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Composite materials from PET and red mud (RM) wastes were used as catalysts for environmental application such as the wastewater treatment. The PET-RM catalysts were obtained by a mechanical mixture of the residues followed by thermal treatment under an N atmosphere (300°C/1 h). An additional activation of the composites with CO was investigated (at 800-900°C) to reduce the red mud basicity. The CO activation affected the composites surface area and reduced their carbon content. XRD revealed that the haematite (α-FeO) and maghemite/magnetite are the main iron oxides present in the composites. Mössbauer characterization indicated the formation of reduced iron species (Fe), highly reactive, after the composites heat treatment. The materials were very active catalysts for methylene blue (MB) and paracetamol (PRC) removal from aqueous solution. The catalytic activity revealed to be dependent on the surface area and mainly of the presence of reduced iron species in the catalysts. The MB removal reached 97% for both PET-RM 800/2 h and PET-RM 800/5 h, after 1 h of reaction. In the case of PRC, the highest removal was also obtained for PET-RM 800/2 h and PET-RM 800/5 h, of ≈25% and 40%, respectively. The contaminants removal mechanism likely occurred through combined adsorption and Fenton-like oxidation processes.

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RESUMO -Atualmente os processos de redução de impactos ambientais se tornam cada vez mais uma realidade acessível as atividades industriais, isso inclui as práticas de reaproveitamento de resíduos, agregando funcionalidade a materiais de descarte e as transformando em objetos de solução e/ou redução de impactos ambientais. Neste sentido este trabalho visão reaproveitamento de resíduo oriundo da casca do amendoim como alternativa na produção de carvão ativado. A partir da síntese pode observar o alta rendimento, cerca de 45%. Por fim, pode-se demonstrar o caráter promissor da casca do amendoim como material percursor na produção de carvão ativado tanto pelas suas características químicas, quanto por seu custo e disponibilidade.