Carbon nanotube-coated Al₂O₃ materials for removing N-nitrosamines, 2-methylisoborneol and geosmin from water

Autor(es)

Salussoglia, Ana Isabela Pianowski ; Silva, Gabriel Matias ; Soares, Gustavo Guerreiro Candido ; de Lima, Maria Eduarda ; Rosolen, Jose Mauricio ; de Moraes, Luiz Alberto Beraldo

• Tipo de documento: Artigo Científico
• Fonte: FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES; v. 32, n. 5, p. 12-pg., 2023-11-30.

Resumo

Concern over safe drinking water has increased. In this study, aluminum oxide was coated with carbon nanotubes by chemical vapor deposition using ethanol or methanol as precursors to remove N-nitrosamines, 2-methylisoborneol (MIB) and geosmin from water. Seven types of N-nitrosamines were investigated. The differences in the surface of the carbon nanotubes were attributed to the carbon precursors ethanol and methanol. Despite the high concentration of analytes, the adsorption capacity of both carbon nanotubes (CNTs) was around 19 mg/mg for MIB and geosmin. Against approximately 0.9 ng/mg for activated carbon. For N-nitrosamines, the adsorption capacity of CNTs reached 50 ng/mg for NDBA, N-nitrosamines with the highest molecular weight, while activated carbon had values below 6.0 ng/mg. The results showed pi-pi interactions play a dominant role in the adsorption of MIB and geosmin under the investigated conditions. On the other hand, for N-nitrosamines, both dipole-dipole and pi-pi interactions come into play, with the latter becoming more prominent as the molecular weight of N-nitrosamines increases. The removal efficiencies of CNT-coated aluminum oxide reached 84,0%. The analytes with longer carbon chains were removed more efficiently and CNT-coated aluminum oxide grown from ethanol or methanol had no statistical difference between the removal efficiencies of all evaluated analytes. (AU)

• Processo FAPESP: 20/12204-3 - Desenvolvimento de elementos filtrantes micro/nanoestruturados de carbono e aferidos por métodos cromatográficos e espectrometria de massas para produção de agua potável
• Beneficiário: Jose Mauricio Rosolen
• Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE