Periodic density functional theory investigation of the uranyl ion sorption on three mineral surfaces: a comparative study.
Canister integrity and radionuclides retention is of prime importance for assessing the long term safety of nuclear waste stored in engineered geologic depositories. A comparative investigation of the interaction of uranyl ion with three different mineral surfaces has thus been undertaken in order to point out the influence of surface composition on the adsorption mechanism(s). Periodic DFT calculations using plane waves basis sets with the GGA formalism were performed on the TiO(2)(110), Al(OH)(3)(001) and Ni(111) surfaces. This study has clearly shown that three parameters play an important role in the uranyl adsorption mechanism: the solvent (H(2)O) distribution at the interface, the nature of the adsorption site and finally, the surface atoms' protonation state.
Roques
Jérôme
J
Université Paris-Sud 11, Institut de Physique Nucléaire, IPNO bât 100, UMR 8608, F-91406 Orsay, France.
Veilly
Edouard
E
Université Paris-Sud 11, Institut de Physique Nucléaire, IPNO bât 100, UMR 8608, F-91406 Orsay, France.
Simoni
Eric
E
Université Paris-Sud 11, Institut de Physique Nucléaire, IPNO bât 100, UMR 8608, F-91406 Orsay, France.
D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D017974:Uranium Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D007477:Ions; D017974:Uranium Compounds; D014867:Water; C009495:titanium dioxide; D000536:Aluminum Hydroxide; D009532:Nickel; D014025:Titanium