Kim, YK, Kim, T, Kim, Y et al. (2 more authors) (2017) Highly effective Cs+ removal by turbidity-free potassium copper hexacyanoferrate-immobilized magnetic hydrogels. Journal of Hazardous Materials, 340. pp. 130-139. ISSN 0304-3894
Abstract
Potassium copper hexacyanoferrate-immobilized magnetic hydrogel (MHPVA) has been synthesized via a facile freeze/thaw crosslinking method. The citric acid coated Fe₃O₄ is embedded into the hydrogel matrix to facilitate the dispersion of nano-sized KCuHCF particles for Cs+ removal, followed by the rapid recovery of the composite in a magnetic field. The Cs+ adsorption behavior of the MHPVA is fitted well with the Langmuir isotherm and the pseudo-second-order kinetic model. The MHPVA exhibits both high Cs+ adsorption capacity (82.8 mg/g) and distribution coefficient (Kd) of 1.18 × 10⁶ mL/g (8.3 ppm Cs+, V/m = 1000 mL/g). Sorption of above 90% Cs+ to the MHPVA is achieved in less than 3 h of contact time. Moreover, the MHPVA reveals stable and high Cs+ removal efficiency across a wide pH range from 4 to 10. In terms of Cs+ selectivity, the MHPVA shows above 96% removal efficiency in the presence of 0.01 M competing cations such as Mg²+, Ca²+, Na+, and K+ with 1 ppm of Cs+. From a practical perspective, the MHPVA still exhibits stable and promising selective properties even in groundwater and seawater conditions and after 5 days of contact time the used adsorbent is rapidly recovered leaving a turbidity-free aqueous environment.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2017, Elsevier B.V. All rights reserved. This is an author produced version of a paper published in the Journal of Hazardous Materials. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Cesium removal; Fukushima; Potassium copper hexacyanoferrate; Iron oxide nanoparticle; Magnetic hydrogel |
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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Jul 2017 15:52 |
Last Modified: | 28 Jun 2018 00:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jhazmat.2017.06.066 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:118644 |