Rapid Hydrolysis of Organophosphates Induced by U(IV) Nanoparticles: A Kinetic and Mechanistic Study using Spectroscopic Analysis
Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute, Daedeok-daero, Yuseong-gu, Daejeon 989-111, Korea
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Colloids Interfaces 2019, 3(4), 63; https://doi.org/10.3390/colloids3040063
Received: 8 September 2019
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Revised: 19 November 2019
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Accepted: 20 November 2019
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Published: 26 November 2019
The heterogeneous interactions of colloidal U particles with organophosphates, leading to the formation of U-phosphate minerals, can retard the migration of U in contaminated sites. Here, we studied the hydrolytic mechanism of p-nitrophenyl phosphate (NPP) on the surfaces of tetravalent uranium nanoparticles (U(IV)NPs), resulting in the formation of U-phosphate precipitates. Our study shows that the reaction rate of NPP hydrolysis is significantly enhanced by U(IV)NPs through a multi-step heterogeneous reaction on the particle surfaces. The end products of the reaction were identified as U(IV)NPs-aggregates with surface-bound phosphates. Colloidal properties, such as high positive values of the zeta-potential (>+30 mV) and large surface areas of U(IV)NPs due to their unique cluster structures consisting of relatively small primary UO2(cr)-particles, are correlated with their reactivity towards hydrolysis reaction. Reaction kinetic modeling studies using spectrophotometric data indicated the presence of two distinct reaction intermediates as the surface complexes of NPP on U(IV)NPs. We suggest the involvement of the NPP inner-sphere complexes in the rate-determining step based on the results obtained by analyzing the ATR-FTIR spectra and the surface-enhanced infrared absorption of NPP bound to substrate surfaces.
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Keywords:
tetravalent uranium nanoparticles (U(IV)NPs); organophosphates; p-nitrophenyl phosphate (NPP); hydrolysis; surface complexation; surface-enhanced infrared absorption; heterogeneous reaction mechanism
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MDPI and ACS Style
Cho, H.; Cha, W. Rapid Hydrolysis of Organophosphates Induced by U(IV) Nanoparticles: A Kinetic and Mechanistic Study using Spectroscopic Analysis. Colloids Interfaces 2019, 3, 63. https://doi.org/10.3390/colloids3040063
AMA Style
Cho H, Cha W. Rapid Hydrolysis of Organophosphates Induced by U(IV) Nanoparticles: A Kinetic and Mechanistic Study using Spectroscopic Analysis. Colloids and Interfaces. 2019; 3(4):63. https://doi.org/10.3390/colloids3040063
Chicago/Turabian StyleCho, Hyejin, and Wansik Cha. 2019. "Rapid Hydrolysis of Organophosphates Induced by U(IV) Nanoparticles: A Kinetic and Mechanistic Study using Spectroscopic Analysis" Colloids and Interfaces 3, no. 4: 63. https://doi.org/10.3390/colloids3040063
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