Preparation and photo-fenton degradation activity of α-Fe2O3 nanorings obtained by adding H2PO4−, SO42−, and citric acid

Liu, Huating; Tong, Mengli; Zhu, Kaili; Liu, Hui; Chen, Rufen

doi:10.1016/j.cej.2019.123010

Cited by 42 publications

(11 citation statements)

References 41 publications

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“…The α-Fe 2 O 3 particles obtained at 500 • C showed the highest decomposition efficiency. Liu et al [19] synthesized nanoring-type α-Fe 2 O 3 by adding H 2 PO 4 , SO 4 2− , and citric acid in a hydrothermal reaction and reported increased photo-Fenton decomposition of p-nitrophenol by activating photoabsorption and increasing surface-coupled Fe 2+ content. Jiang et al [20] reported that α-Fe 2 O 3 /BiOI catalysts showed 3 and 10 times higher decomposition efficiency than BiOI and α-Fe 2 O 3 catalysts in methyl orange, phenol, and tetracycline hydrochloride decomposition.…”

Section: Introductionmentioning

confidence: 99%

Hematite/Graphitic Carbon Nitride Nanofilm for Fenton and Photocatalytic Oxidation of Methylene Blue

Lee

Park

2020

Sustainability

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Hematite (α-Fe2O3)/graphitic carbon nitride (g-C3N4) nanofilm catalysts were synthesized on fluorine-doped tin oxide glass by hydrothermal and chemical vapor deposition. Scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses of the synthesized catalyst showed that the nanoparticles of g-C3N4 were successfully deposited on α-Fe2O3 nanofilm. The methylene blue degradation efficiency of the α-Fe2O3/g-C3N4 composite catalyst was 2.6 times greater than that of the α-Fe2O3 single catalyst under ultraviolet (UV) irradiation. The methylene blue degradation rate by the α-Fe2O3/g-C3N4 catalyst increased by 6.5 times after 1 mM of hydrogen peroxide (H2O2) was added. The photo-Fenton reaction of the catalyst, UV, and H2O2 greatly increased the methylene blue degradation. The results from the scavenger experiment indicated that the main reactants in the methylene blue decomposition reaction are superoxide radicals photocatalytically generated by g-C3N4 and hydroxyl radicals generated by the photo-Fenton reaction. The α-Fe2O3/g-C3N4 nanofilm showed excellent reaction rate constants at pH 3 (Ka = 6.13 × 10−2 min−1), and still better efficiency at pH 7 (Ka = 3.67 × 10−2 min−1), compared to other methylene blue degradation catalysts. As an immobilized photo-Fenton catalyst without iron sludge formation, nanostructured α-Fe2O3/g-C3N4 are advantageous for process design compared to particle-type catalysts.

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Section: Introductionmentioning

confidence: 99%

Hematite/Graphitic Carbon Nitride Nanofilm for Fenton and Photocatalytic Oxidation of Methylene Blue

Lee

Park

2020

Sustainability

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“…1b. The peak at 3441 cm −1 corresponds to the stretching vibration of O-H from water adsorbed by the sample (Salavati-Niasari et al attributed to Fe-C = O and Fe-CO stretching mode, respectively, due to the functional groups of citric acid present in the sample (Salla et al 2020;Liu et al 2020;Kazakov et al 2020). Moreover, the absorption peaks at 1156, 781 and 502 cm −1 can be assigne to In-O stretching and bending vibrations (Rey et al 2005;Majeed Khan et al 2013).…”

Section: Characterization Of Fein 2 Smentioning

confidence: 99%

Novel application of FeIn2S4 as an efficient photo-Fenton catalyst for degradation of Ponceau 4R in aqueous solution

Grassi

Salla

Jahn

et al. 2021

Int. J. Environ. Sci. Technol.

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The chalcogenide composite FeIn 2 S 4 was prepared by hydrothermal route and, for the first time, investigated as a heterogeneous catalyst in the photo-Fenton treatment for Ponceau 4R dye (C 20 H 11 N 2 Na 3 O 10 S 3 ) under visible irradiation. The composite was characterized by X-ray diffraction (DRX), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectrometry (EDS) and elemental mapping, band gap energy and X-ray photoelectron spectroscopy (XPS). The optimal experimental conditions were investigated and determined to be pH 3.0, 0.5 g L −1 of catalyst and 2.5 mmol L −1 of H 2 O 2 . A decolorization efficiency of 93.3% was achieved in 60 min of reaction and a TOC removal of 92.3% was reached in 180 min. The stability and recycle capacity of FeIn 2 S 4 indicated that the catalyst can be used more than four times without considerable loss of efficiency. Free radicals investigation revealed that • OH and O 2•− radicals were the major oxygen reactive species involved on Ponceau 4R degradation. The lower-mass intermediates from Ponceau 4R degradation were identified, and a mechanism for the photo-Fenton treatment was suggested. Therefore, the composite showed a performance that makes it a promising catalyst for removing emerging contaminants in water.

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“…The observed light-dependent current fluctuations in the subsequent stages of the chronoamperometric experiment could be related either to the photosensitivity of the electrode composite ingredients or to the presence of the biological component in the system interacting with the metal ions from the electrodes. Several papers provide evidence about photoactivity of nanostructured iron and manganese oxides produced by different methods for a variety of photocatalytic applications [17,[30][31][32][33][34][35]. Novel nano-carbon based materials such as graphene and graphene quantum dots also demonstrate a size-tunable photoresponse, providing a new way for the creation of low cost, high performance carbon-based devices [36].…”

Section: Electrochemical Analyses Of Modified Electrodes In the Presementioning

confidence: 99%

Graphite–Metal Oxide Composites as Potential Anodic Catalysts for Microbial Fuel Cells

et al. 2020

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In this study, graphite–metal oxide (Gr–MO) composites were produced and explored as potential anodic catalysts for microbial fuel cells. Fe2O3, Fe3O4, or Mn3O4 were used as a catalyst precursor. The morphology and structure of the fabricated materials were analyzed by scanning electron microscopy and X-ray diffraction, respectively, and their corrosion resistance was examined by linear voltammetry. The manufactured Gr–MO electrodes were tested at applied constant potential +0.2 V (vs. Ag/AgCl) in the presence of pure culture Pseudomonas putida 1046 used as a model biocatalyst. The obtained data showed that the applied poising resulted in a generation of anodic currents, which gradually increased during the long-term experiments, indicating a formation of electroactive biofilms on the electrode surfaces. All composite electrodes exhibited higher electrocatalytic activity compared to the non-modified graphite. The highest current density (ca. 100 mA.m−2), exceeding over eight-fold that with graphite, was achieved with Gr–Mn3O4. The additional analyses performed by cyclic voltammetry and electrochemical impedance spectroscopy supported the changes in the electrochemical activity and revealed substantial differences in the mechanism of current generation processes with the use of different catalysts.

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Preparation and photo-fenton degradation activity of α-Fe2O3 nanorings obtained by adding H2PO4−, SO42−, and citric acid

Cited by 42 publications

References 41 publications

Hematite/Graphitic Carbon Nitride Nanofilm for Fenton and Photocatalytic Oxidation of Methylene Blue

Hematite/Graphitic Carbon Nitride Nanofilm for Fenton and Photocatalytic Oxidation of Methylene Blue

Novel application of FeIn2S4 as an efficient photo-Fenton catalyst for degradation of Ponceau 4R in aqueous solution

Graphite–Metal Oxide Composites as Potential Anodic Catalysts for Microbial Fuel Cells

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