New silica gels functionalized with 2-hydroxy-3-methacryloyloxypropyl-beta-cyclodextrin using coating or grafting methods

The synthesis of a large range of supports based on silica functionalized b y a new derivative of beta-cyclodextrin, 2-hydroxy-3-methacryloyloxypropyl- beta-cyclodextrin (beta CDMAHP monomer), is described. Two methods of react ion were chosen: (1) coating via a radical polymerization of the beta CDMAH P monomer (E1 series) and (2) radical grafting after silanization of silica using gamma-methacryloyltrimethoxysilane (G1 series). As a preliminary ste p, a detailed spectroscopic characterization of the beta CDMAHP was underta ken. Subsequently, within the two approaches, the experimental conditions w ere varied in order to investigate the effect on the beta CD content in the functionalized supports. The changes in the porosity of the silica were al so analysed. Finally, a comparison of the two methods is discussed, bearing in mind that these sorbents are to be used for water decontamination appli cations.