Synthesis and characterization of mesoporous silicas functionalized by thiol groups, and application as sorbents for mercury (II) - Université de Lorraine Access content directly
Book Section Year : 2005

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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Dates and versions

hal-01941975 , version 1 (02-12-2018)

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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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