Abstract
Sorption study of Nb(V) and Pa(V) was carried out on silica in the pH range of 1–12. Presence of humic acids has positive effects on sorption in acidic pH and has negative effects in basic pH which is more severe. The sorption mechanism was evaluated using classical as well as spectroscopic techniques. Ionic strength study reveals outer sphere complexation in acidic region, whereas strong possibility of inner sphere surface complexation in neutral and basic regions. Thermodynamic data further reinforce the findings of salinity studies. Extended X-ray Absorption Fine Structure (EXAFS) analysis of Nb(V) sorbed silica at different pH clearly showed that in acidic medium, Nb is not coordinated with any Si atom, whole coordination number is satisfied by O atom and water molecules whereas in neutral and basic medium, Nb is coordinated with 1–2 Si atoms at 3.44 Å and 3.5 Å via O bridge. The spectroscopic analysis endorses the claim by salinity and thermodynamic data, and concludes the physisorption in acidic medium and chemisorption in neutral as well as basic region.
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Authors thank Dr. H Pal, Associate Director, Chemistry Group (A) and Head, Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India for his support. Authors also thank Dr. R. K. Singhal, Dr. Bhupesh B. Kalekar, of ACD, BARC and Dr. Rajini Antony P., Chemistry Division, BARC for their help during the work.
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Ghosh, M., Yadav, A.K., Devi, P.S.R. et al. Thermodynamic and spectroscopic investigation of Nb(V) and Pa(V) sorption on colloidal silica. Environ Earth Sci 79, 32 (2020). https://doi.org/10.1007/s12665-019-8781-3
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DOI: https://doi.org/10.1007/s12665-019-8781-3