Carbons
Mostrando 1-12 de 358 artigos, teses e dissertações.
-
1. Volatile Metabolomics from Cashew Leaves: Assessment of Resistance Biomarkers Associated with Black Mold (Pilgeriella anacardii Arx & Müller)
Black mold, a disease caused by the fungus Pilgeriella anacardii Arx & Müller, affects cashews (Anacardium occidentale). Some cashew clones are more resistant to the pathogen; however, little is known about the chemical profile responsible for this trait. The investigation of volatile organic compounds (VOCs) from leaves of dwarf cashew clones resistant (BR
Journal of the Brazilian Chemical Society. Publicado em: 2022
-
2. CHLORDECONE ADSORPTION ON FUNCTIONALIZED ACTIVATED CARBONS: COMPUTATIONAL CHEMISTRY AS A TOOL FOR UNDERSTANDING THE ADSORPTION PROCESS
Chlordecone (CLD) has been used as a pesticide for a long time to control the proliferation of various insects in tropical countries like the French West Indies. CLD was included in 2009 in the list of persistent organic pollutants (POPs) by the Stockholm Convention, prohibiting its production and use worldwide. Thus, its removal from water and soils is a sa
Quím. Nova. Publicado em: 2021-02
-
3. SYNTHESIS, CHARACTERIZATION, ADSORPTION AND THERMODYNAMIC STUDIES OF PURE AND BINARY CO2-N2 MIXTURES ON OXYGEN ENRICHED NANOSTRUCTURED CARBON ADSORBENTS
Abstract Oxygen enriched porous carbons have been synthesized by a nanocasting technique using mesoporous zeolite as template and epoxy resin as precursor. Characterization results show the effect of the nanocasting technique on the development of heterogeneous surface, high basicity, and high surface area of 686.37 m2g-1, beneficial for CO2 adsorption. Pure
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
-
4. Estudo da capacidade de adsorção de carvões ativados comerciais versus tempo de armazenamento
Resumo O carvão ativado pulverizado quando bem embalado e estocado não possui um prazo de validade regulamentado. Em geral, esta validade é determinada de acordo com requisitos estabelecidos pelo próprio fabricante e está diretamente relacionada a uma estimativa de tempo superior ao tempo em que o produto ficará estocado no cliente até a sua utilizaç
Ciênc. Florest.. Publicado em: 02/12/2019
-
5. PREPARATION AND CHARACTERIZATION OF CARBON FROM THE FRUIT OF BRAZIL NUT TREE ACTIVATED BY PHYSICAL PROCESS
RESUMO Carvão ativado é o nome de um grande grupo de materiais que apresentam alto grau de porosidade e, consequentemente, extensa área superficial interna, com propriedades adsortivas de caráter físico e químico. Inúmeros materiais podem ser utilizados como precursores, especialmente biomassa. O objetivo deste trabalho foi obter carvão ativado a par
Rev. Árvore. Publicado em: 14/11/2019
-
6. Modification of Chitosan by Zincke Reaction: Synthesis of a Novel Polycationic Chitosan-Pyridinium Derivative
Chitosan is a biodegradable aminopolysaccharide produced by deacetylation of acetamide groups of chitin, one of the most abundant organic materials in nature. Many different types of organic reactions have been described to modify the functional groups of chitosan and produce materials with applications in a large number of areas. However, the Zincke reactio
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
-
7. Activated carbon from bamboo (Bambusa vulgaris) waste using CO2 as activating agent for adsorption of methylene blue and phenol
Resumo Resíduos de bambu (Bambusa vulgaris) foram utilizados como matéria-prima para a produção de carvão ativado (CA). Os materiais foram coletados e transformados em CA mediante processos de carbonização (500°C, 1,67°C min-1, 60 min) e ativação (800°C, 10°C min-1, 60 min) com CO2 (100 mL min-1). O material obtido (CA CO2) foi caracterizado pel
Ciênc. Florest.. Publicado em: 30/09/2019
-
8. Three Different Types of Activated Carbon and Manganese-Modified Activated Carbons as Deoxidizers for the Low-Concentration Coalbed Methane Deoxidation
Different activated carbons and manganese-modified activated carbons were prepared as deoxidizers for the low-concentration coalbed methane deoxidation. The results show that the deoxidation performance of the different activated carbons is affected by raw materials for preparation of deoxidizers. One type of activated carbon exhibited the best performance o
J. Braz. Chem. Soc.. Publicado em: 16/09/2019
-
9. OTIMIZAÇÃO DAS CONDIÇÕES FERMENTATIVAS DE PICHIA MEMBRANIFACIENS PARA PRODUÇÃO DE ETANOL DE SEGUNDA GERAÇÃO
Technologies developed in the last decade have made viable the use of lignocellulosic materials for the production of ethanol. However, to improve the fermentative yield some improvements are necessary, among them the search for new microorganisms capable of fermenting sugars with five carbons. Thus, the present research aimed to determine the best pH and te
Quím. Nova. Publicado em: 26/08/2019
-
10. 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
-
11. Thermal radical polymerization of Bis(methacrylamide)s
Abstract Methacrylamides monomers for dental applications were synthesized using a one-step procedure starting from methacrylic anhydride and the respective diamine: N,N’-(propane-1,3-diyl)-bis(N-ethyl-2-methylacrylamide) (1), N,N’-(butane-1,4-diyl)-bis(2-methacrylamide) (2), N,N’-(octane-1,8-diyl-)bis(2-methylacrylamide) (3) and N,N’-(1,4-phenylene)
Polímeros. Publicado em: 27/06/2019
-
12. Seleção de carvões ativados para adsorção de microcistinas
RESUMO A presença das cianobactérias é uma das grandes preocupações para o tratamento de água, uma vez que esses microrganismos podem ser produtores de metabólitos tóxicos, como as microcistinas (MCs), que não são efetivamente removidas no tratamento usualmente empregado de ciclo completo. Para a remoção dessas toxinas, pode-se, de forma compleme
Eng. Sanit. Ambient.. Publicado em: 30/05/2019