Uso de fonte renovável para o desenvolvimento de nanocompósitos argila aniônica/carvão hidrotérmico e sua aplicação como adsorventes multifuncionais

Detalhes bibliográficos
Ano de defesa: 2017
Autor(a) principal: Albano, Roberta Laiz Bezerra Santos
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://www.repositorio.ufc.br/handle/riufc/71282
Resumo: This works attempts to develop multifunctional materials – nanocomposites –, involving anionic-clays and hydrochar. It was synthesized using hydrothermal carbonization (HTC) of cellulose in the presence of the clay, aiming to use it as an adsorbent for cationic and anionic chemical substances. HTC is promising in the aspect of adding value to waste (biomass/biomolecules), with biomass being a renewable raw material source and abundant for the sustainable production of carbonaceous materials. Two nanocomposite systems were prepared: i) anionic clay made of Mg, Al, sulfate and hydrochar and ii) anionic clay made of Mg, Al, carbonate and hydrochar. For each system, two temperatures (230 and 250 ºC) and two reaction times (4 and 24h) were used. These materials were characterized for its compositional, thermal, structural, textural and morphological properties. Previous adsorption tests using anionic (Reactive blue 19) and cationic (Methylene blue) dyes were performed with the prepared systems. These results indicated that nanocomposite HDLSO4 (230oC e 4h) presented the most promising results regarding the interaction with the anionic and cationic dyes. Therefore, this sample was chosen for additional adsorption experiments. The kinetic curves showed equilibrium time of 480 min for both dyes. The isotherms showed that the maximum capacity of dye removal was, approximately, 121,4 mg/g of Reactive blue 19 and 24,3 mg/g of methylene blue. Thus, the anionic clay/hydrochar nanocomposite presents multifunctionality through adsorption of positively and negatively charged chemical species. The nanocomposite could be applied as a new adsorbent in environmental remediation.