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Articoli di riviste sul tema "Iron oxides"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Pfretzschner, Hans-Ulrich. "Iron oxides in fossil bone." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 220, no. 3 (2001): 417–29. http://dx.doi.org/10.1127/njgpa/220/2001/417.

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2

Guo, Hang, Linxian Liao, Junzeng Xu, et al. "Dual Role of Iron Oxides in Stabilizing Particulate and Mineral-Associated Organic Carbon Under Field Management in Paddies." Agriculture 15, no. 13 (2025): 1385. https://doi.org/10.3390/agriculture15131385.

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The interactions between iron oxides and organic carbon within the particulate organic matter (POM) and mineral-associated organic matter (MAOM) fractions in paddy soils remain insufficiently understood, yet they are likely crucial for unlocking the carbon sequestration potential of these systems. In this study, we investigated the distribution of soil iron oxides and organic carbon within POM and MAOM fractions following 10 years of continuous irrigation and organic amendment management. We also examined the relationship between iron oxide transformation and these two SOC (soil organic carbon

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3

Kim, I. H., W. S. Kim, and D. S. Rhee. "Photocatalytic Activity of Fe/Ti Mixed Oxide for Degrading Humic Acid in Water." Advanced Materials Research 717 (July 2013): 95–100. http://dx.doi.org/10.4028/www.scientific.net/amr.717.95.

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The comparative experiments for removing humic acid as environmental pollutant were conducted by adsorption on iron oxide, photooxidation in the presence of titanium dioxide catalyst and combined adsorption-photooxidation by iron-titanium mixed metal oxides, where all these active components were immobilized on polypropylene granules. The main purpose of the work was the combination of adsorption and photocatalytic oxidation processes to remove humic acid. The granules with iron-titanium mixed oxide for treating humic acid gave much better results with 1.2~3 times higher removal rates comparin

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4

Yudinugroho, Maulana, Sutarto, Setia Pambudi, et al. "Identification of Ferric Iron Oxides, Ferrous Iron Oxides, and Hydroxyls Minerals Within The Coastal Areas of Kulon Progo Indonesia Using Landsat 8 Multispectral." IOP Conference Series: Earth and Environmental Science 1486, no. 1 (2025): 012025. https://doi.org/10.1088/1755-1315/1486/1/012025.

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Abstract The development of remote sensing technology has facilitated the rapid detection of minerals without direct contact with the site. Multispectral satellite imagery can identify iron minerals, including Ferric Iron Oxides, Ferrous Iron Oxides, and Hydroxyls. That mineral is usually found on the surface along the southern coast of Central Java - Yogyakarta and has a characteristic black and shiny colour. This research aims to identify and map iron oxide minerals in parts of the southern coast of Java, specifically the surrounding Kulonprogo region, using Landsat 8 OLI imagery, focusing o

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5

Jeong, D., K. Kim, and W. Choi. "Accelerated dissolution of iron oxides in ice." Atmospheric Chemistry and Physics Discussions 12, no. 8 (2012): 20113–34. http://dx.doi.org/10.5194/acpd-12-20113-2012.

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Abstract. Iron dissolution from mineral dusts and soil particles is vital as a source of bioavailable iron in various environmental media. In this work, the dissolution of iron oxide particles trapped in ice was investigated as a~new pathway of iron supply. The dissolution experiments were carried out in the absence and presence of various organic complexing ligands under dark condition. In acidic pH conditions (pH 2, 3, and 4), the dissolution of iron oxides was greatly enhanced in the ice phase compared to that in water. The dissolved iron was mainly in the ferric form, which indicates that

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6

Jeong, D., K. Kim, and W. Choi. "Accelerated dissolution of iron oxides in ice." Atmospheric Chemistry and Physics 12, no. 22 (2012): 11125–33. http://dx.doi.org/10.5194/acp-12-11125-2012.

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Abstract. Iron dissolution from mineral dusts and soil particles is vital as a source of bioavailable iron in various environmental media. In this work, the dissolution of iron oxide particles trapped in ice was investigated as a new pathway of iron supply. The dissolution experiments were carried out in the absence and presence of various organic complexing ligands under dark condition. In acidic pH conditions (pH 2, 3, and 4), the dissolution of iron oxides was greatly enhanced in the ice phase compared to that in water. The dissolved iron was mainly in the ferric form, which indicates that

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7

BRUCHAJZER, ELŻBIETA, BARBARA FRYDRYCH, and JADWIGA SZYMAŃSKA. "Iron oxides – calculated on Fe Documentation of proposed values of occupational exposure limits (OELs)." Podstawy i Metody Oceny Środowiska Pracy 33, no. 2(92) (2017): 51–87. http://dx.doi.org/10.5604/01.3001.0009.9360.

