Functionalized SBA-15 mesoporous silica in ion chromatography of alkali,alkaline earths,ammonium and transition metal ions |
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Authors: | Maria Concetta Bruzzoniti Rosa Maria De Carlo Sonia Fiorilli Barbara Onida Corrado Sarzanini |
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Institution: | 1. Dipartimento di Chimica Analitica, Università degli Studi di Torino, Via P. Giuria 5, 10125 Torino, Italy;2. Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;3. CR-INSTM for Materials with Controlled Porosity, Italy |
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Abstract: | The retention properties of a SBA-15 mesoporous silica functionalized with –(CH2)3COOH groups, synthesized by a co-condensation route, were investigated for the ion chromatography of different cationic species. A systematic study on the effect of different eluent compositions containing non-complexing (methanesulfonic acid) or complexing (oxalic or pyridine-2,6-dicarboxylic acids) eluents, in the presence of organic modifiers (CH3CN, CH3OH, CH3NH2) on the retention of cations (Li+, Na+, K+, Ca2+, Mg2+, Sr2+, Ba2+, NH4+, Cu2+, Ni2+, Zn2+, Cd2+, Co2+, Pb2+, Fe3+) chosen as model analytes and for their environmental importance, allowed us to elucidate the mechanisms (cation-exchange or complexation) involved in the retention on the SBA-15 phase. For the first time separations of cations on SBA-15 based stationary phases are investigated, providing the basis for further development of mesoporous silica chemistry for in-flow ion-exchange applications. |
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Keywords: | Mesoporous silica Chromatography Stationary phase Cation-exchange Alkali and alkaline earths Transition metals |
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