Formation of Highly Reactive Species at the Interface Fe°–Iron Oxides Particles by Mechanical Alloying and Thermal Treatment: Potential Application in Environmental Remediation Processes

2005 ◽  
Vol 34 (8) ◽  
pp. 1172-1173 ◽  
Author(s):  
Flávia Cristina Camilo Moura ◽  
Grazielli Cristina Oliveira ◽  
Maria Helena Araujo ◽  
José Domingos Ardisson ◽  
Waldemar Augusto de Almeida Macedo ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Mechanical Alloying ◽  
Iron Oxides ◽  
Potential Application ◽  
Environmental Remediation ◽  
Reactive Species

scholarly journals Impact of Gadolinium on the Structure and Magnetic Properties of Nanocrystalline Powders of Iron Oxides Produced by the Extraction-Pyrolytic Method

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4147
Author(s):  
Vera Serga ◽  
Regina Burve ◽  
Mikhail Maiorov ◽  
Aija Krumina ◽  
Ramūnas Skaudžius ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Thermal Treatment ◽  
Iron Oxides ◽  
Caproic Acid ◽  
Transformation Process ◽  
Nanocrystalline Powders ◽  
Preparation Conditions ◽  
Oxide Phases

Interest in magnetic nanoparticles is primarily due to their practical use. In this work, for the production of nanocrystalline powders of pure and gadolinium doped iron oxides, the extraction-pyrolytic method (EPM) was used. As a precursor, either iron-containing extract (iron (III) caproate in caproic acid) or its mixture with gadolinium-containing extract (gadolinium (III) valerate in valeric acid) was used. The mixed precursor contained 0.5 mol %, 2.5 mol %, 12.5 mol %, 50 mol %, and 75 mol % gadolinium in relation to the iron content. The formation of iron oxide phases, depending on the preparation conditions, was investigated. According to the results obtained, it was demonstrated that the presence of more than 2.5 mol % gadolinium additive in the mixed precursor inhibits the magnetite-to-hematite transformation process during thermal treatment. Produced samples were characterized by XRD and SEM methods, and the magnetic properties were studied.

scholarly journals Synthesis of an Anticorrosive Pigment by Thermal Treatment of Iron Oxides from Steel Industry Wastes

2019 ◽  
Vol 28 (52) ◽  
pp. 43-58
Author(s):  
María Angélica Colpas-Ruiz ◽  
Camilo Gnecco-Molina ◽  
Gabriel Antonio Jiménez-Rodríguez ◽  
José Andrés Pérez-Mendoza ◽  
Óscar Fabián Higuera-Cobos
Keyword(s):  
Iron Oxide ◽  
Thermal Treatment ◽  
Iron Oxides ◽  
Steel Industry ◽  
Powder Steel ◽  
Total Iron ◽  
X Ray Diffraction ◽  
X Ray ◽  
Industry Waste ◽  
Different Temperatures

This work reports the obtaining of an anticorrosive pigment composed mainly of hematite (ɑ-Fe2O3) from a powder steel industry waste from rust scale of rebar steel. This residue is mainly composed of Fe2O3 (87.97 %), SiO2 (6.13 %), CaO (1.88 %), Al2O3 (1.30%) and MnO (0.77 %). The total iron oxide of the residue is constituted by the following crystalline phases: magnetite, maghemita, lepidocrocita, wüstite, goethite and hematite. The production of a pigment with a high content of hematite was possible thanks to the high content of precursor iron oxides, which were calcined at different temperatures (750-850 °C) and holding times (0.5-1.50 h). For characterizing the iron content chemically and to identify their iron oxides phases, it was used X-ray fluorescence (XRF) and X-ray diffraction (XRD). The results showed that the pigment with the highest amount of hematite (ɑ-Fe2O3) was obtained at a calcination temperature of 850 °C and a holding time of 1.00 h.

scholarly journals Photochemistry of P,N-bidentate rhenium(i) tricarbonyl complexes: reactive species generation and potential application for antibacterial photodynamic therapy

RSC Advances ◽  
2021 ◽  
Vol 11 (51) ◽  
pp. 31959-31966
Author(s):  
Alison Acosta ◽  
Javier Antipán ◽  
Mariano Fernández ◽  
Gaspar Prado ◽  
Catalina Sandoval-Altamirano ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Potential Application ◽  
Reactive Species ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Rhenium Tricarbonyl

Three P,N-rhenium tricarbonyl complexes exhibited photoisomerization upon irradiation at 365 nm, and no CO release was detected. The antibacterial activity is attributed to their singlet oxygen generation, following the same decreasing order: RePNBr > RePNTfO > RePNNBr.

Niobian iron oxides as heterogeneous Fenton catalysts for environmental remediation

LACAME 2008 ◽  
2009 ◽  
pp. 27-34
Author(s):  
Diana Q. L. Oliveira ◽  
Luiz C. A. Oliveira ◽  
Enver Murad ◽  
José D. Fabris ◽  
Adilson C. Silva ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Environmental Remediation ◽  
Heterogeneous Fenton

scholarly journals The Effect of Additive Element on the Properties of Mechanically Alloyed Fe-Y2O3 Alloys

2017 ◽  
Vol 62 (2) ◽  
pp. 1043-1046
Author(s):  
Jung-Ho Ahn ◽  
Tae Kyu Kim ◽  
Jeongsuk Ahn
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Mechanical Alloying ◽  
Iron Oxides ◽  
Mechanically Alloyed ◽  
Reduction Of Oxides

Abstract In the present work, we have examined the effect of Ti on the properties of Fe-Y2O3 alloys. The result showed that the addition of Ti was effective for improving mechanical properties. This is due to the reduction of oxides by Ti during mechanical alloying and hot-consolidation. In particular, iron oxides are effectively reduced by the addition of Ti. Compared to the pristine Fe-Y2O3 alloys, titanium-added alloys exhibited fine and uniform microstructures, resulting in at least 60% higher tensile strength.

New method of mechanical alloying of ODS steels using iron oxides

2006 ◽  
Vol 101 (6) ◽  
pp. 566-576 ◽  
Author(s):  
V. V. Sagaradze ◽  
A. V. Litvinov ◽  
V. A. Shabashov ◽  
N. F. Vil’danova ◽  
A. G. Mukoseev ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Iron Oxides ◽  
New Method ◽  
Ods Steels
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