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Iron (III) oxide, (Fe2O3, nr CAS 1309-37-1) in natural conditions occurs as iron ore. The most common (hematite) contains about 70% pure iron. Iron (III) oxide is used as a red dye in ceramics, glass and paper industries and as a raw material for abrasive metalworking (cutting). Iron (II) oxide, (FeO, CAS 1345-25-1) occurs as a mineral wurtzite and is used as a black dye in cosmetics and as a component of tattoo ink. Iron (II) iron (III) oxide (Fe3O4, CAS 1309-38-2; 1317- -61-9) is a common mineral. It has strong magnetic properties (so called magnetite). It occurs in igneous rocks (gabbro, ba

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8

Plemiannikov, Mykola, та Nataliіa Zhdanіuk. "Determination of the influence of temperature, concentration of ferric oxides and oxidative conditions of glass boiling on the displacement of the equilibrium of ferric oxides Fе2O3↔FеO". Technology audit and production reserves 3, № 1(71) (2023): 10–14. http://dx.doi.org/10.15587/2706-5448.2023.283267.

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The object of research is the state of equilibrium of ferrum(II) and ferrum(III) oxides in glass melts at temperatures of 1000–1400 °С, welded in oxidizing, neutral and reducing conditions with a content of ferrum oxides up to 1.5 %. This problem is relevant in the following aspects. The first aspect of this problem is the unwanted coloring of the glass: FeO colors the glass blue, and Fe2O3 – yellow. The combined presence of ferrum(II) oxide and ferrum(III) oxide determines the gradations of glass shades that fall on the green spectrum. The second aspect concerns the thermophysics of processes

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9

Zhang, Lin, Di Lun Sheng, Rui Zhang, En Yi Chu, Ju Peng Liu, and Sheng Li Zhou. "Preparation of Self-Assembled Iron Oxide Nanorings with Nano-Aluminum." Applied Mechanics and Materials 446-447 (November 2013): 210–13. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.210.

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To make fuels and oxides react better, Iron oxide nanoring was synthesized using hydrothermal method and then self-assembled with nano aluminum particles. Iron oxide were characterized by hollow column morphology with outer diameters of 200-240nm, inner diameters of 90-120nm and heights of 120-150nm using SEM and TEM. Iron oxide and aluminum were evenly distributed and contact closely by self-assembly.The touch of fuels and oxides increased effectively.While the ultrasonically-mixed sample scattered randomly and aggregated seriously. Self-assembly is proved to be a effective method for the tou

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10

Zhu, Yi. "The influence of iron oxides on wheel–rail contact: A literature review." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 232, no. 3 (2017): 734–43. http://dx.doi.org/10.1177/0954409716689187.

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In contrast to other third-body layers – such as water, oil, sand, and leaves – iron oxides exert a constant influence on the friction and wear of wheel–rail contact. However, studies that focus on the influence of iron oxides have not been conducted systematically until the 21st century. This study is a comprehensive presentation of early and recent research works related to the influence of iron oxides on the wheel–rail contact. The characteristics of iron oxides in general and those between railway wheels and rails are discussed. A comparison of various laboratory tests and their relation t

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11

Al-Hamawandi, M. J., D. R. Azeez, and D. K. Ali. "Behavior and Distribution of Free Iron Oxides in Some Soil Orders in Iraq." IOP Conference Series: Earth and Environmental Science 1252, no. 1 (2023): 012067. http://dx.doi.org/10.1088/1755-1315/1252/1/012067.

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Abstract This study was conducted to investigating the behavior of free iron oxides in some soil orders in Iraq. Soil samples were collected from five Pedons for soil orders Entisols, Aridisols, Inceptisols, Vertisols and Mollisols. Total free iron oxides (Fed) were extracted by CBD, amorphous iron oxides by acid ammonium oxalate and iron oxide linked with organic matter by alkaline Sodium pyrophosphate. the distribution of iron oxides in (Fep) to crystallized iron oxides were compared. The results showed that (Fed-Feo) there is no particular direction that controls the vertical distribution o

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12

Moro, Koua, Aimé Serge Ello, Konan Roger Koffi, and N’goran Séverin Eroi. "Mixed Maghemite/Hematite Iron Oxide Nanoparticles Synthesis for Lead and Arsenic Removal from Aqueous Solution." Journal of Nanomaterials 2023 (April 26, 2023): 1–8. http://dx.doi.org/10.1155/2023/8216889.

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This work focused on the synthesis of iron oxide nanoparticles by the coprecipitation method with three basic solutions, namely, NH4OH, KOH, and NaOH. The synthesized iron oxides were characterized by various techniques such as XRD, MET, BET, and a SQUID magnetometer. The results showed nanosized particles of 13.2, 9.17, and 8.42 nm and different phases associated to maghemite and maghemite/hematite. The surface areas were 113, 94, and 84 m2/g and the magnetization strength were 58, 61, and 75 emu/g to iron oxides synthesized with NaOH, KOH, and NH4OH, respectively. The magnetic iron oxides ob

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13

Nurhadi, Mukhamad, Ratna Kusumawardani, Teguh Wirawan, Sin Yuan Lai, and Hadi Nur. "Synergistic Ti-Fe Oxides on Fishbone-Derived Carbon Sulfonate: Enhanced Styrene Oxidation Catalysis." Indonesian Journal of Chemistry 23, no. 6 (2023): 1514. http://dx.doi.org/10.22146/ijc.80667.

