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

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Esteves, BM (Author) FEUP; Morales Torres, S (Author) Other; Luis Madeira (Author) FEUP; Maldonado Hodar, FJ (Author) Other

Journal

Title: Journal of Environmental Management

Vol. 306

ISSN: 0301-4797

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 3 Citations

Associated Projects

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

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15