Abstract
In light of the widespread Cs pollution that may follow nuclear disasters, the decontamination of post-accident soil has earned much attention due to the difficulty of Cs removal for its super-retention in micaceous minerals. Herein, we successfully used solvated Mg2+ to desorb Cs from Cs-saturated vermiculitized biotite (VB) to clarify the microscale mechanism underlying a Cs removal process, and we applied this new method to actual radioactive soil to validate the practical remediation effect. The results revealed that sorbed Cs was uniformly fixed in the collapsed interlayers of VB crystals and thus was poorly and slowly desorbed by ambient treatment with Mg2+ regardless of the treating concentration, duration time, and number of cycles. However, almost all Cs was effectively and efficiently removed by hydrothermal treatment at 250°C. Further characterizations of treated Cs-VB confirmed that Mg2+ indeed diffused into Cs collapsed interlayers from the edge-side to the interior central region with the increase of the treating temperature, and the substituted anhydrous Cs+ ensuing interlayer decollapsed. Similarly, a negligible amount of Cs was removed from the radioactive soil by treatment with Mg2+ at 60 °C, whereas nearly complete Cs removal was achieved at 250 °C, which clearly validated the desorption process as achieved for Cs-VB and definitely reinforced the applicability of the current reported pathway for practical Cs decontamination with soil remediation.
| Original language | English |
|---|---|
| Pages (from-to) | 392-401 |
| Number of pages | 10 |
| Journal | Chemical Engineering Journal |
| Volume | 333 |
| DOIs | |
| Publication status | Published - Feb 1 2018 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering
Cite this
Effective and efficient desorption of Cs from hydrothermal-treated clay minerals for the decontamination of Fukushima radioactive soil. / Yin, Xiangbiao; Horiuchi, Nobutake; Utsunomiya, Satoshi; Ochiai, Asumi; Takahashi, Hideharu; Inaba, Yusuke; Wang, Xinpeng; Ohnuki, Toshihiko; Takeshita, Kenji.
In: Chemical Engineering Journal, Vol. 333, 01.02.2018, p. 392-401.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effective and efficient desorption of Cs from hydrothermal-treated clay minerals for the decontamination of Fukushima radioactive soil
AU - Yin, Xiangbiao
AU - Horiuchi, Nobutake
AU - Utsunomiya, Satoshi
AU - Ochiai, Asumi
AU - Takahashi, Hideharu
AU - Inaba, Yusuke
AU - Wang, Xinpeng
AU - Ohnuki, Toshihiko
AU - Takeshita, Kenji
PY - 2018/2/1
Y1 - 2018/2/1
N2 - In light of the widespread Cs pollution that may follow nuclear disasters, the decontamination of post-accident soil has earned much attention due to the difficulty of Cs removal for its super-retention in micaceous minerals. Herein, we successfully used solvated Mg2+ to desorb Cs from Cs-saturated vermiculitized biotite (VB) to clarify the microscale mechanism underlying a Cs removal process, and we applied this new method to actual radioactive soil to validate the practical remediation effect. The results revealed that sorbed Cs was uniformly fixed in the collapsed interlayers of VB crystals and thus was poorly and slowly desorbed by ambient treatment with Mg2+ regardless of the treating concentration, duration time, and number of cycles. However, almost all Cs was effectively and efficiently removed by hydrothermal treatment at 250°C. Further characterizations of treated Cs-VB confirmed that Mg2+ indeed diffused into Cs collapsed interlayers from the edge-side to the interior central region with the increase of the treating temperature, and the substituted anhydrous Cs+ ensuing interlayer decollapsed. Similarly, a negligible amount of Cs was removed from the radioactive soil by treatment with Mg2+ at 60 °C, whereas nearly complete Cs removal was achieved at 250 °C, which clearly validated the desorption process as achieved for Cs-VB and definitely reinforced the applicability of the current reported pathway for practical Cs decontamination with soil remediation.
AB - In light of the widespread Cs pollution that may follow nuclear disasters, the decontamination of post-accident soil has earned much attention due to the difficulty of Cs removal for its super-retention in micaceous minerals. Herein, we successfully used solvated Mg2+ to desorb Cs from Cs-saturated vermiculitized biotite (VB) to clarify the microscale mechanism underlying a Cs removal process, and we applied this new method to actual radioactive soil to validate the practical remediation effect. The results revealed that sorbed Cs was uniformly fixed in the collapsed interlayers of VB crystals and thus was poorly and slowly desorbed by ambient treatment with Mg2+ regardless of the treating concentration, duration time, and number of cycles. However, almost all Cs was effectively and efficiently removed by hydrothermal treatment at 250°C. Further characterizations of treated Cs-VB confirmed that Mg2+ indeed diffused into Cs collapsed interlayers from the edge-side to the interior central region with the increase of the treating temperature, and the substituted anhydrous Cs+ ensuing interlayer decollapsed. Similarly, a negligible amount of Cs was removed from the radioactive soil by treatment with Mg2+ at 60 °C, whereas nearly complete Cs removal was achieved at 250 °C, which clearly validated the desorption process as achieved for Cs-VB and definitely reinforced the applicability of the current reported pathway for practical Cs decontamination with soil remediation.
UR - http://www.scopus.com/inward/record.url?scp=85033569502&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85033569502&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2017.09.199
DO - 10.1016/j.cej.2017.09.199
M3 - Article
AN - SCOPUS:85033569502
VL - 333
SP - 392
EP - 401
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -