چارچوب‌هاي دو فلزي فلز-آلي زيركونيوم-هافنيوم: تهيه آب‌گرمايي و مطالعه رفتار آن‌ها با روش‌هاي الكتروشيميايي

Zirconium-Hafnium Bimetallic Metal-Organic Frameworks: Hydrothermal Synthesis an‎d Studies of Their Behavior by Electrochemical Methods

شيمي تجزيه

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 (T100 °C & t12 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).

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