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Start Over Author "Silvestri, Brigida" Journal microporous and mesoporous materials
4 results on '"Silvestri, Brigida"'

4. Hierarchical micro-to-macroporous silica nanoparticles obtained by their grafting with hyper-crosslinked resin

Author

Marco Guerritore, Federico Olivieri, Roberto Avolio, Rachele Castaldo, Mariacristina Cocca, Maria Emanuela Errico, Marino Lavorgna, Brigida Silvestri, Veronica Ambrogi, Gennaro Gentile, Guerritore, Marco, Olivieri, Federico, Avolio, Roberto, Castaldo, Rachele, Cocca, Mariacristina, Emanuela Errico, Maria, Lavorgna, Marino, Silvestri, Brigida, Ambrogi, Veronica, and Gentile, Gennaro

Subjects
Hierarchical porosity, Dye adsorption, Mechanics of Materials, Mesoporous silica nanoparticles, Microporosity, Hyper-crosslinked resin, General Materials Science, General Chemistry, Condensed Matter Physics
Abstract

In this work, mesoporous silica nanoparticles (MSN) hybridized with an organosilane are grafted with hyper-crosslinked poly(vinylbenzyl chloride) (PVBC), which is anchored into the mesopores and onto the external surface of MSN. The obtained nanoparticles are characterized by a MSN-templated hierarchical porosity composed of micropores, mesopores and macropores originated from the hyper-crosslinking of the PVBC phase, with a microporous fraction reaching up to 28% of the total pore volume. Tested for the adsorption of a model dye (Rhodamine 6G, Rh6G), these nanoparticles result much more efficient in Rh6G adsorption with respect to plain MSN, showing a Rh6G uptake of about 125 mg/g in highly concentrated solutions (1000 mg/L) and quite complete removal (about 98%) of the dye in more diluted conditions (30 mg/L) with comparable efficiency in repeated adsorption cycles. Overall results demonstrate the key role of the hierarchical porosity of the hyper-crosslinked PVBC-grafted MSN to tailor their adsorption properties.

Published
2022

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