Process optimization on methyl orange discoloration in Fe3O4/RGO-H2O2 Fenton-like system

Abstract The development of a catalyst with high catalytic activity was one of the most important issues for the heterogeneous Fenton-like process. In this study, nanocomposites of Fe3O4 anchored onto reduced graphene oxide (RGO) were prepared by a moderate alkaline-thermal precipitation method and...

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Bibliographic Details
Published inWater science and technology Vol. 77; no. 12; pp. 2929 - 2939
Main Authors Xu, Huan-Yan, Wang, Yuan, Shi, Tian-Nuo, He, Xiu-Lan, Qi, Shu-Yan
Format Journal Article
LanguageEnglish
Published London IWA Publishing 01.08.2018
Subjects
Catalysis
Catalysts
Catalytic activity
Chemical engineering
Discoloration
Dyes
Efficiency
Graphene
Hydrogen peroxide
Iron oxides
Mathematical models
Microscopy
Nanocomposites
Nanoparticles
Optimization
Oxidation
Photocatalysis
Pollutants
Polynomials
Porous materials
Predictions
Reaction time
Response surface methodology
Strong interactions (field theory)
Three dimensional analysis
Variance analysis
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Summary:Abstract The development of a catalyst with high catalytic activity was one of the most important issues for the heterogeneous Fenton-like process. In this study, nanocomposites of Fe3O4 anchored onto reduced graphene oxide (RGO) were prepared by a moderate alkaline-thermal precipitation method and developed as highly efficient heterogeneous Fenton-like catalysts. The characterization results indicated that Fe3O4 nanoparticles (NPs) were tightly anchored onto few-layer RGO sheets via a strong interaction. Contrast experiments showed that Fe3O4/RGO nanocomposites had much better Fenton-like catalytic activity than Fe3O4 NPs. The process optimization of methyl orange (MO) discoloration in Fe3O4/RGO-H2O2 system was accomplished by central composite design under response surface methodology. A second-order polynomial model was established to predict the optimal values of MO discoloration and its significance was evaluated by analysis of variance. Three-dimensional response surfaces for the interaction between two variables were constructed. Based on the model prediction, the optimum conditions for MO discoloration in Fe3O4/RGO-H2O2 system were 2.9 for solution pH, 16.5 mM H2O2 concentration, 2.5 g/L catalyst dosage and 33.5 min of reaction time, with the maximum predicted value for MO discoloration ratio of 99.98%.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2018.293