Graphene oxide-based novel MOF nanohybrid for synergic removal of Pb (II) ions from aqueous solutions: Simulation and adsorption studies

Singh, S and U, B and Kumar Naik, TSS and Behera, SK and Khan, NA and Singh, J and Singh, L and Ramamurthy, PC (2023) Graphene oxide-based novel MOF nanohybrid for synergic removal of Pb (II) ions from aqueous solutions: Simulation and adsorption studies. In: Environmental Research, 216 .

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Abstract

Heavy metals represent a considerable threat, and the current study deals with synthesizing a novel MOF nanocomposite by intercalating graphene oxide (GO) and linker UiO-66-NDC. It was shown that UiO-66-NDC/GO had enhanced the removal efficiency of Pb (II) ions at pH 6. The adsorption kinetics data followed the PSO (Type 2) representing chemisorption. Adsorption data were also fitted with three different isotherms, namely Temkin, Freundlich, & Langmuir, and the Temkin model exhibited the best correlation (R2 0.99), representing the chemisorption nature of the adsorption process. The maximum adsorption capacity (qmax) of Pb (II) ions using Langmuir was found to be 254.45 mg/g (298 K). The Pb (II) adsorption process was confirmed to be exothermic and spontaneous as the thermodynamic parameters H° and G° were determined to have negative values. MOF nanocomposite also represents significant reusability for up to four regeneration cycles using 0.01 M HCl; for the next four, it works quite efficiently after regeneration. Meanwhile, the simulation findings confirm the superior dynamic stability (∼08 times) of the MOF nanocomposite as compared to the GO system. The removal of Pb (II) from simulated wastewater samples using a super nano-adsorbent using a MOF nanocomposite is described here for the first time.

Item Type:	Journal Article
Publication:	Environmental Research
Publisher:	Academic Press Inc.
Additional Information:	The copyright for this article belongs to Academic Press Inc.
Keywords:	adsorbent; graphene oxide; lead; metal organic framework; nanocomposite, adsorption; adsorption kinetics; algorithm; aqueous solution; Article; chemical composition; chemisorption; controlled study; desorption; Fourier transform infrared spectroscopy; geometry; isotherm; kinetics; pH; precipitation; Raman spectrometry; regeneration; scanning electron microscopy; simulation; structure analysis; temperature; thermodynamics; wastewater; X ray diffraction
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Water Research
Date Deposited:	29 Dec 2022 06:16
Last Modified:	29 Dec 2022 06:16
URI:	https://eprints.iisc.ac.in/id/eprint/78611

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