9 documents found, page 1 of 1
Activated carbon from bamboo (Bambusa vulgaris) waste using CO2 as activating a...
Santana,Gregório Mateus; Trugilho,Paulo Fernando; Borges,Willian Miguel da Silva; Bianchi,Maria Lucia; Paes,Juarez Benigno; Nobre,João Rodrigo CoimbraAbstract Bamboo (Bambusa vulgaris) wastes were used as raw material for producing activated carbon. The materials were collected and turned into activated carbons by carbonization (500 °C, 1.67 °C.min-1, 60 min) and activation (800 °C, 10 °C.min-1, 60 min) processes with CO2 (100 mL.min-1). The obtained material (CO2 AC) was characterized by its yield, elemental analysis, ash content, surface area (SBET), Boehm...
Elementary, Chemical and Energy Characteristics of Brazil Nuts Waste (Bertholle...
Leandro,Renata Ingrid Machado; Abreu,Jesomi Jonatan da Costa; Martins,Cleibiane da Silva; Santos,Iêdo Souza; Bianchi,Maria LuciaABSTRACT This study aimed to determine the chemical and energetic composition of Brazil nut waste in the city of Castanhal-PA. Some of the material was crushed, sifted and stored for acclimatization and analysis. Molecular and immediate chemical analyses were performed on the raw material according to NBR standards. Another part was charred in Muffle furnace, with heating rate of 1.67 °C.min-1 and temperature o...
Elementary, Chemical and Energy Characterization of “Dendê” (Elaeis guineensis ...
Abreu,Jesomi Jonatan da Costa; Martins,Cleibiane da Silva; Pereira,Paulo Cezar Gomes; Bianchi,Maria Lucia; Nobre,João Rodrigo CoimbraABSTRACT This work aimed to chemically and energetically characterize palm waste in the municipality of Igarapé Açú-PA. The residue was crushed, sieved and acclimated up to 12% of humidity. Chemical analyses were performed in the fresh material, according to NBR standards. Part of the residue was transformed into charcoal at 450 °C, with heating rate of 1.67 °C.min-1 and residence time of 30 minutes. Elementary...
Enhancing the sugars production yieldby supporting H3PW12O40 heteropoly acid on...
Carminati,Saulo do Amaral; Arantes,Ana Carolina Cunha; de Oliveira,Anna Cláudia Santos; Bianchi,Maria LuciaABSTRACT In this work, two catalysts were produced to be used in hydrolysis of cellulose reactions to obtain glucose, a raw material used in the production of bioethanol. The heteropoly acid, H3PW12O40 (HPW), reported as strong and thermally stable acid, was supported on activated carbon (AC) in a ratio varying from 1:1 to 2:1 to produce the catalysts AC-HPW (1:1) and AC-HPW (2:1). The catalysts were tested in ...
Hydrolysis of cellulose using heteropoly salts derivatives from H3PW12O40 with ...
Arantes,Ana Carolina Cunha; Oliveira,Anna Cláudia Santos de; Borges,Willian Miguel da Silva; Bianchi,Maria Lucia; Resende,Eliane Cristina deABSTRACT Heteropoly salts containing different numbers of vanadium atoms (K4[PVW11O40] - KPWV1 and K6[PV3W9O40] - KPWV3) were synthesized from the heteropoly acid H3PW12O40 (HPW), and used as catalysts in hydrolysis of cellulose reactions in order to change the redox properties and verify whether the cluster of catalysts are involved in mechanism reaction. The hydrolysis reactions following a full 23 factorial ...
Produção, caracterização e avaliação da capacidade adsortiva de carvões ativado...
Borges,Willian Miguel da Silva; Arantes,Ana Carolina Cunha; Castro,Guilherme Mello Mattos de; Bianchi,Maria Lucia; Nobre,João Rodrigo CoimbraRESUMO Carvões ativados em forma de briquetes foram preparados a partir do resíduo da madeira de candeia, gerado no processo de extração do óleo α-bisabolol. O material foi briquetado, carbonizado e ativado com CO2,variando-se a temperatura (700-900°C) e o tempo de ativação (1-3 horas). Para a caracterização dos carvões ativados foram realizadas análise elementar (CHN-O), análise dos grupos funcionais (titulaçã...
Preparação e caracterização de carvão ativado produzido a partir de resíduos do...
Brum,Sarah Silva; Bianchi,Maria Lucia; Silva,Vanésia Liane da; Gonçalves,Maraísa; Guerreiro,Mário César; Oliveira,Luiz Carlos Alves deCoffee fruit processing is one of the most polluting activities in agriculture due to the large amount of waste generated in the process. In this work, coffee parchment was employed as precursor for the production of carbons activated with ZnCl2 (CAP). The material was characterized using N2 adsorption/desorption at 77 K, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The...
CLONES DE Eucalyptus VERSUS A PRODUÇÃO DE POLPA CELULÓSICA
Trugilho,Paulo Fernando; Bianchi,Maria Lucia; Gomide,José Lívio; Lima,José Tarcísio; Mendes,Lourival Marin; Mori,Fábio AkiraRESUMO A qualidade da madeira é definida pelas combinações entre as diversas características intrínsecas da árvore em função do seu uso. O objetivo do presente estudo foi avaliar essas características na madeira de clones de Eucalyptus visando à produção de polpa celulósica kraft de qualidade. Foram usados 15 clones, duas árvores de cada clone, num total de trinta árvores, todos com idades de 5,8 anos. As carac...
Classificação de clones de Eucalyptus sp visando à produção de polpa celulósica
Trugilho,Paulo Fernando; Bianchi,Maria Lucia; Gomide,José Lívio; Schuchardt,UlfEste trabalho objetivou classificar e selecionar clones de Eucalyptus sp, tendo em vista a qualidade das polpas kraft obtidas a partir de cada material. Os clones foram classificados quanto a rendimento depurado, viscosidade da polpa e álcali ativo usado no processo de polpação. A classificação dos clones foi realizada por meio da análise de agrupamento, utilizando-se o método de otimização de Tocher. A análise...