Abstract
A reusable, low–cost, and convenient ethylenediamine (EDA)–bound magnetite nanoparticles (MNPs)–based colorimetric sensor has been developed for dual function colorimetric determination of nitroaromatic explosives such as TNT and tetryl. Colorimetric detection of analytes may occur through two independent routes: (1) nano−Fe3O4− EDA− NH2 as σ−donor may interact with the σ− and π−acceptor aromatic−poly(NO2) groups to produce a colored charge−transfer (CT) complex; (2) nano−Fe3O4−EDA−NH2 as a Fenton-type nanozyme may generate reactive species that comprise hydroxyl radicals (•OH) with H2O2 to oxidize 3,3′,5,5′–tetramethylbenzidine (TMB) to a blue-colored diimine (oxTMB−TMB) CT complex, where this color is bleached with TNT/tetryl because of donor−acceptor interactions between the explosive –NO2 groups and the –NH2 group of Fe3O4−EDA nanoparticles of restricted nanozyme activity. Both methods can quantify TNT well below the EPA recommended TNT residential screening level in soil, LOD being in the micromolar range. As EDA was covalently bound to MNPs, the same sensor can be separately reused six times for TNT and eight times for tetryl determination, using method (1). Common metal ions, anions, energetic materials, several camouflage materials, and soil components such as humates did not interfere with the nanosensor performance for TNT and tetryl. The combination of charge−transfer and nanozyme ability of Fe3O4− EDA−NH2 nanoparticles may bring a new approach to dual function colorimetric sensor design. To the best of our knowledge, this is the first dual function colorimetric sensor for TNT and tetryl using the same nanoparticles as sensing elements in two different detection systems involving either formation or bleaching of colored species.
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15 September 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00604-021-04955-2
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Acknowledgments
The authors wish to express their gratitude to the Ministry of National Defence, Office of Technical Services, and to the Mechanical & Chemical Industry Corporation (MKEK) of Turkey for the donation of nitro and composite explosive samples. The authors extend their thanks to Istanbul University-Cerrahpaşa Research Fund (IUC BAP Unit) for the support given to Ph.D. Thesis Project–33833.
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Yardımcı, B., Koç, Ö.K., Üzer, A. et al. Ethylenediamine-bound magnetite nanoparticles as dual function colorimetric sensor having charge transfer and nanozyme activity for TNT and tetryl detection. Microchim Acta 188, 228 (2021). https://doi.org/10.1007/s00604-021-04877-z
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DOI: https://doi.org/10.1007/s00604-021-04877-z