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Journal Articles

Subangstrom tuning of pore size for selective separation of radioactive strontium over environmental calcium by lanthanide-oxalate frameworks

Nankawa, Takuya; Sekine, Yurina; Yamada, Teppei*

Nihon Genshiryoku Gakkai Wabun Rombunshi (Internet), 23(2), p.50 - 63, 2024/06

https://doi.org/10.3327/taesj.J23.007

Selective separation of radioactive ions is essential for reducing or cleaning radioactive wastes. Among the radioisotopes to be removed, $$^{90}$$Sr poses a major threat to human health and the environment. However, removal of $$^{90}$$Sr from environmental wastewater is still challenging due to the difficulty of separating $$^{90}$$Sr$$^{2+}$$ from Ca$$^{2+}$$. Here, we developed a series of isostructural lanthanide oxalate frameworks (LOFs) comprising oxalate and eight kinds of lanthanide (Ln) ions, i.e., from Samarium (Sm) to Thulium (Tm) for application to selective removal of $$^{90}$$Sr from wastewater using its tuned porous structure. The LOFs had ion exchangeable anionic pores, in which the size of the pores changed in a stepwise manner depending on the host Ln species. When Tb was the host Ln of the LOF, the LOF showed extremely high Sr$$^{2+}$$ selectivity and was able to distinguish the subtle difference in ionic radius (0.2 ${AA}$) between Sr$$^{2+}$$ and Ca$$^{2+}$$. The Sr$$^{2+}$$ selectivity was higher than that of conventional adsorbents. The pore size tuning of the LOFs by selecting the constituent Ln species yielded a highly ion-selective adsorbent material. This novel strategy will be useful in developing custom porous materials that are easy to prepare and applicable across various fields.

JAEA Reports

None

Wada, Yukio; ; ;

PNC TY8607 97-002, 158 Pages, 1997/05

PNC-TY8607-97-002.pdf:3.2MB

no abstracts in English

JAEA Reports

None

PNC TJ6614 93-001, 32 Pages, 1993/03

PNC-TJ6614-93-001.pdf:0.61MB

None

Oral presentation

Selective separation and recovery of Sr from environmental ions by lanthanide oxalate frameworks

Nankawa, Takuya; Sekine, Yurina; Yamada, Teppei*

no journal, , 

Among the radioisotopes to be removed, $$^{90}$$Sr, which has a radioactive half-life of 28.8 years, poses a major threat to human health and the environment because of its uptake and retention in biological systems. However, removal of $$^{90}$$Sr from wastewater is still challenging due to the difficulty of separating Sr$$^{2+}$$ from Ca$$^{2+}$$. Ca$$^{2+}$$ has a similar properties and ionic radius to $$^{90}$$Sr$$^{2+}$$. Indeed, the difference in their ionic radii is only 0.2 ${AA}$. Furthermore, the concentration of Ca$$^{2+}$$ in actual nuclear wastewater is usually much higher than that of $$^{90}$$Sr, which limits the efficient removal of $$^{90}$$Sr. Here, we developed a series of isostructural lanthanide oxalate frameworks (LOFs) comprising oxalate and eight kinds of lanthanide (Ln) ions, i.e., from Sm to Tm, for application to selective removal of $$^{90}$$Sr from wastewater using its tuned porous structure. When Tb was the host Ln of the LOF, the LOF showed extremely high Sr$$^{2+}$$ selectivity and was able to distinguish the subtle difference in ionic radius between Sr$$^{2+}$$ and Ca$$^{2+}$$. This novel pore size tuning strategy will be useful in developing custom porous materials that are easy to prepare and applicable across various fields.

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