Anti-Corrosion Performance of the Microporous Zif-8 Metal-Organic Frameworks Synthesized in the Presence of Various Metal-Node Containing Precursors in Saline Solution

Metal-organic frameworks (mof) have recently emerged as nanoporous materials which are composed of metal nodes and organic ligands. due to their remarkable properties, such as high surface area, ultra-low density, and thermal stability, they have been frequently utilized in versatile industries. zeolite imidazole framework-8 (zif-8) is one of the promising mofs comprising of zn cations and 2-methylimidazole in its structure with rhombic dodecahedra morphology. it has outstanding chemical stability in neutral media and also decomposes in acidic and basic media. in this report, the zif-8 micro-porous nanomaterials based on zinc gluconate (zng@zif-8) have been synthesized to incorporate gluconate as a corrosion inhibitor into the zif-8 structure and then its performance was compared with zinc nitrate-based zif-8. at room temperature, zng and 2-methylimidazole were dissolved in methanol separately. the zng solution was slowly dropped into the 2-methylimidazole solution. then, the turbid white liquid was separated by centrifugation and dried at 70 °c. the same way was done with zif-8. field emission scanning microscopy (fe-sem) has been used to compare the morphology of mofs. according to fe-sem, zif-8 particles based on zinc nitrate showed a rhombic dodecahedra structure, but zng@zif-8 showed irregular dodecahedra morphology due to gluconate loading into zif-8. eis was applied to evaluate the anti-corrosion behavior of the mofs exposed to 3.5%wt nacl solution. the nyquist plots revealed higher corrosion resistance of zng@zif-8 than zif-8 particles based on zinc nitrate during 72 hours, which confirms that the gluconate was successfully loaded into the zif-8 micro porosities and released gradually in nacl media [1]. although both mofs showed a declining trend after 48 hours, zng@zif-8 still has a higher value of impedance during immersion time.

Anti-corrosion Performance of the microporous ZIF-8 Metal-organic Frameworks Synthesized in the Presence of Various Metal-node Containing Precursors in saline solution

Metal-organic frameworks (MOF) have recently emerged as nanoporous materials which are composed of metal nodes and organic ligands. Due to their remarkable properties, such as high surface area, ultra-low density, and thermal stability, they have been frequently utilized in versatile industries. Zeolite imidazole framework-8 (ZIF-8) is one of the promising MOFs comprising of Zn cations and 2-methylimidazole in its structure with rhombic dodecahedra morphology. It has outstanding chemical stability in neutral media and also decomposes in acidic and basic media. In this report, the ZIF-8 micro-porous nanomaterials based on zinc gluconate (ZnG@ZIF-8) have been synthesized to incorporate gluconate as a corrosion inhibitor into the ZIF-8 structure and then its performance was compared with zinc nitrate-based ZIF-8. At room temperature, ZnG and 2-methylimidazole were dissolved in methanol separately. The ZnG solution was slowly dropped into the 2-methylimidazole solution. Then, the turbid white liquid was separated by centrifugation and dried at 70 °C. The same way was done with ZIF-8. Field emission scanning microscopy (FE-SEM) has been used to compare the morphology of MOFs. According to FE-SEM, ZIF-8 particles based on zinc nitrate showed a rhombic dodecahedra structure, but ZnG@ZIF-8 showed irregular dodecahedra morphology due to gluconate loading into ZIF-8. EIS was applied to evaluate the anti-corrosion behavior of the MOFs exposed to 3.5%wt NaCl solution. The Nyquist plots revealed higher corrosion resistance of ZnG@ZIF-8 than ZIF-8 particles based on zinc nitrate during 72 hours, which confirms that the gluconate was successfully loaded into the ZIF-8 micro porosities and released gradually in NaCl media [1]. Although both MOFs showed a declining trend after 48 hours, ZnG@ZIF-8 still has a higher value of impedance during immersion time.