Silica Nanospheres Coated by Ultrasmall Ag0 Nanoparticles for Oxidative Catalytic Application

• Published in: Colloid and interface science communications 2017-11, Vol.21, p.1-5
• Main Authors: Fedorenko, Svetlana V., Jilkin, Michail E., Gryaznova, Tatyana V., Iurko, Elizaveta O., Bochkova, Olga D., Mukhametshina, Alsu R., Nizameev, Irek R., Kholin, Kirill V., Mazzaro, Raffaello, Morandi, Vittorio, Vomiero, Alberto, Mustafina, Asiya R., Budnikova, Yulia H.
• Format: Article
• Language: English
• Subjects: C-H phosphonation; Catalytic activity; Immobilization; Metallic silver; Silica nanoparticles
• ISSN: 2215-0382; 2215-0382
• DOI: 10.1016/j.colcom.2017.10.001

The present work introduces optimal modifiсation of core-shell composite nanomaterial, where small (2–8nm) Ag0 nanoparticles are deposited onto large (about 140nm) silica spheres for application in oxidative catalysis. The size of Ag0 and density of its deposition onto silica spheres was modified by the post treatment of initially deposited Ag0 (about 30nm) by hydrogen peroxide in specific conditions. The comparison of catalytic effect of the post-treated and initial SN-Ag0 in electrochemical phosphonation of benzo(thia)oxazoles by diethyl phosphite in oxidative conditions revealed the difference between the composite nanoparticles. In particular, the post-treated SNs-Ag0 nanoparticles exhibit efficient catalytic effect in oxidative conditions resulting in facile and green method for synthesis of phosphonated benzooxa(thia)zoles, while no catalytic effect is observed under the use of larger Ag0 nanoparticles deposited onto silica spheres. The use of Ag0-based nanomaterial in oxidative catalysis had been never demonstrated before. [Display omitted] •First report on efficient use of Ag0-nanomaterial as source of Ag2+ in oxidative catalysis.•Silica spheres (140) nm decorated by 2–8nm-sized Ag0 as heterogeneous catalysts.•Two-step H2O2-facilitatated synthetic procedure for Ag0 size modification.