Novel nanoscale Yb-MOF used as highly efficient electrode for simultaneous detection of heavy metal ions.

It is essential to develop new nanomaterials able to improve sensing performance of electrochemical sensors for determination of heavy metal pollutants. In this work, a novel nanoscale metal–organic-framework material (Yb-MOF) with Ytterbium (Yb) rare-earth metal core and benzenetricarboxylic (BTC) ligands was prepared in aqueous conditions using hydrothermal approach. The results have revealed highly porous structure of the as-synthesized material with specific active area up to 1166 m² g⁻¹. A sensing platform was then constructed by drop-casting Yb-MOF onto glassy carbon electrode for detection of two most commonly found heavy metal ion pollutants (Cd²⁺ and Pb²⁺) in water sources. The nanoporous structure of Yb-MOF is very profitable to the selective preconcentration of targeted metal ions. The detection limits were estimated to be 3.0 ppb, 1.6 ppb for Cd²⁺ and Pb²⁺ species, respectively. This work provides a new electrochemical sensing platform for fast and sensitive in-situ detection of water contaminants. [ABSTRACT FROM AUTHOR]