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Formation of structural defects within Fe-UiO-66 for effective adsorption of arsenic from water

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Abstract

In this study, mesoporous metal organic framework (UiO-66-M) and Fe-UiO-66-M were synthesized by the thermal solvent method at 120 °C and ambient pressure. The as-synthesized Fe-UiO-66-M samples exhibit a small nanoparticle size (20–30 nm), high surface area (1040 m2/g) and medium pore diameter (5.35–5.95 nm). The TGA, EDS and XPS analysis results demonstrated the formation of missing bonding defects in Fe-UiO-66-M and UiO-66-M samples. The UiO-66-M and Fe-UiO-66-M samples were applied to adsorb As(V) over a wide pH range (pH = 1–11). Results have shown that As(V) adsorption capacity reached 337 mg/g and the removal rate of As(V) reached 94.14% at optimal pH (pH = 3). The factors which affected the As(V) adsorption process, such as initial As(V) concentration, pH, adsorption mechanism and adsorption kinetics, were also studied. To our knowledge, the As(V) adsorption capacity of Fe-UiO-66-M material was higher than that of previously reported adsorbents (5–303 mg/g). The high As(V) adsorption efficiency of Fe-UiO-66-M materials was due to the porous crystal structure, and the formation of a mesostructure with a large pore size is favorable for the diffusion process dispersion and contact of the reactants. In addition, the defect formation in the UiO-66 structure increased the electrostatic interaction and the construction of As–O–Zr and Fe–O–As bonds in the UiO-66 structure, thus promoting the As adsorption process of the synthesized material.

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Acknowledgements

This research is funded by Intiture of Chemistry-Vietnam Academy of Science and Technology (VAST) under Grant Number CSCL06.05/22-23.

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Correspondence to M. B. Nguyen.

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Editorial responsibility: Mohamed F. Yassin.

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Hai, N.D., Nguyen, M.B., Tan, V.M. et al. Formation of structural defects within Fe-UiO-66 for effective adsorption of arsenic from water. Int. J. Environ. Sci. Technol. 20, 10075–10088 (2023). https://doi.org/10.1007/s13762-022-04712-9

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  • DOI: https://doi.org/10.1007/s13762-022-04712-9

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