Radon adsorption on activated carbon and the effect of some airborne contaminants

Bocanegra, Rey; Hopke, Philip K.

doi:10.1016/0048-9697(88)90107-6

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…The estimation of the soil water content was approached using remotely sensed data provided by the EUMETSAT organization. We selected the soil moisture product obtained by the ASCAT sensor (Brocca et al, 2017), which is a real aperture radar operating at 5.255 GHz (C-band) (EUMETSAT, 2015).…”

Section: Soil Rn Fluxmentioning

confidence: 99%

“…The physico-chemical behavior of radon is the key feature in all of these techniques: it is a noble gas that, once emitted by soil, leaves the surface by molecular diffusion or by convection, and enters the atmosphere where the turbulent mixing diffuses nuclides (Porstendorfer, 1994). This gas is chemically unreactive and physisorption through electrostatic attraction on particles is negligible (Bocanegra and Hopke, 1988). Conversely, the radon decay products are metallic elements that are easily physically fixed to existing aerosol particles in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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High time-resolved radon progeny measurements in the Arctic region (Svalbard islands, Norway): results and potentialities

et al. 2018

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Abstract. The estimation of radon progeny in the Arctic region represents a scientific challenge due to the required low limit of detection in consideration of the limited radon emanation associated with permafrost dynamics. This preliminary study highlighted, for the first time above 70∘ N, the possibility to monitor radon progeny in the Arctic region with a higher time resolution. The composition of the radon progeny offered the opportunity to identify air masses dominated by long-range transport, in presence or absence of near-constant radon progeny instead of long- and short-lived progenies. Furthermore, the different ratio between radon and thoron progenies evidenced the contributions of local emissions and atmospheric stability. Two different emanation periods were defined in accordance with the permafrost dynamics at the ground and several accumulation windows were recognized coherently to the meteo-climatic conditions occurring at the study site.

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Section: Soil Rn Fluxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High time-resolved radon progeny measurements in the Arctic region (Svalbard islands, Norway): results and potentialities

et al. 2018

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“…The resulting Rn and its decay products are recognized as the primary contributors of natural ionizing radiation, posing a significant risk of lung cancer [3]. As a result, there is a global focus on studying the capture of radon from the atmosphere [4][5][6]. To date, there are three primary strategies for removing radon from confined spaces: ventilation systems [7], plugging diffusion paths [8], and adsorption methods [9,10].…”

Section: Introductionmentioning

confidence: 99%

High-Throughput Computational Screening of Two-Dimensional Covalent Organic Frameworks (2D COFs) for Capturing Radon in Moist Air

et al. 2023

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Radon (Rn) and its decay products are the primary sources of natural ionizing radiation exposure for the public, posing significant health risks, including being a leading cause of lung cancer. Porous material-based adsorbents offer a feasible and efficient solution for controlling Rn concentrations in various scenes to achieve safe levels. However, due to competitive adsorption between Rn and water, finding candidates with a higher affinity and capacity for capturing Rn in humid air remains a significant challenge. Here, we conducted high-throughput computational screening of 8641 two-dimensional covalent organic frameworks (2D COFs) in moist air using grand canonical Monte Carlo simulations. We identified the top five candidates and revealed the structure–performance relationship. Our findings suggest that a well-defined cavity with an approximate spherical inner space, with a diameter matching that of Rn, is the structural basis for a proper Rn capturing site. This is because the excellent steric match between the cavity and Rn maximizes their van der Waals dispersion interactions. Additionally, the significant polarization electrostatic potential surface of the cavity can regulate the adsorption energy of water and ultimately impact Rn selectivity. Our study offers a potential route for Rn management using 2D COFs in moist air and provides a scientific basis for further experimentation.

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“…All of these techniques are based on the chemical behavior of radon: it is a noble gas that, once emitted by soil, leaves the surface by molecular diffusion or by convection, and enters the atmosphere where it is distributed by turbulent mixing (Porstendorfer, 10 1994). This gas is chemically unreactive and a negligible amount can be adsorbed on particles by physi-sorption through electrostatic attraction (Bocanegra and Hopke, 1988). On the other hand, the radon decay products ( 222 Rn and 220 Rn have 1 2 ⁄ , respectively, of about 3.8 days and 55 s) are metallic elements that are easily fixed to existing aerosol particles in the atmosphere.…”

mentioning

confidence: 99%

High-time resolved radon-progeny measurements in the Arctic region (Svalbard Islands, Norway): results and potentialities

Salzano¹,

Pasini²,

Ianniello³

et al. 2017

Preprint

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Abstract. The estimation of radon progeny in the Arctic region represents a scientific challenge due to the required low limit 10 of detection in consideration of the limited radon emanation associated with permafrost dynamics. This preliminary study highlighted, for the first time, the possibility to monitor radon progeny in the Arctic region with a higher time resolution. The composition of the radon progeny offered the opportunity to identify air masses dominated by long-range transport, in presence or not of near-constant radon progeny instead of long and short lived progenies. Furthermore, the different ratio between radon and thoron progenies evidenced the contributions of local emissions and atmospheric stability. Two different emanation 15 periods were defined in accordance to the permafrost dynamics at the ground and several accumulation windows were recognized coherently to the meteo-climatic conditions occurring at the study site.

show abstract

Radon adsorption on activated carbon and the effect of some airborne contaminants

Cited by 9 publications

References 5 publications

High time-resolved radon progeny measurements in the Arctic region (Svalbard islands, Norway): results and potentialities

High time-resolved radon progeny measurements in the Arctic region (Svalbard islands, Norway): results and potentialities

High-Throughput Computational Screening of Two-Dimensional Covalent Organic Frameworks (2D COFs) for Capturing Radon in Moist Air

High-time resolved radon-progeny measurements in the Arctic region (Svalbard Islands, Norway): results and potentialities

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