Simultaneous Electrochemical Detection of Cd(II) and Pb(II) With a V2CTx MXene Modified Screen-Printed Electrode

High-precision and rapid screening of harmful heavy metal contaminants like cadmium and lead ions in water bodies plays an indispensable role in ecological supervision and human health maintenance. This study fabricates V 2 CT x doped screen-printed electrodes to realize concurrent electrochemical quantification of the two metallic ions in aquatic samples. The target V 2 CT x material was obtained through selective corrosion treatment on V 2 AlC raw material. Its surface structure and internal element dispersion state were analyzed with SEM and EDS characterization techniques. Under optimized experimental parameters, square wave anodic stripping voltammetry was adopted to carry out sample measurement. Independent testing yielded LOD of 1.01 μg/L for cadmium ions and 1.91 μg/L for lead ions, respectively. When the two ions were measured concurrently, the LOD reached 2.20 and 2.39 μg/L, respectively. The V 2 CT x /SPE possessed good anti-interference property, reusability, reproducibility, and favorable preservation stability. Real water sample recovery tests (mineral water and tap water) gave recoveries between 101% and 104%, confirming its practical applicability. The V 2 CT x /SPE holds great potential for on-site rapid detection of heavy metal ions owing to its disposability, low cost, and robust performance. Graphical This work constructs a V 2 CT x MXene-modified screen-printed electrode (SPE) for square wave anodic stripping voltammetry (SWASV) synchronous quantification of aqueous cadmium (II) (Cd 2+ ) and lead (II) (Pb 2+ ). After optimizing modifier doping ratio, deposition parameters and buffer pH, the fabricated V 2 CT x /SPE achieves favorable linearity (5–50 μg L −1 ) and low limits of detection (LOD).