Sulfuric Acid
Mostrando 13-24 de 209 artigos, teses e dissertações.
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13. Structure and Properties of Dual-doped PEDOT:PSS Multilayer Films
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is the most successful transparent conductive polymer widely used in functional organic devices. However, its potential in fabrication of highly conductive electrodes still has not been fully explored. This paper is an attempt to fill the existing gap of knowledge on possible post-treatments
Mat. Res.. Publicado em: 09/12/2019
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14. Modeling and prediction of sulfuric acid digestion analyses data from PXRF spectrometry in tropical soils
ABSTRACT Sulfuric acid digestion analyses (SAD) provide useful information to environmental studies, in terms of the geochemical balance of nutrients, parent material uniformity, nutrient reserves for perennial crops, and mineralogical composition of the soil clay fraction. Yet, these analyses are costly, time consuming, and generate chemical waste. This wor
Sci. agric. (Piracicaba, Braz.). Publicado em: 04/11/2019
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15. Melanin bleaching with potassium permanganate for melanocytic lesions diagnosis in veterinary medicine
RESUMO Este estudo objetivou reavaliar microscopicamente os diagnósticos de lesões melanocíticas estabelecidos pelo setor de Patologia Animal da Universidade Federal de Uberlândia, em um período de 11 anos, e, com base nesse levantamento, realizar uma análise comparativa entre o método histopatológico convencional (HC) e o método de despigmentação
Arq. Bras. Med. Vet. Zootec.. Publicado em: 28/10/2019
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16. Evaluation of the Acid Baking Technique to Decrease the Phosphorus Content of the Iron Ore
Unlike the available mineral resources, the steelmaking processes have demanded raw material with lower phosphorus content to decrease the costs, energy use, and the residue generated within the steel plant. One alternative is to develop pretreatment of the iron ore concentrates producing raw materials with lower phosphorus. Depending on the mineral structur
Mat. Res.. Publicado em: 23/09/2019
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17. Sulfonated Styrene-Acrylic Acid Copolymers with pH-Indicator Property
In this study, a polymer pH-indicator was synthesized by sulfonation of poly(styrene-co-acrylic acid) with concentrated sulfuric acid. The synthesized polymer pH-indicator exhibited pH-responsive color changes in aqueous solutions, being purple in alkaline medium (pH < 4), whereas yellow in acidic medium (pH > 9). The sulfonation process extent and polymer c
J. Braz. Chem. Soc.. Publicado em: 16/09/2019
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18. Overcoming dormancy of Senna multijuga seeds with an ultrasonic probe the comparison with ultrasound and sulfuric acid baths
RESUMO: Entender a germinação é extremamente importante para produção de mudas utilizadas na revegetação de áreas degradadas. Algumas espécies são consideradas dormentes por apresentarem uma estratégia de sobrevivência para superar condições ambientais adversas. Essas sementes germinam apenas quando esse processo é interrompido, o que pode oc
Cienc. Rural. Publicado em: 09/09/2019
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19. PEDOGENESIS ON COASTAL TABLELANDS AREA WITH LOW RANGE ALTIMETRY IN PARAÍBA STATE
RESUMO Pequenas variações de relevo influenciam na drenagem e no escoamento superficial, contribuindo para a formação de horizontes superficiais arenosos e subsuperficiais endurecidos (fragipãs e, ou, duripãs) em solos dos Tabuleiros Costeiros. Este trabalho investigou a pedogênese em área de Tabuleiros Costeiros com baixa amplitude altimétrica no E
Rev. Caatinga. Publicado em: 18/07/2019
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20. THE ROLE OF SULFONATED ACTIVATED CARBONS AS CATALYSTS FOR THE HYDROLYSIS OF CELLOBIOSE
ABSTRACT In this work the production of glucose via hydrolysis of cellobiose using sulfonated active carbons as catalysts was studied. Commercial carbons presenting different types of porous system (micropores and mesopores) have been treated with sulfuric acid at different temperatures, being characterized afterwards. Such carbons have been tested as cataly
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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21. DILUTE ACID HYDROLYSIS OF SWEET SORGHUM BAGASSE AND FERMENTABILITY OF THE HEMICELLULOSIC HYDROLYSATE
ABSTRACT This study aimed to determine the best dilute acid hydrolysis condition for the hemicellulosic fraction of sweet sorghum bagasse for ethanol production by Scheffersomyces stipitis. The experiment followed a 23 factorial design with four central points, and had as variables: sulfuric acid concentration, temperature and hydrolysis time. Sorghum bagass
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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22. COMPETING SOLVENT EXTRACTION OF CALCIUM AND/OR NICKEL WITH CYANEX 272 AND/OR D2EHPA
ABSTRACT The present study assessed the competing behavior between metals and extractants applied to the solvent extraction of calcium and/or nickel present in sulfuric solutions using the extractants Cyanex 272 (bis-2,4,4-trimethylpentyl phosphinic acid) and/or D2EHPA (di-2-ethylhexyl phosphoric acid). Tests were designed to allow equivalent competing condi
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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23. Pyrite utilization in the carboniferous region of Santa Catarina, Brazil - Potentials, challenges, and environmental advantages
Abstract The main coal seams explored in the coal region of Santa Catarina are Barro Branco (BB) and Bonito (BO). Owing to the association with the mineral matter, the tailings generated in the beneficiation are arranged in disposal areas, and subject to the generation of acid mine drainage (AMD). The objective of this study was to evaluate the use of pyrite
REM, Int. Eng. J.. Publicado em: 19/06/2019
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24. Dormancy overcoming and germination test in Piptadenia stipulacea (Benth.) Ducke seeds
RESUMO Piptadenia stipulacea (Benth.) Ducke apresenta germinação lenta e desuniforme, devido à dormência tegumentar, além disto, não há indicações padronizadas quanto à temperatura e substrato para condução do teste de germinação em laboratório. Objetivou-se avaliar métodos de superação de dormência, temperaturas e substratos na germinaç�
Rev. Ciênc. Agron.. Publicado em: 2019-06