Magnetic activated carbonaceous materials from sugarcane bagasse: Preparation, characterization, and hexavalent chromium removal

Autor(es)

Nogueira, Gabriela A. ; Fregolente, Lais G. ; Pereira, Lorena S. ; Laranja, Marcio J. ; Moreira, Altair B. ; Ferreira, Odair P. ; Bisinoti, Marcia C.

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS TODAY SUSTAINABILITY; v. 28, p. 12-pg., 2024-12-01.

Resumo

The presence of hexavalent chromium (Cr (VI)) in effluents remains a global concern due to its toxic properties. Even though adsorption has been employed for its removal from water, developing sustainable materials with higher adsorption capacities is still pivotal to tackling such contamination. In this study, two magnetic carbons (MC) were produced by hydrothermal carbonization (HTC) of sugarcane bagasse in the presence of iron (III) nitrate at 230 and 270 degrees C. Both MCs were thermochemically activated at 500 and 700 degrees C using KOH (1:2; w:w). The materials were characterized in terms of composition, structure, morphology, texture, and surface properties and then evaluated in adsorption studies of Cr (VI). After HTC, some iron phases such as alpha-Fe2O3, gamma-Fe2O3, and Fe3O4 were observed, while thermochemical activation additionally revealed Fe0 and Fe4[Fe(CN)6]3. Activation increased the amount of meso- and macropores, specific surface area, pHzpc, surface hydrophilicity, and carbon and nitrogen contents. The adsorption kinetics study indicated that the pseudo-second-order model describes better the behavior of the materials. The investigation of adsorbent dose showed that doses below 1.00 g L- 1 were more efficient in Cr (VI) removal. MC-230 and MC-270 thermochemically activated at 700 degrees C exhibited the highest Cr (VI) adsorption capacities (10.5 and 15.5 mg g- 1, respectively). Therefore, the improved adsorption capacity for Cr (VI) of the materials thermochemically activated at 700 degrees C was mainly due to their enhanced textural properties. (AU)

• Processo FAPESP: 21/12214-1 - Propriedades e aplicação de matéria orgânica extraída de carvão hidrotérmico e água de processo da carbonização hidrotérmica de bagaço de cana-de-açúcar e vinhaça
• Beneficiário: Altair Benedito Moreira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/02471-4 - Valorização de óleo fúsel da cana-de-açúcar via processos catalíticos de desidrogenação parcial
• Beneficiário: Mauricio Boscolo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 21/08839-6 - Produção de carvão magnético ativado com KOH para remoção das espécies de cromo
• Beneficiário: Gabriela Aparecida Nogueira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 21/09126-3 - Ativação de carvão magnético para adsorção de compostos orgânicos e inorgânicos
• Beneficiário: Márcia Cristina Bisinoti
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular