Sensitive and selective fluorometric determination and monitoring of Zn2+ ions using supermicroporous Zr-MOFs chemosensors
M. El-Sewify, Islam; Shenashen, Mohamed A.; Shahat, Ahmed; Selim, Mahmoud M.; Khalil, Mostafa M.H.; El-Safty, Sherif A.;
Abstract
We report the fabrication of water-stable, supermicroporous fluorescent chemosensors (MFCs) using Zr-based metal-organic frameworks (MOFs) as scaffolds for selective fluorescent determination of the ultra-traces of heavy metals, such as Zn2+ ions from water resources. The MFCs structures was developed by direct decoration of hydrophobic fluorescent probes (2,2′-((1Z,12Z)-5,9-dithia-2,12-diazatrideca-1,12-diene-1,13 diyl) diphenol), (S1) into the Zr-based metal-organic frameworks (MOFs). Significantly, the MFCs design with uniform super-microgroove pores, long-range intergrowing crystal, and dense decoration of fluorescent probes, leading to create active hook surface sheaths as sensitive and selective chemosensors platforms for ultra-trace monitoring of Zn2+ ions. The MFCs supermicro-crystal structures have shown synergistic enhancement in selective sensing assay associated with low-detection limit up to part-per-billion (ppb), wide-range determination (0.5 ppb to 2000 ppb) and fast response monitoring in the order of second during the binding of Zn2+ ion target. The selectivity of Zn2+ ions fluorometric sensing process in a heterogeneous mixture of inorganic cations and anions was mainly dependent on the structure of the fluorescent probe, pH condition, competitive ion system composition, and Zn-to-fluorescent probe binding procedure. Our developed MFCs showed a wide range of detection of Zn2+ ions with a considerably low detection limit of approximately 10−9 mol/L, in optimal working condition. The long-term stability of MFCs with fluorescent surface functionality enabled the practical and multiple reuse/cycles of Zn2+ ion determination.
Other data
Title | Sensitive and selective fluorometric determination and monitoring of Zn<sup>2+</sup> ions using supermicroporous Zr-MOFs chemosensors | Authors | M. El-Sewify, Islam ; Shenashen, Mohamed A.; Shahat, Ahmed; Selim, Mahmoud M.; Khalil, Mostafa M.H.; El-Safty, Sherif A. | Keywords | Chemosensors;Detection;Determination;Fluorescent;Supermicroporous;Zn ions 2+ | Issue Date | 1-Jun-2018 | Publisher | ELSEVIER | Journal | Microchemical Journal | Volume | 139 | Start page | 24 | End page | 33 | ISSN | 0026265X | DOI | 10.1016/j.microc.2018.02.002 | Scopus ID | 2-s2.0-85043308307 | Web of science ID | WOS:000433268700004 |
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