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Issue 11, 2018
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Easy sensing of lead and zinc in water using smart glass based on cationic porphyrin layers

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Abstract

Spontaneous formation of meso-tetra(N-methyl-4-pyridyl)porphyrin (H2T4) layers on a glass surface is proven effective to assess the sensitivity and selectivity of solid chemosensors for spectrometric detection (at sub-ppm levels) of Pb2+ and Zn2+ ions in water. The obtained results, achieved by a simple, low cost and repeatable non-covalent glass surface functionalization, are suitable for application in water management and control where detection of contaminants at micromolar or even submicromolar concentrations is required. The most striking result is represented by the high sensitivity towards Zn2+ ions, unusual for cationic porphyrins in solution, herein associated with macrocycle ring distortion caused by immobilization onto a glass surface. Moreover, the co-presence of Pb2+ and Zn2+ in water promotes a trans-metalation process responsible for a peculiar fingerprint of contaminant abundance in solution within the selected (short) analysis time. The defined sensing strategy is extendible to other metal ions, thus making these H2T4 functionalised glass slides ideal for the rapid on site-real time detection of heavy metal ions in water.

Graphical abstract: Easy sensing of lead and zinc in water using smart glass based on cationic porphyrin layers

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Publication details

The article was received on 12 Feb 2018, accepted on 05 Apr 2018 and first published on 05 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ00736E
Citation: New J. Chem., 2018,42, 8717-8723
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    Easy sensing of lead and zinc in water using smart glass based on cationic porphyrin layers

    C. M. A. Gangemi, G. Ognibene, R. Randazzo, A. D’Urso, R. Purrello and M. E. Fragalà, New J. Chem., 2018, 42, 8717
    DOI: 10.1039/C8NJ00736E

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