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Fishbone-derived carbon sulfonate, modified through incipient wetness impregnation with titanium tetraisopropoxide and iron nitrate salts, displays catalytic activity in the oxidation of styrene with hydrogen peroxide (H2O2) as an oxidant. This was done to develop a cost-effective, non-toxic, and environmentally friendly bimetallic oxide catalyst, incorporating titanium and iron oxides on mesoporous-derived carbon fishbone to enhance styrene conversion and benzaldehyde selectivity in styrene oxidation using aqueous H2O2. The catalyst, featuring a combination of titanium and iron oxides on the

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14

Howitt, Julia A., Darren S. Baldwin, Gavin N. Rees, and Barry T. Hart. "Facilitated Heterogeneous Photodegradation of Dissolved Organic Matter by Particulate Iron." Environmental Chemistry 1, no. 3 (2004): 197. http://dx.doi.org/10.1071/en04005.

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Environmental Context. Iron oxides, as suspended minerals or as a colloidal phase, are common in Australian freshwater systems. Freshwater systems are also loaded with carbon-based substances, ‘dissolved organic matter’, but not all is biologically available as food to freshwater organisms. However, photochemical interactions between these iron oxides and dissolved organic matter provide a mechanism for biologically resistant carbon to re-enter the food web. Suspended iron oxides thus need to be considered in carbon cycles in aquatic ecosystems. Abstract. The photochemical degradation of disso

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15

Szpunar, Jerzy A., and Bae Kyun Kim. "High Temperature Oxidation of Steel; New Description of Structure and Properties of Oxide." Materials Science Forum 539-543 (March 2007): 223–27. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.223.

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The quality of steel sheets is strongly affected by the surface defects that can be generated during hot rolling and are often related to scales removal operation. These defects are related to rather complex high temperature oxidation processes. In order to reduce an occurrence of the defects, it is necessary to understand better the formation of iron oxides during high temperature oxidation, the structure of the interfaces with the substrate and between different oxide phases. However, due to the lack of good experimental research tools details of iron oxide microstructures were not investiga

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16

Ma, Chuan Guo, Hai Jun Zheng, Xiao Ming Li, and Liang Gao. "Preparation and Microwave Absorbing Properties of Iron Oxides/Carbon Nanotubes Compounds." Advanced Materials Research 548 (July 2012): 133–37. http://dx.doi.org/10.4028/www.scientific.net/amr.548.133.

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A Series of iron oxides/CNTs compounds were prepared using a method of impregnation with iron nitrate solution and followed thermal decomposition. The compounds were characterized by the means of scanning electronic microscope, X-ray diffraction and thermogravimetic analysis. The dielectric and microwave-absorbing properties of EP composites containing the different compounds were further measured in a specific frequency range. The results show that: CNTs show reduction at a high temperature, and can make products of the thermal decomposition of iron nitrate produce iron oxide nanoparticles wi

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17

Latta, Drew E., Christopher A. Gorski, and Michelle M. Scherer. "Influence of Fe2+-catalysed iron oxide recrystallization on metal cycling." Biochemical Society Transactions 40, no. 6 (2012): 1191–97. http://dx.doi.org/10.1042/bst20120161.

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Recent work has indicated that iron (oxyhydr-)oxides are capable of structurally incorporating and releasing metals and nutrients as a result of Fe2+-induced iron oxide recrystallization. In the present paper, we briefly review the current literature examining the mechanisms by which iron oxides recrystallize and summarize how recrystallization affects metal incorporation and release. We also provide new experimental evidence for the Fe2+-induced release of structural manganese from manganese-doped goethite. Currently, the exact mechanism(s) for Fe2+-induced recrystallization remain elusive, a

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18

Liu, Ming Da, Feng Jiang, Hui Sun, Dan Yang, Yu Long Zhang, and Yao Jing Wang. "Effect of Silicon on Phosphorus Adsorption of Two Synthetic Iron Oxides." Advanced Materials Research 726-731 (August 2013): 325–30. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.325.

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Iron oxides play an important role in controlling P activity and availability in environmental systems. Two iron oxides (goethite and ferrihydrite) were synthesized characterized by X-ray diffraction, transmission electron microscopy and N2 adsorption method. To investigate the effect of silicon on phosphorus adsorption of them, batch equilibration method was used. Attempts were made to explore the mechanisms involved by eliminating effects of pH and accompany ions. Results reveal that the ability of two kinds of iron oxides adsorbed phosphorus were as follows: ferrihydrite > goethite. Comp

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19

Kupková, Miriam, Martin Kupka, Renáta Oriňáková, and Radka Gorejová. "Microstructure, Stiffness and Corrosion of Bare and Phosphated Specimens Made by Sintering of Structured Iron-Iron Oxide Spheres." Defect and Diffusion Forum 405 (November 2020): 411–16. http://dx.doi.org/10.4028/www.scientific.net/ddf.405.411.

