Kim, H, Eom, HH, Kim, Y et al. (2 more authors) (2022) Reversible electro-mediated cesium ion removal using a zeolitic imidazolate framework derived zinc hexacyanoferrate composite. Chemical Engineering Journal, 450 (Part 2). 138029. ISSN 1385-8947
Abstract
Cesium (137Cs) is one of the representative radionuclides which must be eliminated from nuclear waste. Here, we designed a zinc hexacyanoferrate (ZnHCF) composite using ZIF-8 derived carbon (ZDC) and utilized it as an electrode to selectively remove cesium ions. Specifically, we focused on how the ZIF-8 pyrolysis temperature affected the composite formation and non-radioactive cesium removal performance. With an optimized temperature of 700 °C, a highly conductive and uniform composite with well-distributed ZnHCF was produced, and it exhibited a large cesium uptake capacity (204.9 mg g−1). The composite electrode also retained high selectivity in Na-rich environments (molar Na/Cs = 1330, Kd (mL g−1) = 1.04 x 10⁵), K-rich environments (molar K/Cs = 133, Kd (mL g−1) = 7.20 x 10⁴), and groundwater conditions (95 % removal, C0 = 0.007 mM Cs+). Moreover, the reversible uptake and release of cesium over 5 cycles were feasible in our system without any chemical additives, which can be reached 100 % regeneration at the fourth cycle. Using in-depth characterizations including XRD and XPS, we investigated the faradaic behavior, phase transition, and structural stability of the ZnHCF-ZDC composite over 5 cycles. This study formed a composite electrosorbent with a ZIF-derived carbon support and applied it to cesium removal for the first time. This electro-mediated cesium removal process is expected to serve as a green technology for the future nuclear industry and environmental remediation.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | Cesium ion; ZIF-8; Pyrolysis; Electrosorption; Redox reaction |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/S032797/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 May 2023 13:07 |
Last Modified: | 09 Aug 2023 14:08 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.cej.2022.138029 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:199571 |