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Exploring Functionalized Titania for Task Specific Application on Efficient Separation of Trivalent f-block Elements

Abstract

Functionalized titania, obtained by grafting dipicolinic acid functionality, was explored for task specific application of highly efficient separation of trivalent f-block elements. Sorption mechanism, kinetcis and complexation have been investigated in detail. The chemisorption followed Langmiur isotherm and pseudo 2nd order rate kinetics. The Ti-2p3/2, O-1s and C-1s peaks in XPS spectra indicate the augmentation of functionalization, while Eu-4d peak at 136.5 eV confirms the complexation. EXAFS and XANES spectra for Eu L3-edge and Ti K-edge have been explored to characterize the sorbent and its complexation with Eu3+/Am3+. The peak at 1.9 Å was assigned to two oxygen coordination cells at 2.19 Å and 2.39 Å with approximately two and eight oxygen atoms, respectively, whereas peak at 2.5 Å relates to the coordination peak for Eu:DPA. The sorbent was found to have high radiological stability. DFT calculation optimized the structures of the Eu3+/Am3+ complexation with funcitionalized titania as M(NO3)3.L species. The Gibb's energy for aqueous phase complexation of Eu3+ and Am3+ was found to be -135.1 and -129.9 kcal/mol, respectively.

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Article information


Accepted
10 Mar 2020
First published
11 Mar 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Exploring Functionalized Titania for Task Specific Application on Efficient Separation of Trivalent f-block Elements

S. Pahan, A. Sengupta, A. K. Yadav, S. N. Jha, D. Bhattacharyya, M. A. Sheikh, P. N. Khan, A. K. Debnath, D. Banerjee, T. Vincent, S. Manohar and C. Kaushik, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ01014F

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