Ultrasensitive fluorescent carbon dot sensor for quantification of soluble and insoluble Cr(VI) in particulate matter
Adotey E.K. Amouei Torkmahalleh M. Tastanova L. Bekeshev A. Shah D. Hopke P.K. Lee W. Balanay M.P.
15 January 2024Elsevier B.V.
Journal of Hazardous Materials
2024#462
This study investigates advanced functional materials to address the need for practical and affordable analytical techniques for monitoring large amounts of insoluble Cr(VI). N,S-doped fluorescent carbon dots (f-CDs) were fabricated through microwave synthesis, with an average diameter of 10 nm. These f-CDs were explored as potential sensors for detecting Cr(VI) in ambient particulate matter (PM). Laboratory experiments yielded positive results, showing average recoveries of 106.0%, 102.3%, 96.4%, and 101.7% for PbCrO4, BaCrO4, CaCrO4, and (NH4)2CrO4, respectively. Applying the fluorescence method to field PM samples, a method detection limit (MDL) of 0.32 ng/m3 for total Cr(VI) quantification was achieved. The fluorescence decay of carbon dots remained stable over time, suggesting that Cr(VI) quenching primarily occurred due to the internal filter effect through a static quenching mechanism. These f-CDs exhibited advantageous properties, including affordability, solubility, luminescence, and sensitivity, positioning them as a promising alternative for Cr(VI) detection in ambient air particulates. This study contributes to further developing carbon-based functional materials for detecting metallic air pollutants.
Air Quality , Insoluble chromium , Luminescence, Sensors , Particulate matter
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Department of Chemical and Materials Engineering, Nazarbayev University, Astana, 010000, Kazakhstan
Division of Environmental and Occupational Health Sciences, School of Public Health, University of Illinois at Chicago, Chicago, 60612, IL, United States
K. Zhubanov Aktobe University, A. Moldagulova Ave., 34, Aktobe, 030000, Kazakhstan
Department of Public Health Sciences, University of Rochester School of Medicine and Dentistry, Rochester, 14642, NY, United States
Department of Civil and Environmental Engineering, Nazarbayev University, Astana, 010000, Kazakhstan
Department of Chemistry, Nazarbayev University, Astana, 010000, Kazakhstan
Department of Chemical and Materials Engineering
Division of Environmental and Occupational Health Sciences
K. Zhubanov Aktobe University
Department of Public Health Sciences
Department of Civil and Environmental Engineering
Department of Chemistry
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