چكيده لاتين
Nanostructures of bimetallic zirconium hafnium metal-organic framework (MOF 808(Zr Hf) HT) are synthesized for the first time, using modulated hydrothermal (MHT) method under facile conditions (T100 °C & t12 h) and without using DMF. Then, electrochemical behavior of pristine as well as carbonized MOF 808(Zr Hf) HT was studied by using different methods including surface and solution analytical techniques, electrochemical impedance spectroscopy (EIS), and linear sweep voltammetry (LSV). Overall, analysis of the data obtained based on X ray photoelectron spectroscopy (XPS), Inductively coupled plasma-atomic emission spectroscopy (ICP-AES), Fourier transform infrared spectroscopy (FT IR), Field emission scanning electron microscopy (FESEM), X ray diffraction (XRD) and Thermogravimetric analysis (TGA) supported formation of pristine and carbonized MOF 808(Zr Hf) HT nanostructures. The surface and solution studies in conjunction with electrochemical data revealed interesting features of the MOF 808(Zr Hf) HT nanostructures such as physicochemical stability and wide potential window, which in turn are essential for fundamental and industrial applications. For example, the results obtained through LSV on GCEs modified with MOF 808(Zr Hf) HT show a wide potential window of 2.79 & 2.83V for pristine and carbonized forms, respectively. This property is important for the applications in charge storage, electroanalytical chemistry, and protection of the metals surface against corrosion and environmental effects. Here, application of the MOF 808(Zr Hf) HT system was studied successfully for three different cases including (i) application of system as a corrosion inhibitor for 304 SSE in a 3.5%wt NaCl solution, where a significant shift in the corrosion potential towards the anodic region (502.05 mV for the carbonized sample at a concentration of 300 ppm) was observed, (ii) selective detection of dopamine (DA), where a specific response was observed for DA in the presence of a high concentration of ascorbic acid (1 mM, AA), and (iii) adsorption of heavy metal ions, Cu2+, Cd2+, and Pb2+ both separately and in mixture, with concentrations of 100 μM in acetate buffer solution (pH=5), and then detecting them via differential pulse voltammetry (DPV).
