Fe
Mostrando 13-24 de 8575 artigos, teses e dissertações.
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13. Development and nutritional status of calla lily submitted to nutrient deficiency
Resumo O copo-de-leite é uma importante espécie para o setor de floricultura e o conhecimento acerca dos aspectos nutricionais da cultura são imprescindíveis para o seu cultivo comercial. Como ocorrem variações nos sintomas de deficiências nutricionais entre as espécies, torna-se necessário o estudo do desenvolvimento das plantas e do seu estado nut
Ornamental Horticulture. Publicado em: 2022
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14. Influence of the Local Structure on the Photocatalytic Properties of Zinc Spinel Ferrite Nanoparticles
The correlation between iron distribution in octahedral or tetrahedral sites in synthetic magnetite and zinc spinel ferrites and their catalytic properties were investigated in this work. The zinc-doped nanomagnetites were prepared by co-precipitation method and annealed at 420 °C. X-ray diffraction, UV-Vis, X-ray absorption and 57Fe Mössbauer spectroscopi
Journal of the Brazilian Chemical Society. Publicado em: 2022
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15. Remoção de chumbo (II) de solução aquosa por nanopartículas magnéticas (MnFe2O4) funcionalizadas com poliestireno sulfonado
RESUMO O presente estudo contempla a aplicação de nanopartículas magnéticas de ferrita de manganês MnFe2O4 (NPM) modificadas com poliestireno sulfonado (PSS) na adsorção de íons de Pb (II) para fins de tratamento de água contaminada. A funcionalização da nanopartícula com o polímero objetivou aumentar a capacidade de adsorção e incluir a utili
Engenharia Sanitaria e Ambiental. Publicado em: 2022
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16. Pretreatment and Enzymatic Saccharification of Water Hyacinth, Sugarcane Bagasse, Maize Straw, and Green Coconut Shell Using an Organosolv Method with Glycerol and FeCl3
A method to pretreatment of biomasses using glycerol as a green solvent was developed. Optimization of organosolv pretreatment was performed using a 23 factorial design, investigating synergism among the variables particle size (from < 0.85 to > 2.0 mm), FeCl3 concentration (0.025-0.175 mol L-1), and temperature (160-220 °C). Although the effects of the var
Journal of the Brazilian Chemical Society. Publicado em: 2022
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17. Phytocomponents, Evaluation of Anticholinesterase Activity and Toxicity of Hydroethanolic Extracts of Parkia platycephala Benth.
This study evaluated the chemical composition, antioxidant and anticholinesterase activities, and the toxicity of hydroethanolic extracts of the Parkia platycephala Benth. Hot extraction with 70% hydroethanolic solution was used to obtain crude extracts of the leaf (LE), bark (BE), flower (FE), and seed (SE). Separation and identification of the compounds we
Journal of the Brazilian Chemical Society. Publicado em: 2022
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18. Analysis of dielectric and electrical transport properties of NdFeAsO ceramic
Abstract The iron-based ceramic NdFeAsO was synthesized by the solid-state reaction method. The tetragonal crystal structure was confirmed at room temperature through the X-ray diffraction technique. The dielectric characteristics i.e. dielectric constant (εr) and loss tangent (tanδ) of the sample were studied at a wide range of temperature and frequencies
Cerâmica. Publicado em: 2022
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19. Analysis of phosphorus recovery based on vivianite formation for practical applications
RESUMO O fósforo (P) é considerado um recurso não renovável. Dado seu consumo crescente na vida cotidiana, a “crise do P” é iminente. Para enfrentá-la, é urgente que novos recursos de P sejam encontrados. Este artigo resume o progresso das pesquisas sobre a recuperação de P baseada na formação de vivianita a partir de resíduos. Especificament
Engenharia Sanitaria e Ambiental. Publicado em: 2022
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20. Iron Cobaltite (FeCo2O4) Nanocatalysts for Water-Oxidation: Effects of Annealing Temperature on Catalytic Properties
The development of efficient, stable, and non-precious metal water oxidation catalysts (WOCs) is a matter of importance for sustainable energy research. In this work, iron cobaltite (FeCo2O4) nanoparticles were prepared by the coprecipitation method, and we present the effect of heat treatment (250, 350, 450, 650 and 900 °C) on the catalytic properties. Cat
Journal of the Brazilian Chemical Society. Publicado em: 2022
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21. Micronutrient content and accumulation in leaves and bunches of black pepper during two crop cycles
ABSTRACT A comprehensive knowledge about micronutrient dynamics in leaves and bunches of black pepper is needed in order to proper diagnose nutrient needs, and thus facilitate fertilization management. This study aimed to evaluate micronutrient concentration and accumulation in leaves and bunches of black pepper bunches to understand the crop nutritional dem
Revista Ceres. Publicado em: 2022
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22. Simple Spectrophotometric Determination of Iron in Diesel Oil after Sample Preparation Employing Extraction Induced by Emulsion Breaking
This work reports the development of a simple and fast method for the spectrophotometric determination of Fe in diesel oil using the classic reaction with 1,10-phenanthroline after its extraction induced by emulsion breaking (EIEB). The extraction parameters of EIEB were optimized (concentration of HNO3 and Triton X-100® in the emulsifying solution) as well
Journal of the Brazilian Chemical Society. Publicado em: 2022
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23. Conflictividad socio-ambiental por uso de agroquímicos en Salta, Santiago del Estero y Santa Fe, Argentina
Resumen El objetivo del artículo es contribuir a la comprensión y visibilización de los conflictos y controversias en torno al uso de agroquímicos en las provincias de Santa Fe, Santiago del Estero y Salta, Argentina. Se relevaron y sistematizaron fuentes de información secundaria, con el fin de llevar adelante un primer análisis contextual de los marc
Ciência & Saúde Coletiva. Publicado em: 2022
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24. Selective formation of neodymium phosphate from iron-neodymium magnet waste
Abstract Neodymium-iron-boron alloy, Nd2Fe14B, is used as a material for magnets. Neodymium is one of the valuable and expensive rare earth elements and is often recovered to reduce costs and environmental impact. Recently, a method for recovering neodymium as neodymium phosphate from mixed solutions was reported. This method was very useful because the main
Cerâmica. Publicado em: 2022