Ligand-modified mesoporous silica SBA-15/silver hybrids for the catalyzed reduction of methylene blue. Issue 62 (15th June 2016)

• Record Type: Journal Article
• Authors: Saad, Ali; Snoussi, Youssef; Abderrabba, Manef; Chehimi, Mohamed M.
• Is Part Of: RSC advances. Volume 6:Issue 62(2016)
• Page Start: 57672
• Page End: 57682
• Publication Date: 2016-06-15
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra12061j
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Mesoporous silica SBA-15 was prepared and functionalized by (3-glycidyloxypropyl)trimethoxysilane in order to bind 2-aminothiazole and aminopropyl-triazole ligands. Abstract : Mesoporous silica SBA-15 was prepared and functionalized by (3-glycidyloxypropyl)trimethoxysilane in order to bind 2-aminothiazole and aminopropyl-triazole ligands. These groups were immobilized through two distinct chemistry routes: reaction of epoxy with amine resulting in AMT-SBA-15 for the former, and epoxy ring opening followed by 1, 3-dipolar cycloaddition click reaction providing Tr-SBA-15, for the latter. These ligand-functionalized SBA-15 materials served as reactive platforms for the in situ deposition of silver nanoparticles from the reduction of silver nitrate. The silver-decorated hybrid Ag/AMT-SBA-15 and Ag/Tr-SBA-15 samples, as well as their precursors, were characterized by X-ray diffraction (XRD), N2 adsorption–desorption isotherms, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The silver-decorated hybrid materials were evaluated as catalysts for the reduction of methylene blue; the results showed excellent catalytic efficiencies with reduction rate constants of 14.3 × 10 −3 and 9.4 × 10 −3 s −1 for Ag/Tr-SBA-15 and Ag/AMT-SBA-15, respectively. These values are comparable or higher than those claimed in the literature for similar application.