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Zeolitic Imidazolate Framework-8 Nanoparticles for Rhodamine B Adsorption

[ Vol. 6 , Issue. 1 ]

Author(s):

Diogo P. Al Rodrigues, Meiry G.F. Rodrigues*, Patrícia F. Tomaz and Tellys L.A. Barbosa   Pages 66 - 73 ( 8 )

Abstract:


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 and ZIF-8.

Keywords:

Zeolitic imidazolate framework-8, nanoparticles, solvothermal synthesis, dye removal, Rhodamine B, adsorption, waste water.

Affiliation:

Development Laboratory of New Materials, Academic Unit of Chemical Engineering, Federal University of Campina Grande, Campina Grande, Development Laboratory of New Materials, Academic Unit of Chemical Engineering, Federal University of Campina Grande, Campina Grande, Department of Chemistry, State University of Paraíba, Campina Grande, Development Laboratory of New Materials, Academic Unit of Chemical Engineering, Federal University of Campina Grande, Campina Grande

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