Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 324, Issue -, Pages 348-356Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.10.068
Keywords
Sequential annealing mechanism; Ion exchanger; Cesium uptake; Breakthrough curves; Competitive reaction
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Funding
- Postgraduate Innovation Fund Project by Southwest University of Science and Technology, P.R. China [16ycx009]
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Long-lived Cs-137 (over 30 years), a byprOduct of the spent fuel fission processes, comprises the majority of high-level and prolific heat-generating waste in downstream processing. This study reports a novel sequential annealing mechanism with cross-linked network of polyvinyl alcohol, fabricating the composite of ammonium molybdophosphate loaded on silica matrix (SM-AMP20, 20 wt% AMP) as an excellent granular ion exchanger for removal Cs+. When the matrix is remarkably sequential annealed, well dispersed SM-AMP20 particles are formed by firmly anchoring themselves on controlling the porous characteristics and stable structure. The material crystallizes in the complex cubic space group Pn-3m with cell parameters of crystalline AMP formation. The breakthrough curve of Cs+ by SM-AMP20 follows the Thomas model with a high removal rate of 88.23% (similar to 10 mg/L of Cs+) and breakthrough time as high as 26 h (flow rate (Q approximate to 2.5 mL/min and bed height Z approximate to 11 cm) at neutral pH. We also report on sorbents that could efficiently remove Cs' ions from complex solutions containing different competitive cations (Na+, Al3+, Fe3+, and Ni2+, respectively) in large excess. Furthermore, this study shows that there is a probability for SM-AMP20 to recycle cesium using an eluent of 2-3 mol/L NH4NO3 solution. (C) 2016 Elsevier B.V. All rights reserved.
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