Fenton-like degradation of methylene blue using Mg/Fe and MnMg/Fe layered double hydroxides as reusable catalysts

Gonçalves, Rosembergue Gabriel Lima; Mendes, Hana Moreira; Bastos, Sibele Lima; D'Agostino, Lídia Cristina; Tronto, Jairo; Pulcinelli, Sandra Helena; Santilli, Celso Valentim; Neto, Jonas Leal

doi:10.1016/j.clay.2020.105477

Cited by 43 publications

(14 citation statements)

References 55 publications

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“…The value of the parameter a is in positive correlation with the diameter of the TM ion. Although the diameter of the Mn 2+ ion is 83 pm, the lattice parameter a for aMO_Mn is slightly lower than for pure HT_x (pyroaurite), which is probably due to the partial amount of Mn built into the HT structure as trivalent ions (64.5 pm) . On the other hand, no correlations were observed for the lattice parameter c (describing the distance of three layers, determined as c = 3 d 003 ).…”

Section: Results and Discussionmentioning

confidence: 87%

“…Although the diameter of the Mn 2+ ion is 83 pm, the lattice parameter a for aMO_Mn is slightly lower than for pure HT_x (pyroaurite), which is probably due to the partial amount of Mn built into the HT structure as trivalent ions (64.5 pm). 13 On the other hand, no correlations were observed for the lattice parameter c (describing the distance of three layers, determined as c = 3d 003 ). The parameter c depended on the amount and type of bonded anions and water and the distance of the metal in the crystal lattice which were the same for all prepared HTs.…”

Section: Characterization Of Synthesized Materialsmentioning

confidence: 99%

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Transition Metal-Promoted Mg-Fe Mixed Oxides for Conversion of Ethanol to Valuable Products

et al. 2023

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The conversion of ethanol into petrochemicals, such as ethyl and butyl acetate, butanol, hexanol, and so forth was studied. The conversion was catalyzed by Mg-Fe mixed oxide modified with a second transition metal (Ni, Cu, Co, Mn, or Cr). The main aim was to describe the influence of second transition metal on (i) the catalyst itself and (ii) reaction products such as ethyl acetate, butanol, hexanol, acetone, and ethanal. Moreover, the results were compared with the results of pure Mg-Fe. The reaction was carried out in the gas phase in a flow reactor with a weight hour space velocity of 4.5 h–1 for 32 h at three reaction temperatures (280, 300, and 350 °C). The metals Ni and Cu in Mg-Fe oxide enhanced the ethanol conversion due to the population of active dehydrogenation sites. Despite the lower acido-basicity, Cu, Co, and Ni supported the yield of ethyl acetate, and Cu and Ni also promoted the yield of higher alcohols. Ni was related to the extent of the gasification reactions. Moreover, long-term stability (by leaching of metals) test was carried out for all catalysts (128 h).

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Section: Results and Discussionmentioning

confidence: 87%

Section: Characterization Of Synthesized Materialsmentioning

confidence: 99%

Transition Metal-Promoted Mg-Fe Mixed Oxides for Conversion of Ethanol to Valuable Products

et al. 2023

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“…XPS is an important method for studying the surface chemical state, element composition, and functional groups of composite materials, , as shown in Figure a–d. The total spectrum of ZnAl-LDO@BB indicates the presence of C, O, N, Zn, and Al, and the relative intensity of the Zn 2p peak is higher than that of the Al 2p peak, which is in line with the volume ratio used to prepare the material.…”

Section: Results and Discussionmentioning

confidence: 99%

Green Removal of Various Pollutants by Microsphere Adsorption: Material Characterization and Adsorption Behavior

Deng

et al. 2020

Energy Fuels

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Layered double-oxide/biochar composites (ZnAl-LDO@BB) were successfully prepared by a hydrothermal method and are used to adsorb different pollutants. High-resolution transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy were used to characterize the ZnAl-LDO@BB. The synthesized ZnAl-LDO@BB were regular microspheres, and ZnAl nanosheets were regularly embedded on the surface of the banana biochar. The adsorption properties of ZnAl-LDO@BB for four adsorbates in aqueous solution were evaluated by batch adsorption experiments. The results showed that ZnAl-LDO@BB can quickly and effectively adsorb Congo red (CR), methyl orange (MO), total phosphorus (TP), and hexavalent chromium [Cr(VI)]. Adsorption conformed to the Langmuir model and pseudo-second-order (PSO) kinetic equation, and the adsorbed amounts of CR, MO, TP, and Cr(VI) calculated by the Langmuir model were 344.83, 588.24, 322.58, and 64.52 mg/g, respectively. The mechanism of the adsorbate removal by ZnAl-LDO@BB involves surface functional group complexation, pore adsorption, and interlayer channel adsorption. Based on these results, ZnAl-LDO@BB is a multifunctional green material for water treatment and has good application prospects.

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“…It demonstrated that Ni-Al LDH was carbonate LDH and exhibited the lamellar structure with high crystallinity. [24] The FTIR spectrum of LDH was portrayed in Figure 2b. The broad absorption peak at 3476 and 1635 cm −1 was attributed to the stretching and bending vibration of hydroxyl groups for layer and interlayer water.…”

Section: Characterizationmentioning

confidence: 99%

Nickel‐Aluminum Hydrotalcite for Improving Flame Retardancy and Smoke Suppression of Intumescent Flame Retardant Polypropylene: Preparation, Synergy, and Mechanism Study

Jiang

Liu

Yang

et al. 2022

Macro Materials & Eng

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Intumescent flame retardants (IFR) are widely used in the field of flame retardant polypropylene (PP), but their flame retardant efficiency and smoke suppression properties need to be further improved. Herein, a Ni-Al LDH (layered double hydroxide) is obtained successfully by coprecipitation and microwave hydrothermal technique and used as a synergist to improve the flame-retardant and smoke-suppression properties of triazine-based IFR. The results showed that IFR/Ni-Al LDH exhibited the best synergistic effect when the IFR is replaced by 5 wt% Ni-Al LDH. 17 wt% IFR/Ni-Al LDH enabled the PP composites to achieve UL-94 V-0 rating with a high LOI of 29.8%. Besides, the introduction of Ni-Al LDH effectively decreased the heat and smoke release of the PP/IFR composites due to its catalytic charring effect. This is mainly attributed that the introduction of metal ions in Ni-Al LDH effectively improved the strength and crosslinking degree of char layer and promoted the formation of a cohesive and dense char layer. The formed high-quality char layer effectively exerted the barrier effect in condensed phase. Therefore, the PP/IFR/Ni-Al LDH composites exhibited excellent flame-retardant and smoke-suppression performance. This investigation provided a facile way to prepare environment-friendly and high-performance flame retardant PP composites with wide application prospects.

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Fenton-like degradation of methylene blue using Mg/Fe and MnMg/Fe layered double hydroxides as reusable catalysts

Cited by 43 publications

References 55 publications

Transition Metal-Promoted Mg-Fe Mixed Oxides for Conversion of Ethanol to Valuable Products

Transition Metal-Promoted Mg-Fe Mixed Oxides for Conversion of Ethanol to Valuable Products

Green Removal of Various Pollutants by Microsphere Adsorption: Material Characterization and Adsorption Behavior

Nickel‐Aluminum Hydrotalcite for Improving Flame Retardancy and Smoke Suppression of Intumescent Flame Retardant Polypropylene: Preparation, Synergy, and Mechanism Study

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