Synthesis of magnetite nanoparticles from mineral waste

Kumar, Rohit; Sakthivel, R.; Behura, Reshma; Mishra, B.K.; Das, Dipankar

doi:10.1016/j.jallcom.2015.05.089

Cited by 67 publications

(18 citation statements)

References 49 publications

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“…Thermoanalytical data of magnetite (Figure a), HMS (Figure b), HMS‐Mag (Figure c), and non‐calcined HMS‐Mag (Figure d) are compiled in the Table . The first mass loss (event I) for all materials was assigned to the loss of physisorbed water molecules, consistent with the DTA endothermic peak ,. The magnetite TGA‐DTA curve (Figure a) showed a second mass loss event due to dehydratation of FeOOH species, an impurity of Fe 3 O 4 ,.…”

Section: Resultssupporting

confidence: 64%

“…The first mass loss (event I) for all materials was assigned to the loss of physisorbed water molecules, consistent with the DTA endothermic peak ,. The magnetite TGA‐DTA curve (Figure a) showed a second mass loss event due to dehydratation of FeOOH species, an impurity of Fe 3 O 4 ,. The DTA exothermic peak at 531 °C is related to phase transition to hematite .…”

Section: Resultssupporting

confidence: 63%

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Magnetic HMS silica as a Support to Immobilization of Catalysts Based on Cationic Manganese Porphyrins

et al. 2017

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The immobilization of cationic manganese porphyrins (MnP) over the surface of a magnetic hexagonal HMS silica (HMS‐Mag) produced a solid with high surface area and relatively homogeneous pores. Given the presence of the magnetite, the catalysts are easily recovered and reused without loss of mass. The MnP immobilization explored the strong interaction between the positive charges of the cationic MnP and the deprotonated Si‐OH groups on the surface of HMS‐Mag. Soret bands on the UV‐Vis spectra of the MnP‐loaded HMS‐Mag confirmed the presence of MnP on the prepared solids. The catalytic efficiency, robustness, and reusability of the prepared solids were investigated on cis‐cyclooctene and cyclohexane oxidations. The solids showed similar or higher catalytic efficiency than the corresponding MnP under homogeneous catalysis, with selectivity for cyclohexanol in cyclohexane oxidation. Additionally, the solid catalysts showed high resistance against deactivation, confirming the reusability capacity in at least five cycles of cyclooctene oxidation.

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Section: Resultssupporting

confidence: 64%

Section: Resultssupporting

confidence: 63%

Magnetic HMS silica as a Support to Immobilization of Catalysts Based on Cationic Manganese Porphyrins

et al. 2017

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“…Thus, it is important to stand out that the largest magnetite nanoparticles that still show superparamagnetic properties are the best to be used in adsorption and catalysis systems 26 . A saturation magnetization of 49 emu/g was measured, which is in the range of values (30 to 80 emu/g) reported in the literature (at 300 K) for synthetic magnetite fine powders 23,36,38 . The saturation magnetization is influenced by particle size, morphology, shape anisotropy 37 , and impurities in the sample.…”

Section: Characterization Of Industrial Magnetite-rich Powdermentioning

confidence: 51%

“…According to the literature, in all cases, magnetite for core-shell synthesis is prepared from diluted aqueous solutions of chemical reagents such as iron salts, e.g. FeCl 3 and FeCl 2 , iron nitrates or sulfates, and bases such as ammonia or alkaline hydroxides 17,[23][24][25][26] . On a large scale, this synthesis procedure will lead to environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Fe3O4-TiO2 and Fe3O4-SiO2 Core-shell Powders Synthesized from Industrially Processed Magnetite (Fe3O4) Microparticles

Noval

Carriazo

2019

Mat. Res.

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The interest for core-shells has been increased in the recent years due to their improved and modifiable properties. In this work, Fe 3 O 4 -TiO 2 and Fe 3 O 4 -SiO 2 core-shells were successfully synthesized from an industrially produced magnetite-rich powder with micro-and nanometric particle sizes, superparamagnetic behavior and saturation magnetization of 49 emu/g. The reverse microemulsion method was used to the synthesis of these core-shells. X-ray diffraction, energy dispersive X-ray analysis, electron microscopy (SEM-TEM), and magnetization curves were used to characterize the solids. Core-shells with different morphology and size, coating of crystalline TiO 2 (anatase) or amorphous silica, and superparamagnetic performance at room temperature (300 K) were obtained.

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“…Many researchers utilize this waste for its possible applications. Some researchers have synthesized magnetite nanoparticles by various methods using Fecontaining solution extracted from the iron ore tailing [1][2][3][4][5]. Yu et al [6] have successfully synthesized highly ordered mesoporous materials by hydrothermal method using sodium silicate extracted from iron ore tailing as silica source.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Iron Ore Tailing for the Preparation of ?-Fe2O3 nanoparticles

Xu¹,

Deng²

2018

Proceedings of the 4th Annual International Conference on Material Engineering and Application (ICMEA 2017)

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Abstract-The objective of this study was to recover the iron from the iron ore tailing and convert it into a value-added products like α-Fe 2 O 3 nanoparticles with photocatalytic properties. Iron was extracted from the iron ore tailing by using acid leaching method and the leaching parameters were discussed. When the amount and concentration of HCl, leaching reaction temperature and time were fixed at 21.4ml, 30%, 100°C and 1.5h, respectively, the iron recovery reached 99.63%. Mesoporous α-Fe 2 O 3 nanoparticles were successfully prepared by a facile precipitation method using the acid leaching solution as the iron source. The α-Fe 2 O 3 samples were characterized by XRD, SEM, N 2 adsorption and UV-Vis spectroscopy. The crystallite size of α-Fe 2 O 3 was about 36nm and the specific surface area was 46.03m 2 /g. The mesoporous α-Fe 2 O 3 prepared from iron ore tailing displayed better photocatalytic activity for the degradation of methylene blue, which was similar to that of α-Fe 2 O 3 prepared from pure agent.

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Synthesis of magnetite nanoparticles from mineral waste

Cited by 67 publications

References 49 publications

Magnetic HMS silica as a Support to Immobilization of Catalysts Based on Cationic Manganese Porphyrins

Magnetic HMS silica as a Support to Immobilization of Catalysts Based on Cationic Manganese Porphyrins

Fe3O4-TiO2 and Fe3O4-SiO2 Core-shell Powders Synthesized from Industrially Processed Magnetite (Fe3O4) Microparticles

Utilization of Iron Ore Tailing for the Preparation of ?-Fe2O3 nanoparticles

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