Green Synthesized Fluorescent Carbon Dots from <i>Momordica charantia</i> for Selective and Sensitive Detection of Pd <sup>2+</sup> and Fe <sup>3+</sup>
Dong Yan, Yudong Zhang, Shumin Zhi, Xueyun Yang, Cheng Yao
Abstract
Abstract A facile and rapid fluorescent sensing system for palladium ion (Pd 2+ ) and iron ion (Fe 3+ ) has been established based on carbon dots (CDs) using fresh Momordica charantia as the sole precursor via a one‐step hydrothermal treatment. The added Pd 2+ and Fe 3+ lead to the fluorescence quenching of CDs due to the static quenching effect (SQE). Such fluorescence response can be quenched by Pd 2+ and Fe 3+ in the linear ranges of 0–325 μM and 0–150 μM. Meanwhile, this sensing system exhibits good selectivity and sensitivity toward Pd 2+ and Fe 3+ over other analytes with low detection limits of 0.348 μM and 0.175 μM, respectively. Furthermore, the proposed sensing system has been successfully used for Pd 2+ and Fe 3+ 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 Pd 2+ and Fe 3+ sensing in aqueous media.