Electrochemical Detection of Cr2O7 2− in Wastewater Using GAs/Bi-BDC-MOFs Modified Glassy Carbon Electrodes

In this study, GAs/Bi-BDC composite materials were synthesized and applied to modify glassy carbon electrodes for the construction of an electrochemical sensing system to detect Cr 2 O 7 2− . Comparative results showed that GAs/Bi-BDC/GCE exhibited excellent performance in detecting hexavalent chromium. The detection sensitivities of GAs/GCE and Bi-BDC/GCE were 0.0043 and 0.0086 μA/μg/l, with limits of detection (LODs) of 11.58 and 5.79 μg l −1 , respectively. In contrast, GAs/Bi-BDC/GCE demonstrated a sensitivity of 0.014 μA/μg/l and an LOD of 3.6 μg l −1 . This study indicates a significant synergistic effect between GAs and Bi-BDC, suggesting the composite material’s promising application prospects in heavy metal ion detection.