Understanding the interactions of neptunium and plutonium ions with graphene oxide: Scalar-relativistic DFT investigations

Qun Yan Wu, Jian Hui Lan, Cong Zhi Wang, Yu Liang Zhao, Zhi Fang Chai, Wei Qun Shi

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Due to the vast application potential of graphene oxide (GO)-based materials in nuclear waste processing, it is of pivotal importance to investigate the interaction mechanisms between actinide cations such as Np(V) and Pu(IV, VI) ions and GO. In this work, we have considered four types of GOs modified by hydroxyl, carboxyl, and carbonyl groups at the edge and epoxy group on the surface, respectively. The structures, bonding nature, and binding energies of Np(V) and Pu(IV, VI) complexes with GOs have been investigated systematically using scalar-relativistic density functional theory (DFT). Geometries and harmonic frequencies suggest that Pu(IV) ions coordinate more easily with GOs compared to Np(V) and Pu(VI) ions. NBO and electron density analyses reveal that the coordination bond between Pu(IV) ions and GO possesses more covalency, whereas for Np(V) and Pu(VI) ions electrostatic interaction dominates the An-OG bond. The binding energies in aqueous solution reveal that the adsorption abilities of all GOs for actinide ions follow the order of Pu(IV) > Pu(VI) > Np(V), which is in excellent agreement with experimental observations. It is expected that this study can provide useful information for developing more efficient GO-based materials for radioactive wastewater treatment. (Figure Presented).

Original languageEnglish (US)
Pages (from-to)10273-10280
Number of pages8
JournalJournal of Physical Chemistry A
Volume118
Issue number44
DOIs
StatePublished - Nov 6 2014

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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