Ramesh, M.Rao, M.P.Rossignol, F.Nagaraja, H.S.2026-02-052017Water Science and Technology, 2017, 76, 7, pp. 1652-16652731223https://doi.org/10.2166/wst.2017.291https://idr.nitk.ac.in/handle/123456789/25482Reduced graphene oxide (rGO) coated manganese dioxide (MnO<inf>2</inf>) nanowires (NWs) were prepared by the hydrothermal method. Raman spectra confirmed the presence of rGO and the Brunauer-Emmett-Teller surface area of rGO/MnO<inf>2</inf> NWs was found to be 59.1 m2g-1. The physico-chemical properties of prepared catalysts for the degradation of Reactive Black 5 (RB5) dye were investigated. 84% of RB5 dye in hydrogen peroxide solution was successfully degraded using rGO/MnO<inf>2</inf> NWs, while only 63% was successfully degraded with pristine ?-MnO<inf>2</inf> NWs in 60 min owing to the smaller crystallite size and large surface area. Further, the ultrasonic-combined Fenton process significantly enhanced the degradation rate to 95% of RB5 by the catalyst rGO/MnO<inf>2</inf> NWs due to synergistic effects. The decomposition products identified using gas chromatography-mass spectrometry revealed a higher production rate of fragments in the ultrasonic-combined Fenton process. Therefore, rGO/MnO<inf>2</inf> NWs with the ultrasonic-combined Fenton process is an efficient catalyst for the degradation of RB5, and may be used for environmental protection. © IWA Publishing 2017.CatalysisCatalystsChromatographyCrystallite sizeDegradationGrapheneManganese oxideMass spectrometryNanowiresBrunauer-emmett-teller surface areasDecomposition productsEfficient catalystsGas chromatography-mass spectrometryHydrothermal methodsMnO2 NWsPhysicochemical propertyReduced graphene oxides (RGO)Gas chromatographydyegraphene oxidehydrogen peroxidemanganese dioxidenanowirereactive black 5 dyereduced graphene oxideunclassified druggraphitemanganese derivativenaphthalenesulfonic acid derivativeorganic compoundoxideRemazol black Bblack carboncatalysiscatalystdecompositiondegradationoxide groupphysicochemical propertyreactive transportultrasonicsadsorptionArticlechemical structurecrystallizationdesorptionenvironmental protectionFenton reactionhydrothermal methodmass fragmentographynanocatalysisnanocatalystnanofabricationparticle sizephysical chemistryRaman spectrometryreaction timesurface areasuspended particulate matterultrasoundwater contentchemistryproceduressewagewater pollutantGas Chromatography-Mass SpectrometryGraphiteHydrogen PeroxideManganese CompoundsNaphthalenesulfonatesOrganic ChemicalsOxidesUltrasonicsWaste Disposal, FluidWater Pollutants, Chemical