| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Univ Sao Paulo, Inst Quim Sao Carlos IQSC, Phys Chem Dept, Colloidal Mat Grp, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 1
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| Document type: | Journal article |
| Source: | JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY; v. 103, p. 124-135, NOV 25 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Stable, efficient, and reusable catalysts for wastewater treatment, promoting the catalytic elimination of environmental pollutants remains a current challenge. This work shows a one-pot synthesize Ag nanoparticles (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 processes leading to the spherical nanoparticles with average size of 9 +/- 3 nm). Temperature increase promotes decrease of the oxygenated functional groups on rGO sheets, with an I-D/I-G = 0.57 at 300 degrees C. Catalytic activity of rGO/Ag was investigated through the catalytic hydrogenation of methylene blue (MB) and rhodamine B (RhB) in the presence of NaBH4 as a reducing agent. The proposed mechanism is based on the transfer of 2e and 1H(+) between the nanocatalyst and the dye molecules. Dyes adsorption on the catalyst is a rate-determining step and was accelerated by the rGO support. X-ray photoelectron spectroscopy analysis 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 the pseudo-first-order kinetics model for both dyes, and our results showed an efficiency of around 30% higher than similar methods. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 13/01284-2 - Theranostic nanoparticles based in superparamagnetic iron oxide for skin cancer therapy by magnetic hyperthermia |
| Grantee: | Laudemir Carlos Varanda |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/18542-4 - Synthesis snd characterization of graphene/nanoparticles (FePt, Fe3O4) composites by the modified polyol method |
| Grantee: | Rebecca Faggion Albers |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 12/02093-3 - Synthesis of Co@Au (superparamagnetics) and CdSe@Zn (quantum dots) core@shell nanostructures for applications as antineoplasia agents |
| Grantee: | João Batista Souza Junior |
| Support Opportunities: | Scholarships in Brazil - Doctorate |