Zusammenfassung
Chemically stable phosphonate functionalized mesoporous silica material SGMP6 has been obtained by means of conventional sot-gel methodology. This material demonstrated a high lead uptake efficiency from aqueous solutions according to the complete participation of the phosphonate moieties in the interaction. This uptake efficiency is related to 0.2 g of lead per gram of adsorbent. The morphology ...
Zusammenfassung
Chemically stable phosphonate functionalized mesoporous silica material SGMP6 has been obtained by means of conventional sot-gel methodology. This material demonstrated a high lead uptake efficiency from aqueous solutions according to the complete participation of the phosphonate moieties in the interaction. This uptake efficiency is related to 0.2 g of lead per gram of adsorbent. The morphology of the material, the mechanism of the lead uptake and its efficiency of P/Pb ratio of 2:1 have been characterized at the atomic level by SEM-EDX and ssNMR of C-13, Si-29 and P-31. XPS measurements of the materials before and after lead uptake also confirmed the ions exchange in the phosphonate moieties. It has been shown that all phosphonate groups are accessible to lead ions and that their interactions can be evaluated by conventional P-31 NMR methods.
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