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Fenton-like degradation of methylene blue using Mg/Fe and MnMg/Fe layered double hydroxides as reusable catalysts
Abstract In this work, the Layered Double Hydroxide (LDH) containing magnesium (Mg) and iron (Fe) was modified with Mn to investigate the effect of the addition from the structural and catalytic point of view. These materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses, and evaluated as heterogeneous catalysts in Fenton-like reaction. The results showed that the Mn was incorporated in the LDH, promoting structural changes such as reduction of crystallographic parameters, decrease of crystallite size, and increase of surface area. The removal of methylene blue (MB) in aqueous solutions by LDH with and without Mn showed better results with increasing catalyst dosage, H2O2 volume, and temperature; and that under the best reaction conditions, the MnMgFe-LDH was the catalyst more efficient in removing MB, being reused for 5 reaction cycles with more than 80% removal.
Graphical abstract Display Omitted
Highlights LDH was synthesized by a coprecipitation method for use as a Fenton catalyst. The insertion of Mn in the LDH sharply increased the consumption of H2O2. Catalytic wet peroxide oxidation of methylene blue showed the highest efficiency over MnMgFe-LDH. Reuse of the LDHs showed good efficiency of the Fenton-like reaction. The LDHs showed structural stability after 5 reuse cycles.
Fenton-like degradation of methylene blue using Mg/Fe and MnMg/Fe layered double hydroxides as reusable catalysts
Abstract In this work, the Layered Double Hydroxide (LDH) containing magnesium (Mg) and iron (Fe) was modified with Mn to investigate the effect of the addition from the structural and catalytic point of view. These materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses, and evaluated as heterogeneous catalysts in Fenton-like reaction. The results showed that the Mn was incorporated in the LDH, promoting structural changes such as reduction of crystallographic parameters, decrease of crystallite size, and increase of surface area. The removal of methylene blue (MB) in aqueous solutions by LDH with and without Mn showed better results with increasing catalyst dosage, H2O2 volume, and temperature; and that under the best reaction conditions, the MnMgFe-LDH was the catalyst more efficient in removing MB, being reused for 5 reaction cycles with more than 80% removal.
Graphical abstract Display Omitted
Highlights LDH was synthesized by a coprecipitation method for use as a Fenton catalyst. The insertion of Mn in the LDH sharply increased the consumption of H2O2. Catalytic wet peroxide oxidation of methylene blue showed the highest efficiency over MnMgFe-LDH. Reuse of the LDHs showed good efficiency of the Fenton-like reaction. The LDHs showed structural stability after 5 reuse cycles.
Fenton-like degradation of methylene blue using Mg/Fe and MnMg/Fe layered double hydroxides as reusable catalysts
Gonçalves, Rosembergue Gabriel Lima (author) / Mendes, Hana Moreira (author) / Bastos, Sibele Lima (author) / D'Agostino, Lídia Cristina (author) / Tronto, Jairo (author) / Pulcinelli, Sandra Helena (author) / Santilli, Celso Valentim (author) / Neto, Jonas Leal (author)
Applied Clay Science ; 187
2020-01-25
Article (Journal)
Electronic Resource
English
Degradation of Methylene Blue by Fenton-Like Reaction
| British Library Conference Proceedings | 2015
| British Library Online Contents | 2018
| British Library Online Contents | 2018