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Perrhenate (ReO$$_{4}$$$$^{-}$$) removal from aqueous solutions by mono-, bi-, and tri-metallic iron nanoparticles; A Comparative study

Maamoun, I.; 徳永 紘平; Falyouna, O.*; Eljamal, O.*; 田中 万也

no journal, , 

Recently, the rapid development of nuclear power technologies and the continuous energy demand around the world exhibited massive amounts of contaminated water with radionuclides. The exposure to TcVII-contaminated water can be harmful to human health, causing toxic effects and organs damage when ingested. Therefore, TcO $$_{4}$$$$^{-}$$ removal from aqueous solutions can be challenging, in terms of fast and efficient immobilization. Correspondingly, perrhenate (ReO$$_{4}$$$$^{-}$$) was considered as perrhenate (TcO$$_{4}$$$$^{-}$$) surrogate to ease the radioactivity-related complications, owing to the physiochemical similarities between Tc and rhenium (Re). In this study, nickel (Ni) andzirconium (Zr) were considered in the preparation of bi- and tri-metallic Fe0 nanoparticles, as they both showed the highest ReO $$_{4}$$$$^{-}$$ removal performance comparing with other metals. The effect of reaction conditions on ReO $$_{4}$$$$^{-}$$ removal was investigated, including mass ratio of iron to the doped metal, material dosage, and initial pH. Results showed enhanced ReO $$_{4}$$$$^{-}$$ removal rate when using bi-metallic Ni-Fe0 (mass ratio 2.5) and Zr/Fe0 (mass ratio 20) comparing with Fe0. The difference in ReO$$_{4}$$$$^{-}$$ removal using mono-, bi-, and tri-metallic was not clear at high material dosage, such as 2.0 and 1.0 g/L. Nevertheless, comparing lower dosage (0.5 g/L)of bi- and tri-metallic to 1.0 g/L mono-metallic Fe0 dosage exhibited a clear superiority of tri-metallic Zr-Ni/Fe0 to other materials; where 0.5 g/L of the material could efficiently achieve around 98% ReO$$_{4}$$$$^{-}$$ removal within just 10 min reaction time (1.8 times higher than 1.0 g/L Fe0). The significant enhancement in ReO$$_{4}$$$$^{-}$$ removal rate by tri-metallic Fe0 nanoparticles can be attributed to the induced rate of electron transfer from iron core through the mixed Zr-Nideposits on Fe0 surface.

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