Enhanced adsorption of chromium heavy metal ions using a highly stable mesoporous Co/Ni bimetal-mixed metal-organic framework for effective remediation

A bimetallic Co/Ni-based metal-organic framework, [Co/Ni(μ3-tp)₂(μ2-pyz)₂], known as Co/Ni-MOF, was effectively synthesized employing an aqueous hydrothermal method. The MOF was arranged by combining blended O^- and N^- donor ligands, particularly terephthalic acid. A comprehensive characterization of the Co/Ni-MOF was performed utilizing different expository procedures, including XRD, FT-IR, TGA, and SEM equipment analyses. The synthesized Co/Ni-MOF was at that point utilized for the proficient adsorption of chromium ions from aqueous solutions with an ultrasonic bath. A few key parameters, like starting metal ion concentration, arrangement pH, contact time, and adsorbent dose, were systematically examined. Strikingly, the Co/Ni-MOF showed a high adsorption capacity of 277.78 mg g^-1 in less than 30 minutes at a pH of 7.3. The test adsorption information coordinated well with the pseudo-second-order dynamic demonstration (R² = 0.999), showing a chemisorption mechanism. Moreover, the adsorption isotherms of Cr (VI) ions adjusted flawlessly with the Langmuir model, suggesting monolayer adsorption on a uniform surface. Thermodynamic studies uncovered that the adsorption of chromium ions onto the adsorbent was unconstrained. These results emphasize the promising adsorption potential and execution applications of the Co/Ni-MOF as a compelling material for the remediation of chromium from aqueous solutions. Therefore, all these results, in this study, Co/Ni MOF with terephthalic acid (tp) and pyrazine (pyz) linkers have been synthesized to remove chromium (VI) ions from wastewater. This study shows that mesoporous materials can play an important role in the selective and effective removal of heavy metal ions from wastewater.