Mechanistic studies of mercury adsorption and oxidation by oxygen over spinel-type MnFe2O4

Yang, Yingju; Liu, Jing; Zhang, Bingkai; Liu, Feng

doi:10.1016/j.jhazmat.2016.09.007

Cited by 189 publications

(84 citation statements)

References 41 publications

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“…Its consumption can be replenished by gas phase O 2 and Hg 0 oxidation by surface oxygen is regarded as a Mars–Maessen process [43]. The Mars–Maessen mechanism can be illustrated by Equations (3)–(7) [24].…”

Section: Resultsmentioning

confidence: 99%

“…In IM1, oxygen is adsorbed on the surface O-top atom with a 2.270 Å O–O top bond, while the Hg atom is adsorbed in a physical manner, as mentioned above, and the length of the Hg–O top bond is 2.339 Å. The distance between Hg 0 and surface oxygen is 2.109 Å, which is larger than the Hg–O bond length of the gas-phase HgO molecule [43]. Then Hg 0 moves toward the surface O atom and is oxidized by overcoming an energy barrier of 20.7 kJ/mol through transition state TS1.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the energy barrier of HgO forming on the CeO 2 (111) surface is also compared with that on other materials, such as V 2 O 5 /TiO 2 (001) and MnFe 2 O 4 (100) [43,44]. In both systems, the oxidation of Hg 0 by oxygen follows the Mars–Maessen mechanism.…”

Section: Resultsmentioning

confidence: 99%

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Mechanism of Mercury Adsorption and Oxidation by Oxygen over the CeO2 (111) Surface: A DFT Study

Zhao

Han

et al. 2018

Materials

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CeO2 is a promising catalytic oxidation material for flue gas mercury removal. Density functional theory (DFT) calculations and periodic slab models are employed to investigate mercury adsorption and oxidation by oxygen over the CeO2 (111) surface. DFT calculations indicate that Hg0 is physically adsorbed on the CeO2 (111) surface and the Hg atom interacts strongly with the surface Ce atom according to the partial density of states (PDOS) analysis, whereas, HgO is adsorbed on the CeO2 (111) surface in a chemisorption manner, with its adsorption energy in the range of 69.9–198.37 kJ/mol. Depending on the adsorption methods of Hg0 and HgO, three reaction pathways (pathways I, II, and III) of Hg0 oxidation by oxygen are proposed. Pathway I is the most likely oxidation route on the CeO2 (111) surface due to it having the lowest energy barrier of 20.7 kJ/mol. The formation of the HgO molecule is the rate-determining step, which is also the only energy barrier of the entire process. Compared with energy barriers of Hg0 oxidation on the other catalytic materials, CeO2 is more efficient at mercury removal in flue gas owing to its low energy barrier.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Mechanism of Mercury Adsorption and Oxidation by Oxygen over the CeO2 (111) Surface: A DFT Study

Zhao

Han

et al. 2018

Materials

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“…MnFe2O4 adalah material komposit spinel dengan struktur lattice kubus dan face centered. Katalis MnFe2O4 berfungsi efektif untuk menyerap merkuri dalam kontrol emisi di pembangkit listrik tenaga batu bara [9]…”

Section: Pendahuluanunclassified

Pengaruh Penambahan Nanokatalis MnFe2O4 Terhadap Proses Pirolisis Sampah Plastik HDPE

Wati

Wardana

Winarto

et al. 2018

JRM

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The effects of MnFe2O4 nanocatalyst addition toward HDPE plastic waste pyrolysis have been investigated by performing experiments on METTLER TOLEDE TGA DSC1 Simultaneous Thermal Analyzer at heating rates of 10 o C/min by nitrogen and temperatures range from room temperature to 1000 o C. The results of pyrolysis showed that the main polymer components of HDPE plastic waste, both, with and without MnFe2O4 nanocatalyst addition degraded in one stage. The MnFe2O4 nanocatalyst addition increases the maximum mass loss rate of HDPE plastic waste pyrolysis, however, it increase the degradation of the initial temperature.

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“…Several methods, such as chemical precipitation, membrane filtration, ionic exchange, solvent extraction, and adsorption, have been employed for the separation of Hg(II) ions [4,5,6,7,8]. Among them, adsorption appears to be a highly promising and widely used approach due to high efficiency, low cost, operability, and repeatability [9,10,11]. The key to this technology is exploring the effective adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of 3D Graphene–Silica Hydrogel Composite for Enhanced Removal of Mercury Ions

et al. 2019

Nanomaterials

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Adsorption is a highly promising and widely used approach to remove Hg(II) ions from contaminated water. The key to this technology is exploring the effective adsorbent. The three-dimensional (3D) graphene as reduced graphene oxide hydrogel (rGH)-encapsulated silica gel (SG-PEI/rGH) was prepared by a moderate chemical reduction strategy using ascorbic acid. This composite structure was characterized by FTIR, XRD, and SEM analysis and used as adsorbents for Hg(II) ions. Its adsorption capacity toward Hg(II) ions was 266 mg/g and increased about 32% compared with the silica gel because of reduced graphene oxide hydrogel (rGH). Mechanism study showed that the high adsorption ability was due to the formation of an N–Hg complex with multi-amino groups on the surface of polyethyleneimine-modified silica gel (SG-PEI) and the rapid diffusion of adsorbed ions attributed to the rGH network structure. This composite SG-PEI/rGH would be a promising material for the removal of Hg(II) ions.

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Mechanistic studies of mercury adsorption and oxidation by oxygen over spinel-type MnFe2O4

Cited by 189 publications

References 41 publications

Mechanism of Mercury Adsorption and Oxidation by Oxygen over the CeO2 (111) Surface: A DFT Study

Mechanism of Mercury Adsorption and Oxidation by Oxygen over the CeO2 (111) Surface: A DFT Study

Pengaruh Penambahan Nanokatalis MnFe2O4 Terhadap Proses Pirolisis Sampah Plastik HDPE

Facile Fabrication of 3D Graphene–Silica Hydrogel Composite for Enhanced Removal of Mercury Ions

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