Iron Oxide Iii
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. Zeolite-SPION Nanocomposite for Ammonium and Heavy Metals Removal from Wastewater
Minimizing the emission of industrial effluents and realizing the recovery/extraction of key elements such as the rare earths from low concentration solutions, or during water decontamination processes, are some of the biggest challenges of modern society. Accordingly, the preparation and characterization of a low cost recyclable and reusable superparamagnet
J. Braz. Chem. Soc.. Publicado em: 2020-11
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2. Magneto-Responsive Hydrogels: Preparation, Characterization, Biotechnological and Environmental Applications
Hydrogels are hydrophilic three-dimensional networks able to hold large amount of water and hydrophilic molecules. Magneto-responsive hydrogels comprise of magnetic nanoparticles dispersed in polymeric networks that can be manipulated under external magnetic field. This review aims at (i) giving a brief overview on the evolution of hydrogels until the design
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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3. Enhancing the Supercapacitive and Superparamagnetic Performances of Iron Oxide Nanoparticles through Yttrium Cations Electro-chemical Doping
A one-pot electrosynthesis platform is reported for fabrication of Y3+ doped iron oxide nanoparticles (Y-IONPs). In this procedure, Y-IONPs are electro-deposited from an additive-free aqueous solution of iron(III) nitrate, iron(II) chloride and yttrium chloride. The analysis data provided by X-ray diffraction (XRD), field emission electron microscopy (FE-SEM
Mat. Res.. Publicado em: 10/07/2018
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4. Yerba Mate Tea Extract: a Green Approach for the Synthesis of Silica Supported Iron Nanoparticles for Dye Degradation
This work describes a green approach to the synthesis of iron nanoparticles supported in silica using tea extract of the South American plant yerba mate (Ilex paraguariensis). Catalysts with different iron contents were obtained according to the reaction conditions employed. Characterization by X-ray powder diffraction (XRD) and scanning electron microscopy
J. Braz. Chem. Soc.. Publicado em: 2016-11
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5. Otimização reológica de suspensões aquosas de óxido de ferro (III)
In this work the dispersion of iron oxide III particles in aqueous media was studied. To achieve the maximum solid content zeta potential measurements were carried as a function of pH. The influences of two different types of polyacrylates as dispersants were investigated. Suspensions were produced by varying solids concentration up to 30 vol.%. The results
Matéria (Rio J.). Publicado em: 2015-03
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6. Ca alginate as scaffold for iron oxide nanoparticles synthesis
Recently, nanotechnology has developed to a stage that makes it possible to process magnetic nanoparticles for the site-specific delivery of drugs. To this end, it has been proposed as biomaterial for drug delivery system in which the drug release rates would be activated by a magnetic external stimuli. Alginate has been used extensively in the food, pharmac
Brazilian Journal of Chemical Engineering. Publicado em: 2008-12
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7. Materiais à base de óxido de ferro para oxidação de compostos presentes no efluente da despolpa do café
Materials based on pure iron oxide and impregnated with niobia (Nb2O5) were prepared. Their catalytic activities were tested on the oxidation of compounds present in the wastewater from the processing of coffee berries. Particularly caffeine and catechol were tested. The oxidation reactions were carried out with the following systems (i) UV/H2O2, (ii) photo-
Química Nova. Publicado em: 2008
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8. Processos redoxes de ferro em argilominerais: caracterização, métodos de quantificação, especiação e modificações estruturais
Redox processes within clays and clay minerals influence significantly in different physical and chemical properties in soils and sediments, mainly which ones related to the chemical interaction between solid and solution phases (liquid or gas) such as superficial charge and ion dynamics. Other, like expansibility, water retention capacity, surface area, and
Publicado em: 2007
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9. Sintese e caracterização de nanoparticulas de oxidos de ferro para aplicações biomedicas / Synthesis and characterization of iron oxides nanoparticles for biomedical applications
In this work, morphological, structural and magnetic investigations were performed in iron oxide nanoparticles synthesized by chemical methods. Our goal was to correlate the synthesis parameters to the characteristics of the produced particles to improve their quality when compared to commercial samples and to evaluate their applicability in biomedicine. The
Publicado em: 2007
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10. Mineralogy, micromorphology, genesis and classification of Luvisols e Planosols developed from metamorphic rocks in the semi-arid of Brazilian Northeast / Mineralogia, micromorfologia, gênese e classificação de Luvissolos e Planossolos desenvolvidos de rochas metamórficas no semi-árido do Nordeste brasileiro
The semi-arid areas of Northeast Brazil have approximately 750,000 km2, corresponding to 60% of the total region extension. In this bioclimatic domain, exception for the sedimentary Paleo/Mesozoic areas, the soils have small poor to moderate development degree and are classified as Neosols, Luvisols and Planosols, sometimes surveyed as soil associations, in
Publicado em: 2007
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11. Estudo da oxidação de pirita em meio alcalino através de modelagem termodinâmica e de análises por difração de raios-x, espectroscopia de infravermelho e raman
An investigation of pyrite oxidation in alkaline solutions by thermodynamic modeling and analyses by Xray diffraction, infrared and Raman spectroscopy was carried out. The effect of pH and solution composition on the nature of the oxide product and complex formation is explained. A mechanism is proposed to explain the increase of the oxidation rates in carbo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2005
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12. Antimonio (V) disperso na superficie de silica gel : sintese, caracterização e propriedades
The antimony (V) oxide was obtained in highly dispersed form on a silica gel surface (Sb/SiO2), at a concentration of 0.65 atoms.nm, by grafting synthesis, and was reproducible for several preparations. After carrying out the XPS analysis, only Sb(V) ions in the Sb/SiO2 material were observed, which unlike the unsupported form, did not suffer any reduction b
Publicado em: 1992