Abstract
An amine-decorated zirconium based metal organic framework (MOF) UiO-66-NH2 with rod shape morphology was synthesized by solvothermal process using 2-aminoterephthalic acid as an organic linker. Crystallinity of synthesized MOF material was confirmed with PXRD technique. MOF was employed as selective and sensitive sensor for ultra-trace detection of 2,4,6-trinitrophenol (TNP) in aqueous matrix, even in coexistence with other competitive nitroaromatic analytes. High value of Stern-Volmer quenching constant Ksv (1.106 × 105 M− 1), plausible photoluminescent quenching efficiency (97.8%) and lower detection limit (0.95 µM/217ng mL− 1) ascertained extraordinary sensitivity of developed MOF for TNP. Density functional theory calculations and electrostatic interactions (i.e. ionic interaction, H-bonding and π-π interaction) indicated that electron and energy transfer processes play a key role in turn-off quenching response of UiO-66-NH2 sensor. Spiked real samples were analysed to validate the developed method, which satisfactorily established the developed MOF sensor as an efficient tool for analysis.
Graphical Abstract
Highlights
An amine-decorated zirconium based metal organic framework (UiO-66-NH2) was synthesised.
Developed sensor detected 2,4,6-trinitrophenol (TNP) in water samples.
Detection of TNP was done in presence of other potentially competitive nitroaromatic analytes.
Lower detection limit (0.95 µM/217ng mL− 1) ascertained extraordinary sensitivity of developed UiO-66-NH2 for TNP.
Electron and energy transfer processes justify the sensitivity of UiO-66-NH2 sensor for TNP.
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The authors are grateful to the Chemistry Department, Punjabi University, Patiala, for providing lab and instrument facilities.
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Rajpal Verma and Gaurav Dhingra: Conceptualization, Methodology, Data curation, Writing - original draft, Visualization, Validation. Manpreet Kaur, Deepika Garg and Irshad Mohiuddin: Project administration, Investigation, Writing - original draft, reviewing and editing. Ashok Kumar Malik: Investigation, Project administration, Supervision, Formal analysis, Writing - review and editing.
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Verma, R., Dhingra, G., Kaur, M. et al. Amine-decorated Zirconium Based Metal Organic Framework for Ultrafast Detection of 2,4,6-Trinitrophenol in Aqueous Samples. J Fluoresc 33, 2085–2098 (2023). https://doi.org/10.1007/s10895-023-03216-0
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DOI: https://doi.org/10.1007/s10895-023-03216-0