvent/scCO 2 eliminates diffusion transport limitations, enabling rapid reagent and PFAS transport in a single-phase (gas-like) medium. The introduction of organic co-solvent and the absence of water reverses hydrophobic interactions between GAC and the PFAS. The acid modifier minimizes the electrostatic PFOA/GAC interactions by protonating the perfluorooctanoate ion and providing competition for active GAC sites. The approach offers an economically effective regeneration scheme, enabling the reuse of sorbents and yielding effluent with a high loading of PFAS that is amenable to subsequent end-of-life treatment technologies., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Published
2025
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