Trace-level plutonium(IV) polymer stability and its transport in coarse-grained granites

Xie, Jingyi; Wang, Yu; Lin, Jianfeng; Li, Mei; Zhang, Jihong; Zhou, Xiaohua; He, Yifeng

doi:10.1016/j.chemgeo.2015.01.015

Chemical Geology

2015

DOI: 10.1016/j.chemgeo.2015.01.015

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Trace-level plutonium(IV) polymer stability and its transport in coarse-grained granites

Jingyi Xie

Yu Wang

Jianfeng Lin

et al.

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Cited by 8 publications

(1 citation statement)

References 49 publications

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“…Significance for NPThe importance of size exclusion was elucidated in considering the reasons for unexpected large migration distances of solute contaminants, such as radionuclides, in the subsurface because of their association with groundwater colloids,[59,61,[274][275][276][277][278][279][280][281]. Size exclusion, also known in a more general concept as hydrodynamic chromatography, has been recognized as an underlying phenomenon for faster migration of particles compared to non-reactive solute in porous or fractured media[58-61, 100, 108, 117, 142, 151, 153, 280, 282-285].…”

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confidence: 99%

Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review

Babakhani¹,

Bridge

Doong³

et al. 2017

Advances in Colloid and Interface Science

136

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Environmental applications of nanoparticles (NP) increasingly result in widespread NP distribution within porous media where they are subject to various concurrent transport mechanisms including irreversible deposition, attachment/detachment (equilibrium or kinetic), agglomeration, physical straining, site-blocking, ripening, and size exclusion. Fundamental research in NP transport is typically conducted at small scale, and theoretical mechanistic modeling of particle transport in porous media faces challenges when considering the simultaneous effects of transport mechanisms. Continuum modeling approaches, in contrast, are scalable across various scales ranging from column experiments to aquifer. They have also been able to successfully describe the simultaneous occurrence of various transport mechanisms of NP in porous media such as blocking/straining or agglomeration/deposition/detachment. However, the diversity of model equations developed by different authors and the lack of effective approaches for their validation present obstacles to the successful robust application of these models for describing or predicting NP transport phenomena. This review aims to describe consistently all the important NP transport mechanisms along with their representative mathematical continuum models as found in the current scientific literature. Detailed characterizations of each transport phenomenon in regards to their manifestation in the column experiment outcomes, i.e., breakthrough curve (BTC) and residual concentration profile (RCP), are presented to facilitate future interpretations of BTCs and RCPs. The review highlights two NP transport mechanisms, agglomeration and size exclusion, which are potentially of great importance in controlling the fate and transport of NP in the subsurface media yet have been widely neglected in many existing modeling studies. A critical limitation of the continuum modeling approach is the number of parameters used upon application to larger scales and when a series of transport mechanisms are involved. We investigate the use of simplifying assumptions, such as the equilibrium assumption, in modeling the attachment/detachment mechanisms within a continuum modelling framework. While acknowledging criticisms about the use of this assumption for NP deposition on a mechanistic (process) basis, we found that its use as a description of dynamic deposition behavior in a continuum model yields broadly similar results to those arising from a kinetic model. Furthermore, we show that in two dimensional (2-D) continuum models the modeling efficiency based on the Akaike information criterion (AIC) is enhanced for equilibrium vs kinetic with no significant reduction in model performance. This is because fewer parameters are needed for the equilibrium model compared to the kinetic model. Two major transport regimes are identified in the transport of NP within porous media. The first regime is characterized by higher particle-surface attachment affinity than particle-particle attachment affinity, and operat...

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mentioning

confidence: 99%

Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review

Babakhani¹,

Bridge

Doong³

et al. 2017

Advances in Colloid and Interface Science

136

View full text Add to dashboard Cite

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An analysis of the hydrolytic polymerization of Pu(IV) and its reaction paths in nitric acid solution

Zhang

Chen

Ning

et al. 2020

J Radioanal Nucl Chem

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Aggregated germanium saponite: Removal and retention of polymeric thorium and uranium complexes

Zhai

Zhu

Tian

et al. 2022

Applied Clay Science

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Trace-level plutonium(IV) polymer stability and its transport in coarse-grained granites

Cited by 8 publications

References 49 publications

Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review

Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review

An analysis of the hydrolytic polymerization of Pu(IV) and its reaction paths in nitric acid solution

Aggregated germanium saponite: Removal and retention of polymeric thorium and uranium complexes

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