Zinc metal–organic framework with 3-pyridinecarboxaldehyde and trimesic acid as co-ligands for selective detection of Cr (VI) ions in aqueous solution

Enoch Kwasi Adotey, Mehdi Amouei Torkmahalleh, Mannix P. Balanay

2020

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DOI 10.1088/2050-6120/abb364
Data confidence 70 medium
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Abstract

Abstract There is an increasing need for the development of probes for the detection of hexavalent chromium since it is a known carcinogen, which can cause adverse effects on human health. Metal-organic frameworks (MOFs) have shown successful detection and removal of hazardous substances from aqueous media. This work presents the use of simple organic ligands such as 3-pyridinecarboxaldehyde and trimesic acid with Zn(II) ion to fabricate a new MOF that exhibits sensitive and selective luminescence quenching response towards CrO 4 2− and Cr 2 O 7 2− species in aqueous solution. The MOF showed a detection limit of 0.67 μ M (0.078 ppm) as CrO 4 2− species and 1.91 μ M (0.41 ppm) as Cr 2 O 7 2− species. Results reveal that the as-synthesized MOF could serve as a good luminescent sensor for CrO 4 2− and Cr 2 O 7 2− species in the contaminated aqueous phase.