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Granulated iron oxide particles were incompletely reduced to structured particles comprised metallic iron and residual iron oxides. Structured particles were pressed into prismatic compacts and sintered. Some of sintered specimens were subsequently phosphatized and calcined. Specimens with an iron phosphate coating were found stiffer than specimens without coating. In Hanks' solution, a galvanic corrosion was induced by more noble iron oxides coupled to a less noble metallic iron. This could explain higher corrosion potentials and higher rates of iron dissolution in comparison with a pure iron

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20

AWAD, Hamdy Ahmed Mohamed, and Aleksey Valer’evich NASTAVKIN. "Mineralogical and geochemical studies of gabbroids in the East Central Desert, Egypt." NEWS of the Ural State Mining University 59, no. 3 (2020): 41–51. http://dx.doi.org/10.21440/2307-2091-2020-3-41-51.

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Relevance of the work. The study area is limited to the Central-Eastern Desert of Egypt, represented by various rock units in addition to the gabbro rock containing iron oxides. Research Objective. This work is devoted to detailed studies of the geology of gabbroid rock minerals and iron oxides. Methodology. This work includes both field work (creation of a new geological map for various rock units in the study area) and laboratory work (preparation of thin sections for petrographic and mineralogical studies using a polarizing microscope and a scanning electron microscope SEM). Results and the

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21

Kupková, M., M. Kupka, R. Oriňaková, and R. Gorejová. "Corrosion characteristics of sintered heterogeneous materials composed of iron and iron oxides." Koroze a ochrana materialu 64, no. 3 (2020): 72–78. http://dx.doi.org/10.2478/kom-2020-0011.

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Abstract In a coronary angioplasty or orthopaedic surgery, metallic implants are often used to provide mechanical support to the healing tissues. In some situations, this support is really needed only temporarily. After tissue recovery, the implant no longer provides any benefits and can trigger adverse reactions. An optimal solution might be the short-term implants which are able to decompose in situ and can be readily excreted from the body. Iron-based materials are promising candidates for application in biodegradable devices. For the successful application, the ability to control the mater

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22

Li, Ningjie, Jieyu Yu, Xiaojie Wang, Liu Chen, Hong Jiang, and Wenjie Zhang. "Growth, Oxidative Stress and Ability to Degrade Tetrabromobisphenol A of Phanerochaete chrysosporium in the Presence of Different Nano Iron Oxides." Water 16, no. 4 (2024): 567. http://dx.doi.org/10.3390/w16040567.

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In order to improve the performance of white rot fungi, especially the model species Phanerochaete chrysosporium in tetrabromobisphenol A (TBBPA) degradation, the strategy of synergizing Phanerochaete chrysosporium with nano iron oxides was considered; however, the effects of different nano iron oxides on Phanerochaete chrysosporium are still unknown. In this study, 20 nm γ-Fe2O3, 30 nm α-Fe2O3, 20 nm Fe3O4, and 200 nm Fe3O4 were used, and the fungal growth, oxidative stress, and ability to degrade TBBPA were monitored. The results showed that the addition of four nano iron oxides did not inhi

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23

Tarutis, W. J., and R. F. Unz. "Iron and manganese release in coal mine drainage wetland microcosms." Water Science and Technology 32, no. 3 (1995): 187–92. http://dx.doi.org/10.2166/wst.1995.0140.

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The primary mechanisms responsible for the removal and retention of iron, manganese, and sulfate in constructed wetlands receiving acidic mine drainage (AMD) include the formation of metal oxides and sulfides within the sediments. This study was initiated to determine the kinetics of metal ion liberation, under reducing conditions, from synthetic and naturally occurring iron and manganese oxides typically found in AMD precipitates. Rates of metal ion liberation were determined during time series incubations of an organic substrate (spent mushroom compost) to which five metal oxides of varying

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24

Bil'genov, A., A. R. Tabylbaeva, and P. A. Gamov. "Influence of Temperature and Holding Time on Number and Size of Metal Particles during Solid-Phase Reduction of Iron by Carbon." Solid State Phenomena 316 (April 2021): 496–501. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.496.

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There is a lack of complete understanding of the mechanism and kinetics of reduction of metals from oxides. This paper presents results and methods of a series of experiments on direct reduction of metals by solid carbon in the form of graphite from a complex oxide with a low iron content in a laboratory muffle furnace at temperatures of 1300, 1400, 1500, 1600 °C and holding time of 1, 3, 5, 7 hours. The statistical analysis of amount and average size of reduced iron particles inside the oxide was studied. Dependence of amount and average size of the reduced iron particles on temperature and t

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Setina, Janina, Alona Gabrene, Inna Juhnevica, and Gundars Mezinskis. "Characterization of Iron Oxide Nanoparticles for Sol-Gel Dip-Coating Method Prepared Thin Films." Advanced Materials Research 704 (June 2013): 275–80. http://dx.doi.org/10.4028/www.scientific.net/amr.704.275.

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The paper describes two methods of syntheses of iron oxides, microstructure and morphology of magnetite nanoparticles. Nanocomposite thin films of SiO2/Fe3O4 have been prepared with sol-gel dip coating technique: dip-coating from SiO2/Fe3O4 sol and encapsulation magnetite between two SiO2 layers. Structural and morphological characteristics of iron oxides particles and prepared film were analyzed by X-Ray Diffraction, SEM, FTIR, DTA, AFM. AFM topography of surface and measurements of roughness has shown that using iron oxide encapsulation between two SiO2 layers to provide the even distributio

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Van Dam, Remke L., Wolfgang Schlager, Mark J. Dekkers, and Johan A. Huisman. "Iron oxides as a cause of GPR reflections." GEOPHYSICS 67, no. 2 (2002): 536–45. http://dx.doi.org/10.1190/1.1468614.

