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Magnetite

About: Magnetite is a research topic. Over the lifetime, 10277 publications have been published within this topic receiving 278071 citations.


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Journal ArticleDOI
TL;DR: In this article, the synthesis of magnetite nanoparticles with the iron recovered from acid mine drainage from the Mid Appalachian coal fields was investigated. But the results showed that most of the magnetite particles ranged from 10 to 15 nm and were spheroidical or cubic in shape.

110 citations

Journal ArticleDOI
TL;DR: In this article, the authors used magnetite powder to produce large quantities of nanostructured particles for As(III) and As(V) adsorption. But the results showed that these particles had high specific surface area but limited adorption capacity.

109 citations

Journal ArticleDOI
TL;DR: In this article, a multilinear regression equation was proposed to predict spinel spinel/melt partition coefficients for natural mafic liquids at relevant crystallization conditions.

109 citations

Journal ArticleDOI
TL;DR: In this paper, the use of iron oxide nanoparticles (19.3 nm magnetite and 37.0 nm hematite) was examined to remove arsenate and arsenite through column studies.
Abstract: There is a growing interest in the use of nanoparticles for environmental applications due to their unique physical and chemical properties. One possible application is the removal of contaminants from water. In this study, the use of iron oxide nanoparticles (19.3 nm magnetite and 37.0 nm hematite) were examined to remove arsenate and arsenite through column studies. The columns contained 1.5 or 15 wt% iron oxide nanoparticles and soil. Arsenic experiments were conducted with 1.5 wt% iron oxides at 1.5 and 6 mL/h with initial arsenate and arsenite concentrations of 100 μg/L. Arsenic release occurred after 400 PV, and 100% release was reached. A long-term study was conducted with 15 wt% magnetite nanoparticles in soil at 0.3 mL/h with an initial arsenate concentration of 100 μg/L. A negligible arsenate concentration occurred for 3559.6 pore volumes (PVs) (132.1 d). Eventually, the arsenate concentration reached about 20% after 9884.1 PV (207.9 d). A retardation factor of about 6742 was calculated indicating strong adsorption of arsenic to the magnetite nanoparticles in the column. Also, increased adsorption was observed after flow interruption. Other experiments showed that arsenic and 12 other metals (V, Cr, Co, Mn, Se, Mo, Cd, Pb, Sb, Tl, Th, U) could be simultaneously removed by the iron oxide nanoparticles in soil. Effluent concentrations were less than 10% for six out of the 12 metals. Desorption experiment showed partial irreversible sorption of arsenic to the iron oxide nanoparticle surface. Strong adsorption, large retardation factor, and resistant desorption suggest that magnetite and hematite nanoparticles have the potential to be used to remove arsenic in sandy soil possibly through in situ techniques.

109 citations

Journal ArticleDOI
TL;DR: In this article, the inner Fe-Cr spinel layer grows according to a mechanism involving void formation at the oxide/metal interface and the driving force for pore formation is the outward magnetite growth.
Abstract: Under CO2 exposure at an intermediate temperature, typically 550 °C, 9Cr–1Mo steel forms a duplex oxide scale made of an outer magnetite layer and an almost-as-thick inner Fe–Cr rich spinel oxide layer It is proposed that the inner Fe–Cr spinel layer grows according to a mechanism involving void formation at the oxide/metal interface The driving force for pore formation is the outward magnetite growth: iron vacancies are injected at the oxide/metal interface then condense into voids The fresh metallic surface made available is then oxidized by CO2, which diffuses fast through the scale The physical aspects, the integrity and the nature of the scale are shown to be very dependent on the oxygen potential existing in the environment

109 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023570
20221,277
2021367
2020478
2019494
2018446