Efficient immobilization of ionic corrosion products by a silica-hydroxyapatite composite via a cold sintering route

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We have successfully demonstrated a new method of radioactive waste immobilization by hosting a waste-bearing form in another waste matrix. A cold sintering route was used to consolidate a silica-incorporated hydroxyapatite (Si-HAp) composite at 200 degrees C by applying a uniaxial pressure of 500 MPa for a short holding time of 10 min. The higher relative sintered density of up to 98.0 +/- 1.3% was achieved by 25 wt% Si loaded HAp. Results from high resolution X-ray diffraction, micro-hardness, and high resolution scanning electron microscopy confirmed the densification with good mechanical strength (micro-hardness = 2.9 +/- 0.3 GPa). For practical applications, two kinds of wastes (25 wt% ionic corrosion product-sorbed EDTA functionalized mesoporous silica and 75 wt% ionic corrosion product-sorbed HAp) were mixed, consolidated and tested. The chemical stability of the solidified composite matrix was positively assessed for low leaching rates of 5.9 x 10(-9) to 1.2 x 10(-5) g per m(2) per day using a standard product consistency test. The consolidated composite can bear compressive stress up to 358 MPa, which is orders of magnitude higher than the waste acceptance criteria of 3.5 MPa. The low process temperature can make this sintering process very powerful for the immobilization of radionuclides with volatility and low boiling point. Such a low temperature solidified matrix hosting various wastes may be a promising path for waste management because of its simplicity, reliability, scalability, cost effectiveness and environmental friendliness.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2019-10
Language
English
Article Type
Article
Citation

RSC ADVANCES, v.9, no.60, pp.34872 - 34879

ISSN
2046-2069
DOI
10.1039/c9ra04280f
URI
http://hdl.handle.net/10203/269047
Appears in Collection
NE-Journal Papers(저널논문)
Files in This Item
RSC Advances, 2019, 9, 34872 - 34879.pdf(1.17 MB)Download
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