Radionuclide interaction with clays in dilute and heavily compacted systems: A critical review

Andrew W. Miller, Yifeng Wang

Research output: Contribution to journalReview article

38 Scopus citations

Abstract

Given the unique properties of clays (i.e., low permeability and high ion sorption/exchange capacity), clays or clay formations have been proposed either as an engineered material or as a geologic medium for nuclear waste isolation and disposal. A credible evaluation of such disposal systems relies on the ability to predict the behavior of these materials under a wide range of thermal-hydrological-mechanical-chemical (THMc) conditions. Current model couplings between THM and chemical processes are simplistic and limited in scope. This review focuses on the uptake of radionuclides onto clay materials as controlled by mineral composition, structure, and texture (e.g., pore size distribution), and emphasizes the connections between sorption chemistry and mechanical compaction. Variable uptake behavior of an array of elements has been observed on various clays as a function of increasing compaction due to changes in pore size and structure, hydration energy, and overlapping electric double layers. The causes for this variability are divided between "internal" (based on the fundamental structure and composition of the clay minerals) and "external" (caused by a force external to the clay). New techniques need to be developed to exploit known variations in clay mineralogy to separate internal from external effects.

Original languageEnglish (US)
Pages (from-to)1981-1984
Number of pages4
JournalEnvironmental Science and Technology
Volume46
Issue number4
DOIs
Publication statusPublished - Feb 21 2012

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ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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