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Iron oxides frequently occur as secondary precipitates in both modern and ancient sediments and may form bands or irregular patterns. We show from time-domain reflectometry (TDR) field studies that goethite iron-oxide precipitates significantly lower the electromagnetic wave velocity of sediments. Measured variations in magnetic permeability do not explain this decrease. The TDR measurements and a dielectric mixing model also show that neither electrical conductivity nor relative permittivity of the solid material are altered significantly by the iron-oxide material. From drying during all of

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Gareev, Kamil G. "Diversity of Iron Oxides: Mechanisms of Formation, Physical Properties and Applications." Magnetochemistry 9, no. 5 (2023): 119. http://dx.doi.org/10.3390/magnetochemistry9050119.

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Iron oxide compounds have naturally formed during the whole of Earth’s history. Synthetic compositions with iron oxides are produced with the use of various techniques and widely used for scientific and applied purposes. This review considers an attempt to classify all the information on different iron oxide compound formation mechanisms and intended applications in biomedicine, catalysis, waste remediation, geochemistry, etc. All the literature references analyzed were divided into several groups by their number of included iron oxide compounds: compositions containing only one compound (e.g.

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Hamed, Mai Hussein, David N. Mueller та Martina Müller. "Thermal phase design of ultrathin magnetic iron oxide films: from Fe3O4 to γ-Fe2O3 and FeO". Journal of Materials Chemistry C 8, № 4 (2020): 1335–43. http://dx.doi.org/10.1039/c9tc05921k.

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Thermodynamically “active” oxide interfaces alter the standard iron oxide phase diagram of complex heterostructures. By controlling the effective oxygen pressure, selected iron oxides phases can be designed through a thermal phase design.

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Litter, Marta I., and Miguel A. Blesa. "Photodissolution of iron oxides II: The lack of efficiency of thiocyanate." Canadian Journal of Chemistry 68, no. 5 (1990): 728–30. http://dx.doi.org/10.1139/v90-114.

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Thiocyanate does not enhance, and even inhibits, the photochemical dissolution of iron oxides at 254 nm. At low SCN− concentrations, surface complexes [Formula: see text] are formed only to a small extent due to the low affinity for the surface by the monovalent anion, and electron-hole pairs essentially recombine. At higher ligand concentrations, only the homogeneous photolysis of SCN− is observed. At 450 nm, there is no appreciable light absorption by the oxide but homogeneous photolysis of FeIII—SCN− complexes produces FeII, which dissolves the oxide by a reductive mechanism. Keywords: iron

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Zhang, Ming Huan, Qing Shao, Lu Yuan, Guang Wen Zhou, and Yi Qian Wang. "Mechanism of the Oxidation of Iron." Advanced Materials Research 709 (June 2013): 106–9. http://dx.doi.org/10.4028/www.scientific.net/amr.709.106.

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A layered structure of different iron oxides was produced by thermal oxidation of iron. The structure and microstructure of different layers were examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Selected area electron diffraction (SAED) was used to identify the structures of the different oxide layers. Two different structures of Fe2O3were found to co-exist. Based on our observation, a possible oxidation mechanism for iron was proposed. The results shed light on the oxidation process of metals and provide insight into the synthesis of iron oxides.

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Siddhartha, O. Sai, and S. V. Satyanarayana. "Iron Oxides' Influence on the Thermal Decomposition of Pure Ammonium Perchlorate: A Comprehensive Review." Scholars International Journal of Chemistry and Material Sciences 7, no. 04 (2024): 35–44. http://dx.doi.org/10.36348/sijcms.2024.v07i04.001.

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The combustion of ammonium perchlorate (AP) has long been a focal point in the development of solid rocket propellants, with particular attention paid to the catalytic effects of iron oxides. Beginning in the 1950s, researchers have diligently studied the kinetics and mechanisms underlying AP combustion, with a focus on both micron-sized and nano-sized iron oxide catalysts due to their widespread application in rocket formulations worldwide. This research effort specifically excludes investigations involving alternative iron oxide-based catalysts, such as doped or mixed oxides, or supported ir

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Zhang, Yuzhe, Bin Wang, Qian Cheng, Xinling Li, and Zhongyu Li. "Removal of Toxic Heavy Metal Ions (Pb, Cr, Cu, Ni, Zn, Co, Hg, and Cd) from Waste Batteries or Lithium Cells Using Nanosized Metal Oxides: A Review." Journal of Nanoscience and Nanotechnology 20, no. 12 (2020): 7231–54. http://dx.doi.org/10.1166/jnn.2020.18748.

