Synthesis of novel Ag@ZIF-67 rhombic dodecahedron for enhanced adsorptive removal of antibiotic and organic dye

Abstract

Ag@ZIF-67 was successfully prepared by using a facile and fast method at room temperature and characterized by a variety of techniques. Results indicate that prepared Ag@ZIF-67 contains a very beautiful morphology with a great active specific surface area than solo ZIF-67. The prepared Ag@ZIF-67 contains a greater pore size, which is 1.564 nm with increased functional sites. The adsorption performance of Ag@ZIF-67 was further studied with the removal of Minocycline (MC) and methyl orange (MO) from polluted water. Various adsorption parameters, such as contact time, adsorbent dosage, pH, and initial concentrations of MC and MO, were optimized. The kinetics parameters of the adsorption process were determined by applying the pseudo first-order kinetic model (PFO) and pseudo second-order (PSO) kinetic model. In the case of MC, adsorption isotherm data matched well with Freundlich as compared to Langmuir and Temkin model. While in the case of MO, adsorption isotherm data followed the Langmuir model as compared to the Freundlich and Temkin model. Ag@ZIF-67 was found to be an efficient adsorbent for the adsorption of MC and MO, having 938.4 mg/g and 994.6 mg/g adsorption capacity, which is higher than reported adsorbents.