Green Synthesized Fluorescent Carbon Dots from Momordica charantia for Selective and Sensitive Detection of Pd2+ and Fe3+

A facile and rapid fluorescent sensing system for palladium ion (Pd2+) and iron ion (Fe3+) has been established based on carbon dots (CDs) using fresh Momordica charantia as the sole precursor via a one-step hydrothermal treatment. The added Pd2+ and Fe3+ lead to the fluorescence quenching of CDs due to the static quenching effect (SQE). Such fluorescence response can be quenched by Pd2+ and Fe3+ in the linear ranges of 0-325 mu M and 0-150 mu M. Meanwhile, this sensing system exhibits good selectivity and sensitivity toward Pd2+ and Fe3+ over other analytes with low detection limits of 0.348 mu M and 0.175 mu M, respectively. Furthermore, the proposed sensing system has been successfully used for Pd2+ and Fe3+ in tap and environmental water and the recoveries range from 96.25 % to 107.3 %. The results mentioned above demonstrate its great promise as a practical platform for Pd2+ and Fe3+ sensing in aqueous media.