Abstract
Monolithic cesium ion (Cs+) adsorbents were synthesized via the directional freezing of a silica hydrogel containing ammonium molybdophosphate (AMP) particles, followed by freeze-drying. The adsorbents have a honeycomb-like structure with nearly straight microchannels (approximately 21 µm in diameter) running through them and with AMP particles partially embedded intact within the channel walls. Because of its honeycomb-like structure, the adsorbent, denoted as AMP silica microhoneycomb (AMP-SMH), achieves a significantly lower pressure drop than a typical column packed with spherical particles with similar diffusion path lengths for Cs+ when water was passed through it (about 35-times lower). Comparison of breakthrough curves between the AMP-SMH and columns packed with particles by numerical simulation also indicates that AMP-SMH shows shorter length of unused bed values. These results demonstrate that the AMP-SMH shows a high performance in the continuous separation of Cs+ due to their unique microhoneycomb structure.
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This work was supported by the Japan Society for the promotion of Science (JSPS) Grant-in-Aid for Scientific Research (B) 24360324.
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Yoshida, S., Iwamura, S., Ogino, I. et al. Continuous-flow separation of cesium ion by ammonium molybdophosphate immobilized in a silica microhoneycomb (AMP-SMH). Adsorption 25, 1089–1098 (2019). https://doi.org/10.1007/s10450-019-00060-2
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DOI: https://doi.org/10.1007/s10450-019-00060-2