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How to remove harmful heavy metal ions from waste batteries or lithium cells efficiently has been the focus of scholars. More and more metal oxides had been used to deal with the pollution of heavy metal caused by waste batteries in recent years. Nanostructured metal oxides have great potential because of their large comparative areas. The adsorption for these heavy metal ions can be further improved by using modified metal oxides as adsorbents. At present, iron oxide is widely used in this field. Other metal oxides have also been studied in removing these heavy metal ions. Compared to other m

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Liu, Xiangqian, and Weihua Hu. "Iron oxide/oxyhydroxide decorated graphene oxides for oxygen reduction reaction catalysis: a comparison study." RSC Advances 6, no. 35 (2016): 29848–54. http://dx.doi.org/10.1039/c5ra28038a.

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BENDRE, YU V., V. F. GORYUSHKIN, N. A. KOZYREV, R. A. SHEVCHENKO, and N. V. OZNOBIKHINA. "THERMODYNAMIC ASPECTS OF OXIDES REDUCING BY ALUMINUM AND TITANIUM AT THE THERMIT WELDING OF RAILS." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 77, no. 12 (2021): 1291–95. http://dx.doi.org/10.32339/0135-5910-2021-12-1291-1295.

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During aluminothermic welding of rails, formation of aluminum oxides can take place, which become centers of residual stresses forming resulting in cracks formation followed by fracture and destruction of the welding joint. It was proposed to add titanium scrap in the form of preliminary made powders to the welding thermites composition. At the replacement of aluminum by titanium, titanium oxides formation takes place providing higher resistance against cracks formation. Comparative estimation of thermodynamic properties [∆rH°(T), ∆rG°(T)] of thermite reactions with aluminum and titanium in th

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35

Kajitani, Tsuyoshi, Tomohiro Nozaki, and Kei Hayashi. "Thermoelectric Iron Oxides." Advances in Science and Technology 74 (October 2010): 66–71. http://dx.doi.org/10.4028/www.scientific.net/ast.74.66.

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P- and N-type thermoelectric iron oxides were developed. The p- and n-type thermoelectric iron oxides were based on delafossite-type CuFeO2 and spinel-type Fe3O4, respectively. The dimensionless figure of merit, ZT, of the bulk p- and n-type iron oxides were 0.15 and 0.10 at 1200K, respectively. The ZT values were improved by the introduction of nano-voids. The physical properties of these iron oxides are structurally unique because of the triangular, or “Kagome,” arrangement of FeO6 octahedra. The delafossite-type CuFeO2 becomes anti-ferromagnet at temperatures less than 20K. The inverse spin

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36

Cong, Zhiyuan, Shaopeng Gao, Wancang Zhao, et al. "Iron oxides in the cryoconite of glaciers on the Tibetan Plateau: abundance, speciation and implications." Cryosphere 12, no. 10 (2018): 3177–86. http://dx.doi.org/10.5194/tc-12-3177-2018.

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Abstract. Cryoconite is a mixture of impurities and ice visually represented by dark colors present in the ablation zone of glaciers. As an important constituent of light-absorbing impurities on the glacier surface, iron oxides influence the radiative properties of mineral dust and thus its impact on ice melting processes. In particular, the distinct optical properties between hematite and goethite (the major iron oxide species) highlight the necessity to obtain accurate knowledge about their abundance and geochemical behavior. Cryoconite samples from five glaciers in different regions of the

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37

Sulzberger, Barbara, Christophe Siffert, and Werner Stumm. "Oberflächen-Koordinationschemie und Redox-Prozesse: Zur Auflösung von Eisen(III)-oxiden unter Lichteinfluss." CHIMIA 42, no. 7-8 (1988): 257. https://doi.org/10.2533/chimia.1988.257.

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The solubility of iron in surface waters and atmospheric water is partially controlled by photochemical processes. The increase in the solubility of iron in natural aquatic systems occurs most efficiently through reductive dissolution of iron(III)(hydr)oxides. In the presence of light and suitable organic ligands, this process is not restricted to anoxic hypolimnetic water but may also take place in oxic epilimnetic water. As has been shown, processes at the surface and not transport processes control the dissolution kinetics. In light-induced dissolution of iron(III) (hydr)oxides, ligands may

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38

Rossman, George R., and Chi Ma. "Iridescent Iron Oxides." Minerals 15, no. 2 (2025): 108. https://doi.org/10.3390/min15020108.

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Abstract (sommario):

Iridescent iron oxides known as rainbow hematite and turgite are found in a variety of localities worldwide and display a variety of beautiful interference colors. Usually, there is a thin layer of nanocrystals containing aluminum and phosphorous coats, such as with hematite, although one example of aluminum with arsenic is presented. Infrared spectra of samples with thicker layers of these nanocrystals show absorption in the phosphate region. The thin films that range from tens to hundreds of nanometers thick are believed to cause the color. High-resolution secondary electron imaging shows th

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39

Wu, Yiqian, Cong Wang, Lan Wang, and Chen Hou. "Recent Advances in Iron Oxide-Based Heterojunction Photo-Fenton Catalysts for the Elimination of Organic Pollutants." Catalysts 15, no. 4 (2025): 391. https://doi.org/10.3390/catal15040391.

