Decolorization of wastewater by heterogeneous Fenton reaction using MnO2-Fe3O4/CuO hybrid catalysts. Issue 2 (April 2021)

• Record Type: Journal Article
• Authors: Ghasemi, Homa; Mozaffari, Saeed; Mousavi, Seyed Hesam; Aghabarari, Behzad; Abu-Zahra, Nidal
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 2(2021)
• Publication Date: 2021-04
• Subjects: Decolorization -- Catalyst efficiency -- Reaction kinetic -- Fenton's reaction -- MnO2-Fe3O4/CuO hybrid catalyst -- Methylene blue; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105091
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Decolorization of wastewater by Fenton oxidation process was conducted using Fe3 O4 /CuO and MnO2 -Fe3 O4 /CuO hybrid catalysts prepared via co-precipitation and impregnation methods, respectively. The chemical structure, surface area and porosity of hybrid nanoparticles were characterized using XRD, EDS, FE-SEM and BET techniques. The experimental results reveal that the introduction of MnO2 to Fe3 O4 /CuO catalyst (i.e. MnO2 -Fe3 O4 /CuO) enhances the rate of decolorization reaction due to the larger catalyst surface area and narrower pore size distribution, in comparison with Fe3 O4 /CuO, as well as the direct oxidation of methylene blue via Mn 4+ and Mn 3+ . In particular, MnO2 -Fe3 O4 /CuO revealed higher methylene blue removal efficiency than Fe3 O4 /CuO during 45 min reaction time (90% vs. 79%). Reaction analyses show that both catalysts follow a second-order reaction kinetic where MnO2 -Fe3 O4 /CuO exhibit a higher decolorization rate constant (118 vs. 57 L.mg −1 min −1 ) toward removal of methylene blue (MB) dye. Additionally, the effect of reaction conditions including pH, dosage of hydrogen peroxide, and concentrations of catalyst and methylene blue on the catalytic performance of MnO2 -Fe3 O4 /CuO were investigated. The synthesized hybrid nanostructured catalyst, MnO2 -Fe3 O4 /CuO, revealed excellent color removal efficiency with high reusability after six runs (removal efficiency > 90%). Graphical Abstract: ga1 Highlights: The introduction of Mn to Fe3 O4 /CuO catalyst (i.e. MnO2 -Fe3 O4 /CuO) enhances the rate of decolorization reaction. The degradation of methylene blue via hybrid catalysts follows a second-order reaction kinetic. The reaction parameters such as H2 O2 dosage, catalyst and dye concentrations influence the color removal efficiency. MnO2 -Fe3 O4 /CuO revealed excellent color removal efficiency (> 90%) with high reusability after six runs.