A family of kojic acid derivatives aimed to remediation of Pb < sup > 2+ < /sup > and Cd < sup > 2 < /sup >

Ecotoxicol Environ Saf. 2023 Sep 14;264:115470. doi: 10.1016/j.ecoenv.2023.115470. Online ahead of print.ABSTRACTThe present work analyzes the complex formation ability towards Pb2+ and Cd2+ of a series of kojic acid derivatives that join the chelating properties of the pyrone molecules and those of polyamines, with the aim of evaluating how the different effects of oxygen and nitrogen coordinating groups act on the stability of metal complexes. Experimental research is carried out using potentiometric and spectrophotometric techniques supported by 1H and 13C NMR spectroscopy and DFT calculations. Actually, a different coordination mechanism toward Pb2+ and Cd2+ was proved: in the case of Pb2+, coordination takes place exclusively via the oxygen atoms, while the contribute of the nitrogen atoms appears relevant in the case of Cd2+. Lead complexes of all the studied ligands are characterized by significantly stronger stability than those of cadmium. Finally, on the basis of the measured complex formation stabilities, some of the proposed molecules seems promising effective ligands for lead and cadmium ion decorporation from polluted soils or waste waters.PMID:37716075 | DOI:10.1016/j.ecoenv.2023.115470
Source: Ecotoxicology and Environmental Safety - Category: Environmental Health Authors: Source Type: research