Lixiviation
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Evaluation of the Structural Integrity of Layered Double Hydroxides and Mesoporous Silica During the Preparation of Heterostructures
Heterostructures constructed with mesoporous silica and layered double hydroxides are interesting for catalytic and drug delivery applications. Different arrangements between these phases are possible. In this study, we prepared heterostructures by embedding layered double hydroxides phases [M4Al2(OH)12](CO3) (M = Mg2+ or Zn2+) within the MCM41 mesoporous si
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. First evaluation of semidirect recycling methods for the reclamation of cemented carbides based on a literature survey
ABSTRACT At the moment the industrially applied techniques for cemented carbide reclamation feature several deficiencies. Depending on the process route, obstacles consist in high energy and chemical consumption (indirect recycling methods) or a deterioration of the recycled product in comparison with the primary material (direct recycling approach). Therefo
Matéria (Rio J.). Publicado em: 19/07/2018
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3. Síntesis y caracterización de “tanatos” de lantano como inhibidores de la corrosión
ABSTRACT Tannins are polyphenols synthesized by plants. They are found in Quebracho (Schinopsis Balansae) wood, Tara (Caesalpinia spinosa) fruits, etc. They have been incorporated in the coating industry as "antifouling" agents and as corrosion inhibitors in acidic solutions. Moreover, lanthanum solutions have a great inhibitory effect over SAE 1010 steel co
Matéria (Rio J.). Publicado em: 19/07/2018
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4. Inorganic-organic hybrids originating from organosilane anchored onto leached vermiculite
The reactivity of clay minerals leached in grafting reactions was investigated. Precursor solids were prepared by treating the sodium vermiculites with nitric acid solutions at several concentrations. The lixiviation produced the restructured porous solids with surface area over a wide range, varying from 133 to 673 m² g- 1. The sodium and lixiviated vermic
Mat. Res.. Publicado em: 21/05/2013
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5. Formas de potassio em regossolos do estado da Paraiba.
Este trabalho teve como objetivo determinar as formas de potassio em regossolos do Estado da Paraiba e correlaciona-las entre si. Os parametros analisados foram K trocavel, K nao-trocavel, K total, K extraido pelo Bray l, potencial de potassio e poder tampao de potassio (PTK). As formas de potassio mostraram-se altamente correlacionadas entre si. O potassio
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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6. Efeito de calcario e gesso nos teores de calcio e aluminio da camada compactada em latossolo vermelho-escuro.
Este trabalho foi desenvolvido no laboratorio da Universidade Federal de Uberlandia para avaliar o efeito de niveis de compactacao e de doses de gesso e de calcario nos teores de Al3+ e Ca2+ da camada compactada. Utilizaram-se colunas, formadas pela sobreposicao de tres aneis de PVC de 1 dm de diametro e 0,5 dm de altura, contendo nos extremos camadas de sol
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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7. Recuperação de urânio de rejeito de mina por meio de lixiviação alcalina / Recovery of uranium from mine wastes by alkaline leaching
Appropriate management of wastes is one of the most important environmental problems, particularly concerning the tailings of mining activities. Interim storage of the tailings at incorrect places pending treatment demands an urgent solution. The Osamu Utsumi Mine located in the city of Caldas, Minas Gerais, has faced such problem. The waste of the mine cons
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2010
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8. Síntese e avaliação de sílica tipo M41S contendo cátions CTA em transesterificação catalítica
The investments in the biofuel production have increased a lot in the last years mainly because of smaller damages they cause to the environment in comparison with the derived conventional petroleum fuels. The reaction of biodiesel formation is denominated transesterification and, nowadays that reaction happens in the presence of homogeneous catalyst as the
Publicado em: 2010
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9. O papel das lideranças comunitárias em projetos de saúde e ambiente : uma análise das redes sociais em comunidades do Rio Tapajós, Pará
Deforestation practices in Amazon region lead to the development of two health problems related to inappropriate land use. One of them is mercurial contamination, which occurs through the erosion and lixiviation of the soil, when the mercury naturally found on the ground of the region contaminates the aquatic eco-system, accumulating in the trophic chains re
Publicado em: 2009
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10. Efeito do intemperismo artificial em quatro madeiras tropicais monitorado por espectroscopia de infravermelho (DRIFT)
Four tropical woods, were investigated to compare their performance and natural resistances to artificial weathering using the diffuse reflectance infrared Fourier transform spectroscopy (DRIFT). The species were garapeira (Apuleia leiocarpa), itaúba (Mezilaurus itauba) and tauari (Couratari sp.), woods traditionally indicated for exterior uses, and marupá
Química Nova. Publicado em: 2008
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11. RESIDUALS FROM TWO HERBICIDES IMAZETHAPYR AND IMAZAPIC ON PADDY RICE WITH DIFFERENTS SOIL MANAGEMENTS / RESIDUAL DA MISTURA FORMULADA DOS HERBICIDAS IMAZETHAPYR E IMAZAPIC EM ÁREAS DE ARROZ SOB DIFERENTES MANEJOS DE SOLO
Red rice (Oryza spp.) is one of the main limiting factors of rice yield (O. sativa L.) in the world and particularly in the Rio Grande do Sul (RS) state Brazil. The Clearfield technology is a viable and efficient tool for controlling such harmful plant by using imidazolinone herbicides in tolerant cultivars. However, herbicides may persist on the soil after
Publicado em: 2008
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12. ProduÃÃo de Alface Americana Utilizando Mulching Dupla Face, sob Diferentes TensÃes de Ãgua no Solo / Crisphead lettuce production using double face mulching, under different soil water tensions, in Lavras, MG.
GEISENHOFF, Luciano Oliveira. Crisphead lettuce production using double face mulching, under different soil water tensions, in Lavras, MG. 2008. 77p. Dissertation (Master in Agricultural Engineering/Water Engineering and soil) - Universidade Federal de Lavras (UFLA), Lavras, Minas Gerais, Brazil. Lettuce is the main horticultural plant in Brazil, both in t
Publicado em: 2008