Two dimensional Co-based metal organic framework for selective adsorption of Congo red from wastewater

Metal organic Frameworks (MOFs) are promising candidates for adsorptive removal of dyes. Nevertheless, the synthesis of crystalline MOFs is a challenging task in achieving selective dye removal while ensuring efficient reusability. Herein, Co-MOF was synthesized by the solvothermal method and investigated using X-ray single crystallography, PXRD, IR and thermogravimetric analysis. Moreover, Co-MOF exhibits excellent removal efficiency towards Congo red. The maximum adsorption of Congo red by Co-MOF after optimizing parameters such as the effect of dye concentration, adsorbent dosages and pH was reached 974.86 mg/g. It is observed that the adsorption process follows the pseudo-second order kinetics and the adsorption isotherm fits well with the Langmuir model indicating complex adsorption process. The H-bonding, π-π interaction and electrostatic interaction play a crucial role in the adsorption mechanism with a significant recycle performance of 879.85 mg/g even after five cycles, showing potential application in wastewater treatment and developing a new class considering sustainable environment.