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      저자 : Laudemir C. Varanda (검색결과 1 건)
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        Catalytic hydrogenation of organic dyes by Ag nanoparticles on reduced graphene oxide

        Bruno C. Mascarenhas,Laudemir C. Varanda 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

        Stable, efficient, and reusable catalysts for wastewater treatment, promoting the catalytic elimination ofenvironmental pollutants remains a current challenge. This work shows a one-pot synthesize Agnanoparticles (AgNPs) supported on reduced graphene oxide (rGO/Ag) as a nanocatalyst. Morphological control of AgNPs was achieved by adding NH4OH during the nucleation and growth processesleading to the spherical nanoparticles with average size of 9 ± 3 nm). Temperature increase promotesdecrease of the oxygenated functional groups on rGO sheets, with an ID/IG = 0.57 at 300 C. Catalyticactivity of rGO/Ag was investigated through the catalytic hydrogenation of methylene blue (MB) and rhodamineB (RhB) in the presence of NaBH4 as a reducing agent. The proposed mechanism is based on thetransfer of 2e and 1H+ between the nanocatalyst and the dye molecules. Dyes adsorption on the catalystis a rate-determining step and was accelerated by the rGO support. X-ray photoelectron spectroscopyanalysis before and after successive catalytic cycles indicated that the catalyst integrity was maintained,with a slight decrease in the silver amount from 4.53 to 3.78 at%. The decolorization reaction followed thepseudo-first-order kinetics model for both dyes, and our results showed an efficiency of around 30%higher than similar methods.

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