Specific adsorbents for the treatment of OMW phenolic compounds by activation of bio-residues from the olive oil industry

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Esteves, BM (Autor) FEUP; Morales Torres, S (Autor) Outra; Luis Madeira (Autor) FEUP; Maldonado Hodar, FJ (Autor) Outra

Revista

Título: Journal of Environmental Management

Vol. 306

ISSN: 0301-4797

Editora: Elsevier

Indexação

ISI Web of Knowledge - 2 Citações

Scopus - 3 Citações

Projetos Associados

Healthy Waters - Healthy Waters - Identification, Elimination, Social Awareness and Education of Water Chemical and Biological Micropollutants with Health and Environmental Implications

Outras Informações

ID Authenticus: P-00W-05Q

DOI: 10.1016/j.jenvman.2022.114490

Abstract (EN): A series of adsorbents was developed by physical (CO2) and chemical (KOH) activation of two bio-residues: olive stones (OS) and wood from olive tree pruning (OTP). The physicochemical properties of such materials were determined and correlated with their adsorptive performance in the removal of phenolic compounds of olive mill wastewater (OMW). Adsorption isotherms and kinetics of single phenolic acids, as well as the kinetics for competitive multi-compound adsorption, were fitted by applying different models, though Langmuir and pseudosecond order models fitted better the experimental results, respectively. The intraparticle diffusion model pointed out that mesoporosity reduces the influence of phenolic compounds' restrictions in the external film diffusion of the adsorbent particle-solution interphase, but adsorption capacity linearly increases with the micropore volume accessible to N-2 at -196 degrees C (and also with BET surface area), while diffusion into ultramicropores (<0.7 nm, determined by CO2-adsorption) is slow and presents minor influence on the total adsorption capacity. After saturation, thermal regeneration of spent adsorbents allows the removal of adsorbed products, enabling the reuse of samples whilst maintaining a significant performance.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15