Electrochemical Determination of Lead and Copper Ions by Using UiO-66/TiO2-Carbon Paste Electrode

In this study, carbon paste fabricated and modified a novel sensitive voltammetric sensor based on UiO-66/TiO2 MOF nanocomposite through the solvothermal method. The electrode surface morphology and enhancement study were performed through FESEM and FT-IR. The electrochemical behavior of the modified electrode was evaluated using cyclic voltammetry in the [Fe (CN)6]3-/4-solution and represented good electrocatalytic activity due to the synergy result of TiO2 and UiO-66. For quantitative analyses, differential pulse voltammetry was used under optimal conditions. The calibration curves show linear response in the concentration range of 2-100 mu M with the lowest limit of detection of 0.851 mu M and 0.436 mu M were obtained for Pb2+ and Cu2+, respectively. The sensor exhibited high sensitivity and selectivity, good reproducibility, desirable stability, and excellent performance in real samples.