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HIGHLY EFFICIENT ADSORPTIVE REMOVAL OF URANYL IONS BY A NOVEL GRAPHENE OXIDE REDUCED BY ADENOSINE 5/- MONOPHOSPHATE (RGO-AMP)

Abstract

Graphene oxide reduced by adenosine 5/- monophosphate (RGO-AMP) has been developed as a smart nanoscale adsorbent for unprecedented high removal of uranyl ions from aqueous medium. Amine/amide and phosphate groups of AMP are grafted in the graphene oxide structure by reducing the carboxylic acid groups of GO to facilitate stronger affinity for interacting with uranyl ions. An array of characterization techniques, e.g., Fourier transformed infrared spectroscopy, Raman Spectroscopy, X-ray photoelectron spectroscopy (XPS), zeta potential and BET surface area measurements confirmed functionalization of graphene oxide by AMP. The uranyl ion adsorption on RGO-AMP was qualitatively revealed from 2D elemental mapping recorded by field emission scanning electron microscopy (FE-SEM) coupled with energy dispersive X-ray analysis (EDX) and XPS analysis and quantified by inductively couple plasma optical emission spectroscopy (ICP-OES). The adsorption followed pseudo second order kinetic model and Langmuir adsorption isotherm, which revealed adsorption capacity (qmax) of 3024 mg/g corresponding to 93% removal of uranyl ions in 240 s at an optimized adsorbent dose of 5 mg per 100 mL adsorbate solution taken at pH 6. This method exhibited high urnyl ion selectivity in the presence of interfering cations, viz. Al3+, Cd2+, Co2+, Cu2+, Fe2+, Hg2+, Pb2+, Mn2+, Zn2+, Ni2+. The uranyl ion adsorption was thermodynamically favourable, spontaneous and endothermic in nature, while the XPS studies highlighted probable adsorption mechanism. The sustainability of RGO-AMP as an adsorbent has been demonstrated by showing regeneration and re-usability of the adsorbent for 5 cycles.

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Publication details

The article was received on 09 Oct 2018, accepted on 28 Nov 2018 and first published on 28 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA09746A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    HIGHLY EFFICIENT ADSORPTIVE REMOVAL OF URANYL IONS BY A NOVEL GRAPHENE OXIDE REDUCED BY ADENOSINE 5/- MONOPHOSPHATE (RGO-AMP)

    R. K. DUTTA, A. Shaida, K. Singla and D. Das, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA09746A

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