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Abstract (sommario):

Organic pollutants released into water bodies have posed a serious threat to aquatic ecosystems. The elimination of organic pollutants from water through the photo-Fenton process has attracted extensive attention. Among various photo-Fenton catalysts, iron oxides have been intensively studied due to their environmentally benign characteristics and abundance. However, the rapid recombination of photogenerated charge carriers (e−–h+) and slow Fe(III)/Fe(II) cycling of iron oxides restrict their catalytic performance. Thus, this state-of-the-art review focuses on the recent research development r

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40

Long, Nguyet Viet. "INVESTIGATION OF SURFACES OF NOVEL IRON OXIDES WITH GRAIN AND GRAIN BOUNDARY." Vietnam Journal of Science and Technology 56, no. 1A (2018): 226. http://dx.doi.org/10.15625/2525-2518/56/1a/12527.

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Hierarchical nano/microscale α-Fe2O3 iron oxide particle system was prepared by an improved and modified polyol method with the use of NaBH4 agent with high heat treatment at 900 °C in air. Here, α-Fe2O3 iron oxide particles with different shapes were analyzed. The morphologies of the surfaces of α-Fe2O3 iron oxide particles show the oxide structures with the different nano/microscale ranges of grain sizes. In this research, we have found that grain and grain boundary growth limits can be determined in α-Fe2O3 iron oxide structure. This leads to the possibility of producing new iron oxide stru

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41

Karimi, N., Henri Buscail, Frédéric Riffard, et al. "Effect of Lanthanum Sol-Gel Coating on the Oxidation Behaviour of the AISI 304 Steel at 1000°C." Materials Science Forum 595-598 (September 2008): 733–41. http://dx.doi.org/10.4028/www.scientific.net/msf.595-598.733.

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Abstract (sommario):

The aim of the present work is to investigate the effect of Lanthanum surface addition on the oxidation behaviour of the AISI 304 stainless steel, in air, at 1000°C. The in situ X-ray diffraction (XRD) analyses on the blank steel reveal that after the first 10h oxidation, a change in the structural composition of the oxide scale occurs. During the first ten hours oxidation an initial growth of chromia and Mn1,5Cr1,5O4 is observed. After 10 h oxidation, chromia is not detected anymore and iron-containing oxides such as hematite (Fe2O3) and iron chromite (FeCr2O4) are observed in the outer part

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42

Ye, Zhi Guo, Xian Liang Zhou, Hui Min Meng, Xiao Zhen Hua, Ying Hu Dong, and Ai Hua Zou. "The Electrochemical Characterization of Electrochemically Synthesized MnO₂-Based Mixed Oxides for Supercapacitor Applications." Advanced Materials Research 287-290 (July 2011): 1290–98. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1290.

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Abstract (sommario):

Nanostructured elements, including: manganese-molybdenum (Mn-Mo) oxide, manganese-molybdenum-tungsten (Mn-Mo-W) oxide, manganese-molybdenum-iron (Mn-Mo-Fe) oxide, manganese-molybdenum-cobalt (Mn-Mo-Co) oxide, manganese-vanadium-tungsten (Mn-V-W) oxide, manganese-vanadium-iron (Mn-V-Fe) oxide and manganese-iron (Mn-Fe) oxide, have been anodically deposited onto titanium substrates by employing an iridium dioxide interlayer (Ti/IrO2anode). The electrochemical characteristics of the resultant oxide deposits have been investigated by cyclic voltammetry (CV) in an aqueous 0.1 M Na2SO4solution. The

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43

Photos-Jones, E., A. Cottier, A. J. Hall, and L. G. Mendoni. "Kean Miltos: The Well-Known Iron Oxides of Antiquity." Annual of the British School at Athens 92 (November 1997): 359–71. http://dx.doi.org/10.1017/s0068245400016737.

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Abstract (sommario):

The island of Kea in the North Cyclades was well known in antiquity for its miltos, a naturally occurring red iron oxide valued for its colour and wide range of applications. By combining geological field work, physico-chemical analytical techniques, simulation (heating) experiments as well as simple laboratory tests, this paper describes the study of Kean iron oxides in an attempt to characterize this material which is still largely elusive in the archaeological record. The present work corroborates previous observations about the superior quality of some Kean iron oxides. Furthermore, it put

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44

Owonubi, Ayodele. "Pedogenic Forms of Iron in Soils Developed from Four Parent Materials." JOURNAL OF TROPICAL SOILS 25, no. 1 (2020): 47. http://dx.doi.org/10.5400/jts.2020.v25i1.47-52.

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Abstract (sommario):

Information on the distribution of various forms of iron in soils are valuable in the study of soil genesis. The objective of this study was to to evaluate the pedogenic forms of iron in soils developed over basement complex and basaltic parent materials of the study area. Geologic units considered in the basement complex area were granite gneiss, biotite granite and migmatite. Stratified random sampling formed the basis for field work. Soil sampling was carried out by digging at least two soil profile pits in each geologic unit. Organically bound, amourphous and total iron oxides were estimat

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45

Kapelyushin, Yu, V. Roshchin, and A. Roshchin. "Beneficiation of Vanadium and Titanium Oxides by Using Selective Extraction of Iron in Low-Titanium Magnetite Concentrate." Solid State Phenomena 265 (September 2017): 913–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.913.

