Sodium Hydroxide
Mostrando 13-24 de 214 artigos, teses e dissertações.
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13. Alkaline activation of high-calcium ash and iron ore tailings and their recycling potential in building materials
Resumo Materiais álcali ativados são aglomerantes obtidos a partir da ativação alcalina de precursores ricos em alumínio e silício. Os precursores mais comuns utilizados para ativação são as cinzas com baixo teor de cálcio, as escórias de alto forno e o metacaulim. Contudo, a cinza de cavaco de eucalipto (CCE) e o rejeito de minério de ferro (RMF
Ambient. constr.. Publicado em: 10/06/2019
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14. Cenizas de cascarilla de arroz para la activación alcalina de cementantes binarios (ceniza volante/escoria de alto horno)
ABSTRACT Alkali activated mortars made of class F fly ash and blast furnace slag were cast, in order to study the effect of an alternative source of silica on its properties of fluidity and compressive strength. Rice husk ash and sodium silicate solution, mixed with sodium hydroxide, were used for activation of mortars. The mineralogical and structural infor
Matéria (Rio J.). Publicado em: 20/05/2019
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15. Use of FTIR-ATR Spectroscopy Combined with Multivariate Analysis as a Screening Tool to Identify Adulterants in Raw Milk
The objective of this study was to use Fourier transform infrared (FTIR) spectroscopy combined with multivariate analysis to identify adulterations in raw milk and in samples from producers. Five levels of concentration of sodium bicarbonate, sodium hydroxide, hydrogen peroxide, starch, sucrose and urea were used. A total of 620 samples previously adulterate
J. Braz. Chem. Soc.. Publicado em: 2019-04
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16. Extraction and characterization of cellulose microfibers from Retama raetam stems
Abstract Cellulose is the most abundant renewable resource in nature, it has various industrial applications due to its promising properties. Retama raetam is a wild plant belonging to the Fabaceae family, largely abundant in arid area which makes it a good candidate for industrial utilization. In the present study, highly crystalline cellulose microfibers
Polímeros. Publicado em: 18/03/2019
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17. Biossorção de íons Cr(III) de soluções aquosas sintéticas e efluente de curtume utilizando a macrófita aquática Pistia stratiotes
RESUMO O cromo é um metal tóxico amplamente utilizado em processos industriais, por isso a constante preocupação com os efluentes líquidos gerados. Uma vez lançados sem o devido tratamento podem comprometer a qualidade do corpo receptor. Este trabalho teve por objetivo analisar o processo de biossorção na remoção de íons Cr(III) de soluções aquo
Eng. Sanit. Ambient.. Publicado em: 21/02/2019
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18. Development and characterization of sustainable lightweight geopolymer composites
Resumo A produção de materiais de construção leves atrai a atenção dos cientistas em todo o mundo com a necessidade de reduzir o peso morto das estruturas, fornecer melhor isolamento térmico para edifícios e ter menor custo de transporte. O presente trabalho centrou na produção de compósitos geopoliméricos leves pela incorporação de pó de alum
Cerâmica. Publicado em: 2019-01
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19. Reversibility of the Hardening Process of Plinthite and Petroplinthite in Soils of the Araguaia River Floodplain under Different Treatments
ABSTRACT Although ferruginous materials occur frequently in soils of tropical regions, information about the reversal of the hardening process of these materials is scarce. This study assessed the influence of different chemical treatments and periods of immersion on the reversibility of the hardening process of plinthite and petroplinthite in soils of the A
Rev. Bras. Ciênc. Solo. Publicado em: 02/07/2018
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20. USO DE PALHA DE AÇO COMERCIAL PARA O TRATAMENTO DE EFLUENTES CONTENDO CROMO HEXAVALENTE PROVENIENTES DE PROCESSOS DE ELETROCOLORAÇÃO DE AÇOS INOXIDÁVEIS
Residual solutions containing Cr(VI) ions can be harmful to the environment as well as to human health. Hence, practical and efficient methods for the treatment of such solutions are welcome. In this note, the treatment with commercial steel wool pads of a Cr(VI) residual solution from electrochemical coloration processes of stainless steel is described in d
Quím. Nova. Publicado em: 2018-03
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21. Natural decomposition of hornbeam wood decayed by the white rot fungus Trametes versicolor
ABSTRACT The impacts of white-rot fungi on altering wood chemistry have been studied mostly in vitro. However, in vivo approaches may enable better assessment of the nature of interactions between saprotrophic fungi and host tree in nature. Hence, decayed and sound wood samples were collected from a naturally infected tree (Carpinus betulus L.). Fruiting bod
An. Acad. Bras. Ciênc.. Publicado em: 07/12/2017
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22. On The Mechanical Behavior of Metakaolin Based Geopolymers Under Elevated Temperatures
Geopolymers may be described as solid and stable synthesized aluminosilicate materials, whose properties are generally believed to provide a superior durability behavior. The work in hand presents the results of an experimental investigation on the thermomechanical behavior of geopolymer matrices composed by metakaolin (MK), silica fume (SF) and blast furnac
Mat. Res.. Publicado em: 13/07/2017
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23. Intercalation of Molybdate Ions into Ni/Zn Layered Double Hydroxide Salts: Synthesis, Characterization, and Preliminary Catalytic Activity in Methyl Transesterification of Soybean Oil
This study reports the synthesis and characterization of a Ni/Zn layered double hydroxide salt intercalated with acetate ions and the subsequent replacement of the acetate ions with molybdate ions via an ion exchange reaction, conducted at two different pH values. Regardless of the pH employed during the synthesis, the basal spacing in the Ni/Zn layered doub
J. Braz. Chem. Soc.. Publicado em: 2017-07
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24. Temperature influence in cornstarch gelatinization for froth flotation
Abstract Starches are widely used as depressant in froth flotation operations in Brazil due to their efficiency, increasing the selectivity in the inverse flotation of quartz, depressing iron ore. The starch market has been growing and improving in recent years, leading to better products attending the requirements of the mineral industry. The major source o
REM, Int. Eng. J.. Publicado em: 2017-06