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Title: Structural analyses of amorphous calcium carbonate before and after removing strontium ions from an aqueous solution

Journal Article · · Journal of the Ceramic Society of Japan
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [5];  [5];  [5];  [6]
  1. Tokyo Univ. of Science, Chiba (Japan)
  2. National Inst. for Materials Science (NIMS), Ibaraki (Japan)
  3. Japan Synchrotron Radiation Research Inst. (JASRI), Hyogo (Japan)
  4. Chiba Univ. (Japan)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Tokyo Univ. of Science, Chiba (Japan); Tokyo Univ. of Science, Hokkaido (Japan)
+ Show Author Affiliations

Amorphous calcium carbonate (ACC) is a precursor of crystalline calcium carbonate; hence, its structural information at the atomic level is very important for controlling the morphology of crystalline calcium carbonate. In this study, we attempted to elucidate the process of Sr extraction from aqueous solution by using ACC for the purpose of removal of radioactive Sr from the contaminated water leaked after the Fukushima Daiichi nuclear accident. Here, the pair distribution functions, g(r) obtained by X-ray and neutron diffraction (ND) measurements show that ACC has a structure partially similar to that of monohydrocalcite, suggesting that ACC is transferred to the crystalline calcium carbonate starting from its crystal nucleus. Rietveld analysis of the ND data showed that the ACC that removed Sr was crystallized to calcite. However, the Sr–O coordination analyzed using extended X-ray absorption fine structure (EXAFS) implies that the local environment of O around Sr is similar to that in crystalline calcium carbonate aragonite.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1845760
Journal Information:
Journal of the Ceramic Society of Japan, Journal Name: Journal of the Ceramic Society of Japan Journal Issue: 2 Vol. 130; ISSN 1882-0743
Publisher:
The Ceramic Society of JapanCopyright Statement
Country of Publication:
United States
Language:
English

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