SYNTHESIS OF METAL-ORGANIC FRAMEWORK Ni-MOF USING 2-METHYLIMIDAZOLE AND APPLICATION FOR ADSORPTION OF ORGANIC PIGMENTS

Among the metal-organic framework materials, Ni-MOF is considered one of the promising materials due to its high porosity and structure containing active transition metal ions. In particular, by changing the organic ligands and synthesis conditions, organic framework nickel materials with different structures and properties have been synthesized and evaluated for applicability in many fields. In this study, the metal-organic framework Ni-MOF was synthesized by solvothermal approach using the organic ligand 2-methylimidazole. The obtained material was characterized using infrared (IR) spectroscopy, X-ray diffraction (XRD), EDX spectroscopy and SEM images. The results of analyzing the physico-chemical properties of materials showed that the obtained material has a porous structure with a relatively low crystallinity. The surface morphology, elemental composition and crystallinity depend on the nature of the nickel salt and the molar ratio of nickel/2-methylimidazole ligand. The synthesized material was used as an adsorbent for the removal of MB and RhB from aqueous solution. The results showed that the synthesized Ni-MOF material has good adsorption capacity of organic pigments. The influence of synthesis conditions, including the molar ratio of nickel salt and 2-methylimidazole, synthesis temperature and synthesis time, on the adsorption capacity of Ni-MOF materials was studied. It was shown that Ni-MOF material synthesized by solvothermal method using nickel nitrate and 2-methylimidazole ligand with a molar ratio of 1:8, calcined at 180 degrees C after 8 hours, has the best adsorption ability for the removal of pigment from aqueous solution. The adsorption capacity of Ni-MOF for MB and RhB removal reached 105.45 mg/g and 51.48 mg/g, respectively.