Preliminary communication

https://doi.org/10.5562/cca4013

Comparison of Radon Adsorption on Hematite and Charcoal Activated Powder in Air

Vanja Radolić orcid.org/0000-0002-7843-2626 ; Josip Juraj Strossmayer University of Osijek, Department of Physics, Trg Ljudevita Gaja 6, HR-31000 Osijek, Croatia
Goran Šmit orcid.org/0009-0004-5965-8488 ; Josip Juraj Strossmayer University of Osijek, Department of Physics, Trg Ljudevita Gaja 6, HR-31000 Osijek, Croatia
Igor Miklavčić ; Josip Juraj Strossmayer University of Osijek, Department of Physics, Trg Ljudevita Gaja 6, HR-31000 Osijek, Croatia
Marina Poje Sovilj orcid.org/0000-0003-0381-8556 ; Josip Juraj Strossmayer University of Osijek, Department of Physics, Trg Ljudevita Gaja 6, HR-31000 Osijek, Croatia

Abstract

Adsorption of radon in the air was investigated on hematite, α-Fe2O3, and charcoal activated powder. Hematite had almost doubled efficiency in comparison to charcoal activated powder in the same experimental conditions but over a significantly longer period. Adsorption isotherms revealed a typical Langmuir shape on hematite and almost linear on activated charcoal. Linear models of Langmuir, Freundlich and Dubinin-Radushkevich isotherms showed that radon adsorption on both adsorbents is a favourable chemical process, with stronger interactions on hematite, that takes place forming a monolayer of adsorbed radon. The kinetic analysis confirmed forming of a monolayer on both adsorbents and two rate-controlling steps during radon adsorption on hematite, instead of one on activated charcoal, which could be considered as a reason of slower rate of process on hematite.

Keywords

hematite; activated charcoal; radon; adsorption; air

Hrčak ID:

309415

URI

https://hrcak.srce.hr/309415

Publication date:

17.10.2023.

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