Adsorption characteristics of Cs+ on biogenic birnessite

Keiko Sasaki, Qianqian Yu, Taichi Momoki, Takuya Kaseyama

研究成果: ジャーナルへの寄稿学術誌査読

12 被引用数 (Scopus)


Adsorption of Cs+ on biogenic birnessite was investigated and compared with (ad)sorption of other heavy metals and also with (ad)sorption on chemically synthesized birnessite. The adsorption density of Cs+ on biogenic birnessite was smaller than that on chemically synthesized birnessite; however, the (ad)sorption densities of Co2+ and Ni2+ on biogenic birnessite were larger than on chemically synthesized birnessite. These phenomena can be interpreted by considering the distinctive nano-structure of biogenic birnessite, which is not only poorly crystalline and includes organic matter but also according to EXAFS contains a greater proportion of vacant central metal sites than is found in synthetic birnessite. Adsorbed Cs+ ions on both birnessites were mainly in the form of outer sphere complexes, which cannot easily occupy vacant central metal sites in biogenic birnessite. Biogenic birnessite has a greater specific surface area and more fine pores than synthetic birnessite, but these factors do not necessarily lead to more adsorption sites for Cs+ ions.

ジャーナルApplied Clay Science
出版ステータス出版済み - 11月 1 2014

!!!All Science Journal Classification (ASJC) codes

  • 地質学
  • 地球化学および岩石学


「Adsorption characteristics of Cs+ on biogenic birnessite」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。