Highly effective Cs+ removal by turbidity-free potassium copper hexacyanoferrate-immobilized magnetic hydrogels

JOURNAL OF HAZARDOUS MATERIALS

卷:340

Article

Kim, Yun Kon¹  Kim, Taegeon¹  Kim, Yonghwan¹  Harbottle, David²  Lee, Jae W.¹ 

[1] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Daejeon 305701, South Korea

[2] Univ Leeds, Sch Chem & Proc Engn, Leeds LS2 9JT, W Yorkshire, England

关键词: Cesium removal;    Fukushima;    Potassium copper hexacyanoferrate;    Iron oxide nanoparticle;    Magnetic hydrogel;   

DOI  :  10.1016/j.jhazmat.2017.06.066

来源: Elsevier

【 摘 要 】

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 (K-d) of 1.18 x 10(6) mL/g (8.3 ppm Cs+, vim = 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 I 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. (C) 2017 Elsevier B.V. All rights reserved.

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