Background: Dye removal from effluents is one of the major problems faced in the
world. It is a very important environmental issue and it is crucial to solve this problem. In this
sense, ZIFs are increasingly becoming important in the environmental area.
Objective: This work presents the synthesis of metalorganic framework Zeolitic Imidazolate Framework-
8 (ZIF-8) nanoparticles, characterization, and then determines the potential to remove Rhodamine
B (RhB) from an aqueous solution.
Methods: ZIF-8 was synthesized under solvothermal treatment at 25°C and it was characterized by
X-ray diffraction, N2 adsorption-desorption, scanning electron microscopy, and infrared spectroscopy.
To evaluate the capacity of the RhB, pH-influence and kinetic studies were carried out. The
pseudo first- and second-order kinetic models were used to describe the kinetic data, and the rate
constants were evaluated.
Results: ZIF-8 had an average particle size of 47 ± 4.6 nm. The removal percentage increased significantly
when the pH was in the range of 7.0-9.0. A pseudo-second-order kinetic of 13.00 mg/g
was found for the RhB removal. The adsorption capacity at equilibrium was found to be 11.8 mg/g.
Conclusion: According to the characterization results, the ZIF-8 synthesis was effective and produced
a crystalline material. The ZIF-8 presented an affinity to the RhB dye. A pseudo-second-
order kinetic model represented well the mechanism of interaction involved during RhB adsorption