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Article

Photothermal Desorption of Toluene from Carbonaceous Substrates Using Light Flash

1
Department of Environmental Health Sciences, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
2
Department of Occupational and Environmental Health, University of Oklahoma Health Sciences Center, Oklahoma, OK 73126, USA
3
Department of Physics, National University of San Luis, San Luis D5700HHW, Argentina
*
Author to whom correspondence should be addressed.
Academic Editor: Maria Filipa Ribeiro
Nanomaterials 2022, 12(4), 662; https://doi.org/10.3390/nano12040662
Received: 13 January 2022 / Revised: 6 February 2022 / Accepted: 14 February 2022 / Published: 16 February 2022
Millions of workers are occupationally exposed to volatile organic compounds (VOCs) annually. Current exposure assessment techniques primarily utilize sorbent based preconcentrators to collect VOCs, with analysis performed using chemical or thermal desorption. Chemical desorption typically analyzes 1 µL out of a 1 mL (0.1%) extraction volume providing limited sensitivity. Thermal desorption typically analyzes 100% of the sample which provides maximal sensitivity, but does not allow repeat analysis of the sample and often has greater sensitivity than is needed. In this study we describe a novel photothermal desorption (PTD) technique to bridge the sensitivity gap between chemical desorption and thermal desorption. We used PTD to partially desorb toluene from three carbonaceous substrates; activated carbon powder (AC-p), single-walled carbon nanotube (SWNT) powder (SWNT-p) and SWNT felts (SWNT-f). Sorbents were loaded with 435 ug toluene vapour and irradiated at four light energies. Desorption ranged from <0.007% to 0.86% with a single flash depending on substrate and flash energy. PTD was significantly greater and more consistent in SWNT-f substrates compared to AC-p or SWNT-p at all irradiation energies. We attribute the better performance of SWNT-f to greater utilization of its unique nanomaterials properties: high thermal conductivity along the nanotube axis, and greater interconnection within the felt matrix compared to the powdered form. View Full-Text
Keywords: photothermal desorption; toluene; carbonaceous substrates; thermal desorption; carbon nanotubes photothermal desorption; toluene; carbonaceous substrates; thermal desorption; carbon nanotubes
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MDPI and ACS Style

Floyd, E.L.; Oh, J.; Sapag, K.; Oni, T.M.; Shedd, J.S.; Lungu, C.T. Photothermal Desorption of Toluene from Carbonaceous Substrates Using Light Flash. Nanomaterials 2022, 12, 662. https://doi.org/10.3390/nano12040662

AMA Style

Floyd EL, Oh J, Sapag K, Oni TM, Shedd JS, Lungu CT. Photothermal Desorption of Toluene from Carbonaceous Substrates Using Light Flash. Nanomaterials. 2022; 12(4):662. https://doi.org/10.3390/nano12040662

Chicago/Turabian Style

Floyd, Evan L., Jonghwa Oh, Karim Sapag, Toluwanimi M. Oni, Jacob S. Shedd, and Claudiu T. Lungu. 2022. "Photothermal Desorption of Toluene from Carbonaceous Substrates Using Light Flash" Nanomaterials 12, no. 4: 662. https://doi.org/10.3390/nano12040662

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