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- 저자 : Robson S. Oliboni (검색결과 1 건)
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Rafael F.N. Quadrado,Gustavo Gohlke,Robson S. Oliboni,Alessandra Smaniotto,André R. Fajardo 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Silver nanoparticles (AgNPs) were synthesized using an innovative strategy that makes use of tangerinepeels extract, which acts as a reducing and stabilizing agent. This eco-friendly synthetic route allowedobtaining spherical nanoparticles with narrow size distribution (19.2 6.7 nm) within a short reaction time(40 min). Later, the AgNPs suspension was entrapped in a poly(vinyl alcohol) (PVA) matrix forming a hybridhydrogel (PVA-gel/AgNPs), which was characterized by different techniques. Its catalytic activity wasexplored in the reduction of nitrobenzene to aniline in aqueous media. The reaction catalyzed by PVA-gel/AgNPs exhibited kinetics (kapp2.07 10 3 min 1) and energy of activation (Ea50.36 kJ mol 1)comparable to or lower than similar reactions catalyzed by other metals. Moreover, a better catalyticperformance was noticed to the hybrid hydrogel as compared to “free” AgNPs, highlighting theirentrapment within the hydrogel. The anchoring of the AgNPs in the hydrogel network, prevents theiraggregation and leaching. The hybrid hydrogel is recovered quickly from the reaction medium, and it can besuccessfully reused for six consecutive runs without significant loss of its activity. Overall, it is presentedhere a cheap, efficient, and eco-friendly methodology to synthesize AgNPs and newly hybrid hydrogels,which have the potential to catalyze the reduction of nitroaromatic compounds.
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