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Abstract (sommario):

Issues with existing vanadium beneficiation stimulate the development of new technologies for wasteless production of vanadium. The present work investigates a possibility of beneficiation of vanadium and titanium oxides in a low-titanium magnetite concentrate by using selective reduction and extraction of iron. Iron was selectively reduced by coal without melting and separated from the oxide (slag) phase during further smelting operation. After the liquid-phase separation vanadium and titanium oxides were accumulated in a slag phase. The following products were produced: slag, containing vana

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46

Axinte, Ciprian, Claudia Nadejde, Manuela Ursache, et al. "Magnetic Submicron Powder Preparation and Characterization." Materials Science Forum 672 (January 2011): 281–85. http://dx.doi.org/10.4028/www.scientific.net/msf.672.281.

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Abstract (sommario):

The goal of this experimental study was to present a comparative analysis of iron oxides powders obtained by two alternative methods, i.e. the co-precipitation at high temperature from aqueous reaction medium of iron oxides and, respectively, the solvent free method for the preparation magnetite at room temperature. Vibrational absorption spectra evidenced the dominancy of magnetite in both samples, while the X-ray diffractograms revealed the submicron size as well as the presence of additional iron oxide, in the second sample prepared by solvent free method.

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47

Sheshukov, O. Yu, M. A. Mikheenkov, E. A. Vyaznikova, A. S. Bykov, and L. B. Vedmid’. "Changes in phase composition of soderites of the bakal deposit at heating." Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy 61, no. 11 (2018): 891–97. http://dx.doi.org/10.17073/0368-0797-2018-11-891-897.

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Abstract (sommario):

The article presents the results of a study of formation mechanism of magnesia-ferrite when heated siderites of the Bakal deposit with different iron oxide content in an inert and oxidizing atmosphere. It was established that in the case of firing in an inert atmosphere, the decomposition of siderite with high iron content begins at a lower temperature and the enthalpy of such decomposition is less. This effect can be explained by the different phase composition of the samples. The main phases formed under conditions of oxidative firing are hematite and magnesia-ferrite. The amount of hematite

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48

Jiang, Xueting, Hao Wu, and Aijun Deng. "Prediction of Reduction Recovery of Iron and Vanadium Oxides in Low-Grade Vanadium–Titanium Magnetite Based on Response Surface Model." Metals 15, no. 6 (2025): 595. https://doi.org/10.3390/met15060595.

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Abstract (sommario):

In this study, the effects of reduction temperature and time on the reduction rates of iron and vanadium oxides in low-grade vanadium–titanium magnetite (VTM) were investigated. Based on the results of physical experiments, both the response surface method (RSM) and central composite design (CCD) were used to fit the prediction model of the reduction rate of iron and vanadium oxides in low-grade VTM. The results of the RSM prediction model show that under the condition of a sufficient reducing medium, affected by the high-temperature products, such as silicates and magnesium aluminates, the re

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49

Alimin, A., L. O. Kadidae, L. Agusu, L. O. Ahmad, S. J. Santosa та A. Asria. "Formation Mechanisms of Co-existence of α-Fe and Iron Oxides Nanoparticles Decorated on Carbon Nanofibers by a Simple Liquid Phase Adsorption-Thermal Oxidation". Journal of New Materials for Electrochemical Systems 25, № 3 (2022): 200–205. http://dx.doi.org/10.14447/jnmes.v25i3.a07.

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Abstract (sommario):

We propose formation mechanisms of co-existence of α-Fe and iron oxides nanoparticles decorated on CNFs. The α-Fe nanoparticles are produced via oxidation-reduction mechanisms, which occur in liquid phase adsorption (LPA) assisted by ultrasonic energy, while α-Fe2O3 nanoparticles are thermally formed through mechanisms of Lewis acidbase. In addition, Fe3O4 is thermally formed by reducing Fe2O3 by CNFs. Liquid phase adsorption assisted by ultrasonic energy under ambient temperature using Fe(NO3)3•9H2O as a precursor of iron oxides and α-Fe has been applied. Then, as prepared, Fe(III)@CNFs were

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50

Halim, K. S. Abdel, A. A. El-Geassy, M. I. Nasr, Mohamed Ramadan, Naglaa Fathy, and Abdulaziz S. Al-ghamdi. "Characteristics and applications of iron oxides reduction processes." Polish Journal of Chemical Technology 26, no. 1 (2024): 39–50. http://dx.doi.org/10.2478/pjct-2024-0005.

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Abstract (sommario):

Abstract The present review handles the main characteristics of iron oxide reduction and its industrial applications. The reduction of iron oxide is the basis of all ironmaking processes, whether in a blast furnace or by direct reduction and/or direct smelting processes. The reduction characteristics of iron ores control the efficiency of any ironmaking process and the quality of the produced iron as well. Many controlling parameters should be considered when discussing the reducibility of iron ores such as equilibrium phase diagrams, reduction temperature, pressure, gas composition, and the n

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