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• W2661570478 abstract "In this study, we used Silica/polyvinyl imidazole core-shell nanoparticles impregnated with sodium dihydrogen phosphate (SiO2/PVI/H2PO4− NPs) for adsorption of samarium and dysprosium ions from aqueous solutions. The effects of the pH, adsorbent dose, contact time, and initial concentration of the adsorbate on the Core-shell nanoparticles adsorption capacity have been studied. The pH value for maximum removal of Sm (III) and Dy (III) on the core-shell nanoparticles surface were found to be 4. The saturated capacity of SiO2/PVI/H2PO4− NPs was up to 160 mg.g−1 and 150 mg.g−1at 25 °C for Sm (III) and Dy (III) ions respectively. The obtained uptake data were analyzed by the Langmuir and Freundlich equations using a linearized correlation coefficient at room temperature. The Freundlich isotherm was found to fit well with the equilibrium data. The adsorption kinetics could be modeled by a pseudo-second-order rate expression. Thermodynamic investigation revealed the adsorption process of the studied ions is entropy driven. Furthermore, the performance of regeneration and reutilization were studied. The adsorbed Sm (III) and Dy (III) can be desorbed by 0.5 mol/L HCl, with the desorption percentage of 90% for Sm (III) and Dy (III). After five adsorption–desorption cycles, the adsorption capacity shows a slight decrease (about 15%), implying that the SiO2/PVI/H2PO4− NPs can be used as an effective adsorbent for the removal and recovery of Sm(III) and Dy(III) from aqueous solution. The colloid stability of the SiO2/PVI/H2PO4− NPs was investigated by dynamic light scattering measurements. The SiO2/PVI/H2PO4− NPs are stable in adsorption media after five adsorption – desorption cycles. The high stability of SiO2/PVI/H2PO4− NPs can be attributed to steric stabilization by polyvinyl imidazole adsorbed on SiO2 nanoparticle surfaces." @default.
• W2661570478 created "2017-06-30" @default.
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• W2661570478 date "2017-11-01" @default.
• W2661570478 modified "2023-10-02" @default.
• W2661570478 title "Synthesis and characterization of Silica/polyvinyl imidazole/H2PO4-core-shell nanoparticles as recyclable adsorbent for efficient scavenging of Sm(III) and Dy(III) from water" @default.
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• W2661570478 doi "https://doi.org/10.1016/j.jcis.2017.06.059" @default.
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