Synthesis and characterization of mesoporous silicas functionalized by thiol groups, and application as sorbents for mercury (II)

Abstract : Heavy metal ion (HgII) adsorbents with uniform mesopore channels were prepared by functionalizing SBA-15 and SBA-16 type ordered mesoporous silica samples with mercaptopropyl groups according to two routes: post synthesis grafting of pure mesoporous silica and direct functionalization by a co-condensation procedure. XRD, N2 adsorption-desorption measurements and 29Si solid state NMR spectroscopy were used to characterize the physico-chemical properties of the organic-inorganic hybrid materials and to investigate the different functionalization processes on the two types of ordered mesoporous silica SBA-15 and SBA-16 materials. Higher contents in organo-functional groups were achieved when following the one-step co-condensation route in comparison with the post-synthesis grafting. However, the evaluation of the diffusion rates of HgII species in the mesoporous solids by means of an electrochemical method showed faster binding rates for the post-synthesis grafted samples.
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https://hal.univ-lorraine.fr/hal-01941975
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Submitted on : Sunday, December 2, 2018 - 7:55:45 PM
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C. Lesaint, F. Frébault, C. Delacote, B. Lebeau, C. Marichal, et al.. Synthesis and characterization of mesoporous silicas functionalized by thiol groups, and application as sorbents for mercury (II). Nanoporous Materials IV Proceedings of the 4th International Symposium on Nanoporous Materials 7-10 July 2005 • Niagara Falls, Ontario, Canada, 156, pp.925-932, 2005, ⟨10.1016/S0167-2991(05)80305-2⟩. ⟨hal-01941975⟩

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