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• W2015365688 abstract "Silica gel was firstly functionalised with aminopropyltrimethoxysilane obtaining the aminopropylsilica gel (APSG). The APSG was reacted subsequently with morin yielding morin-bonded silica gel (morin-APSG). The structure was investigated and confirmed by elemental and thermogravimetric analyses, IR and 13C NMR spectral studies. Morin-APSG was found to be highly stable in common organic solvents, acidic medium (<2 mol L−1 HCl, HNO3) or alkaline medium up to pH 8. The separation and preconcentration of Ag(I), Au(III), Pd(II), Pt(II) and Rh(III) from aqueous medium using morin-APSG was studied. The optimum pH values for the separation of Ag(I), Au(III), Pd(II), Pt(II) and Rh(III) on the sorbent are 5.7, 2.2, 3.7, 3.7 and 6.8, giving rise to separation efficiencies of 43.9, 85.9, 97.7, 60.9 and 91.0%, respectively, where the activity was found to be >90% in the presence of acetate ion. The ion sorption capacity of morin-APSG towards Cu(II) at pH 5.5 was found to be 0.249 mmol g−1 where the sorption capacities of Ag(I) and Pd(II) were 0.087 and 0.121 mmol g−1 and 0.222 and 0.241 mmol g−1 at pH 2.2 and 5.7, respectively. This indicates a 1:1 and 1:2 morin/metal ratios at pH 2.2 and 5.7, respectively. Complete elution of the sorbed metal ions was carried out using 10 mL (0.5 mol L−1 HCl + 0.01 mol L−1 thiourea) in case of Au(III), Pd(II), Pt(II) and Rh(III) and 10 mL 0.5 mol L−1 HNO3 in case of Ag(I). Morin-APSG was successfully employed in the separation and preconcentration of the investigated precious metal ions from some spiking water samples yielding 100-folds concentration factor. The relative standard deviation (R.S.D.) and the T-test (|t|1) were calculated." @default.
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• W2015365688 date "2006-02-28" @default.
• W2015365688 modified "2023-09-26" @default.
• W2015365688 title "Synthesis and characterisation of morin-functionalised silica gel for the enrichment of some precious metal ions" @default.
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• W2015365688 doi "https://doi.org/10.1016/j.talanta.2005.08.016" @default.
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