A simple and novel synthetic route to prepare anatase TiO2 nanopowders from natural ilmenite via the H3PO4/NH3 process

Palliyaguru, L.; Kulathunga, Ushan S.; Jayarathna, Lakruwani I.; Jayaweera, Champa Disala; Jayaweera, P.M.

doi:10.1007/s12613-020-2030-3

Cited by 36 publications

(18 citation statements)

References 54 publications

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“…Rutile was the only phase identified in the sample calcined at 900 °C. Rate of photodegradation of Rhodamine B by the synthesized anatase TiO 2 under UV irradiation (25.4 × 10 -3 min −1 ) is much higher than with synthesized rutile, 1.24 × 10 -3 min −1 and commercially available anatase and rutile TiO 2 [75].…”

Section: Leaching Using Weak Acidsmentioning

confidence: 78%

“…Reported data indicate that highly pure TiO 2 where Fe 2 O 3 is present as the main impurity in some cases but in low concentrations is produced by almost all the treatment methods. Presence of impurities such as Fe 2 O 3 have altered the theoretical band gap values [75]. Produced Titania contains either anatase or rutile polymorphs or both anatase and rutile.…”

Section: Information From Characterization Techniquesmentioning

confidence: 99%

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Leaching of ilmenite to produce titanium based materials: a review

2021

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Naturally available ilmenite mineral is being used as a starting material to produce titanium based products that have wide applications. Transformation of ilmenite to different titanium based materials by strong and weak acid, and base digestion, is discussed. Effects of temperature, concentration of acid/base, reaction time on dissolution of ilmenite are extensively reviewed. Characterization of the starting materials, intermediates and the products by x-ray diffraction, thermogravimetry, brunauer–emmett–teller surface area analysis, and scanning electron microscopy are presented. Further, advantages and disadvantages associated with the digestion methods are discussed.

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Section: Leaching Using Weak Acidsmentioning

confidence: 78%

Section: Information From Characterization Techniquesmentioning

confidence: 99%

Leaching of ilmenite to produce titanium based materials: a review

2021

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“…Another titanium-bearing compound on the Moon is titanian chromite, but it is much less abundant than ilmenite. Anatase transforms irreversibly to the other titanium dioxide polymorph, rutile, at elevated temperatures higher than 800 °C. , Therefore, the transformation of the titanium-bearing compound into anatase happened after the high-temperature events of the travel to the ground. Taking this into account, it is highly probable that the presence of anatase in the NWA 11273 meteorite may be due to an alteration related to the oxidation of the Fe(II) in ilmenite to form irreversibly hematite and anatase .…”

Section: Results and Discussionmentioning

confidence: 99%

Geochemical Characterization of the NWA 11273 Lunar Meteorite Using Nondestructive Analytical Techniques: Original, Shocked, and Alteration Mineral Phases

Huidobro

Aramendia

Arana

et al. 2021

ACS Earth Space Chem.

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A lunar feldspathic breccia meteorite, the Northwest Africa (NWA) 11273, was analyzed to compensate the lack of scientific data available about its mineralogy and geochemistry. In order to obtain a deeper characterization of the sample, a strategy based on the combination of nondestructive spectroscopic techniques such as X-ray fluorescence and Raman spectroscopy is used. Both techniques are being used in spatial missions by the Perseverance Rover, so their combination in the laboratory is here proposed as an optimal strategy to study the complete mineralogy of the sample. In addition to finding the minerals indicated by the Meteoritical Society (anorthite, olivine, pyroxene, kamacite, and troilite), other minor minerals were identified, such as zircon and ilmenite, which are minerals related to the Moon geology, as well as calcite and sulfate which can be considered products of terrestrial weathering. Finally, secondary minerals related to alteration processes were also found, such as hematite, quartz, and anatase. In this work, the alteration processes that gave rise to the detected secondary minerals have been proposed.

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“…In recent decades, many methods have been developed for the comprehensive utilization of TMC, such as direct reduction (Liu et al, 2014;Sui et al, 2017;Zhou et al, 2019), direct acid leaching (Zhao et al, 2013;Palliyaguru et al, 2020), selective chlorination (Zheng et al, 2017), and low-temperature reduction-water leaching (Zhang et al, 2018). The carbothermal reduction method has obvious advantages in the economic and environmental aspects (Li et al, 2019;Liu et al, 2013;Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of mechanical activation on carbothermic reduction and nitridation of titanomagnetite concentrates

Wen¹,

Yu²,

Zeng³

et al. 2021

Physicochem. Probl. Miner. Process.

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The carbothermic reduction and nitridation process of titanomagnetite concentrates with the help of mechanical activation were investigated by particle size analysis, thermodynamic calculation, thermogravimetric analysis, X-ray diffraction analysis, scanning electron microscopy, and energydispersive spectroscopy analysis. The thermogravimetric and X-ray diffraction results indicated that either the reduction of iron oxide or the reduction and nitridation of M3O5 to TiN could be promoted significantly with the increase in activation time. The results obtained from scanning electron microscopy and energy-dispersive spectroscopy showed that, when samples were not activated, chunks of and thin M3O5 were derived from the reduction of ilmenite and titanomagnetite. They were severely sintered with impurities to form a dense structure. As a result, M3O5 was difficult to be converted to TiN, especially chunks of M3O5. However, when samples were activated, the sintering degrees of the impurity and M3O5 were mitigated, and the particle size of the iron as a medium for delivering C to M3O5 was decreased in the roasted product. This condition enhanced the diffusion of C to the surface of M3O5. Meanwhile, the bulk of ilmenite was broken in the activation process, which prevented the formation of chunks of M3O5. Thus, the conversion of M3O5 to TiN was promoted.

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A simple and novel synthetic route to prepare anatase TiO2 nanopowders from natural ilmenite via the H3PO4/NH3 process

Cited by 36 publications

References 54 publications

Leaching of ilmenite to produce titanium based materials: a review

Leaching of ilmenite to produce titanium based materials: a review

Geochemical Characterization of the NWA 11273 Lunar Meteorite Using Nondestructive Analytical Techniques: Original, Shocked, and Alteration Mineral Phases

Effect of mechanical activation on carbothermic reduction and nitridation of titanomagnetite concentrates

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