SIMPLE THIOL-ENE CLICK CHEMISTRY MODIFICATION OF SBA-15 SILICA PORES WITH CARBOXYLIC ACIDS

BORDONI, ANDREA V.; LOMBARDO, MA VERÓNICA; REGAZZONI, ALBERTO E.; SOLER ILLIA, GALO J. A. A.; WOLOSIUK, ALEJANDRO

Sitges

Conferencia; Fourth International Conference on Multifunctional, Hybrid and Nanomaterials; 2015

Andrea V. Bordoni1, M. Verónica Lombardo1, Alberto E. Regazzoni1, Galo J. A. A. Soler-Illia1,2, Alejandro Wolosiuk1 1Gerencia Química - Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499 B1650KNA San Martín, Buenos Aires (Argentina), 2DQIAyQF, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, C1428EHA, Buenos Aires, Argentina Abstract: (Your abstract must use Normal style and must fit in this box. Your abstract should be no longer than 300 words. The box will ?expand? over 2 pages as you add text/diagrams into it.) We present a simple and straightforward approach for the tailored addition of carboxylic groups to mesoporous silica colloids. Thiol-ene click photochemical reactions between vinyl-silylated precursors and different thioacids yield carboxylic silane precursors. Through this approach mercaptoacetic, mercaptoundecanoic and mercaptopropionic acid functions were immobilized on the silica mesopore walls. Post grafting of these precursors on SBA-15 materials has been confirmed by infrared spectrometry (FTIR), energy dispersive X-ray spectroscopy (EDS), total chemical analysis and zeta potential measurements. Moreover, detailed field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD) and small angle X-Ray scattering (SAXS) data revealed parallel mesopores and ordered mesostructures, while FTIR showed that the immobilized COOH groups are chemically accessible and present different response for adsorbed water. On the other hand, co-condensation of these carboxylic derivatized silanes in the SBA reaction mixture yields materials with low or none mesostructure. The tailored easy chemical synthesis of carboxylic modified alkoxide precursors permits to create functional silica able to retain environmentally relevant ions such as Cu(II),. Hg(II) and Pb(II).