Zeolitic Imidazolate Framework-8 Nanoparticles for Rhodamine B Adsorption

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 important in the environmental area. Objective: This work presents the synthesis of metal-organic framework Zeolitic Imidazolate Framework-8 (ZIF-8) nanoparticles, characterization and then determine 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, infrared spectroscopy. To evaluate the capacity of the RhB, a pHinfluence and kinetic studies were determined. 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 average particle size 47 ± 4.6 nm. The removal percentage increases significantly when 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.

Nanocompósitos para a Adsorção de Fármacos: estudo e monitoramento tecnológico

“…Trata-se de uma MOF com elevada estabilidade que tem atraído grande interesse devido à gama de aplicações às quais pode ser submetida. Esse material exibe uma elevada área de superfície de 1400 m 2 /g, estabilidade térmica até 420 °C e diâmetros de poros relativamente elevado, de cerca de 11 Å (PARK et al, 2006;BARBOSA et al, 2021;RODRIGUES et al, 2020;RODRIGUES;BARBOSA;RODRIGUES;ZHANG et al 2016;ZHANG et al, 2018).…”

Tailoring fluorescent ZIF-8 nanostructures through calix[4]pyrrole modification: tunable size and enhanced organic micropollutant removal capacity

“…Conversely, the insolubility of BCCP-modified ZIF-8 in water could make it potentially valuable for organic micropollutant removal studies because previous research demonstrated that ZIF-8 could remove a cationic organic micropollutant, rhodamine B, with a high removal efficiency from the aqueous environment because of the affinity of imidazole groups to rhodamine B. 27,28 In our study, the organic micropollutant removal properties of both modified and non-modified ZIF-8 were evaluated with three distinct cationic organic micropollutants (Fig. 4): rhodamine B (RB), methylene blue (MB), and methyl violet 2B (MV).…”