Study on the mechanisms of radiocesium sorption/desorption on soil containing waste: Effects of organic matter through experimental and MD approaches

2014 Fiscal Year Final Research Report

• Project/Area Number: 24561036
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Hokkaido University
• Principal Investigator: WATANABE Naoko 北海道大学, 工学(系)研究科(研究院), 准教授 (20624711)
• Co-Investigator(Kenkyū-buntansha): KOZAKI Tamotsu 北海道大学, 工学研究院, 教授 (60234746)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 放射性セシウム / 土壌 / 収脱着 / MD計算 / 有機物

Outline of Final Research Achievements

To gain understanding on the long-term stability of the soil waste containing radiocesium for interim storage and disposal, effects of organic matter on the interaction between clay mineral surfaces and Cs were studied. Different sorption sites on mineral surfaces, including planar and interlayer surfaces as well as edges, were assumed to model the sorption experiment results to obtain the results that each site is affected differently by the presence of organic matter in the solution phase: sorption capacity of the interlayer sites of montmorillonite decreased with the presence of humic acid, and the selectivity on the illite FES site increased with the presence of fulvic acid. In addition, molecular dynamics simulation revealed the structure of a very strong innersphere complex formed at K-mica edges.

Free Research Field

放射性廃棄物工学