期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 306, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.114490
关键词
Activated carbon; Biosorbent; Phenolic acid; Wastewater treatment; Adsorption; Olive mill wastewater
资金
- Laboratory for Process Engineering, Environment, Biotechnology and Energy -LEPABE - FCT/MCTES (PIDDAC) [UIDB/00511/2020]
- European Regional Development Funds (ERDF) through North Portugal Regional Operational Programme (NORTE 2020) [NORTE-01-0247-FEDER-39789]
- Project HealthyWaters -Identification, Elimination, Social Awareness and Education of Water Chemical and Biological Micropollutants with Health and Environmental Implications - NORTE 2020, under the PORTUGAL 2020 Partnership Agreement [NORTE-01-0145-FEDER-000069]
- MCIN/AEI/FEDER Una manera de hacer Europa [RTI2018-099224-B-I00]
- FCT [SFRH/BD/129235/2017]
- National Fund through the Human Capital Operational Programme (POCH)
- European Social Fund through the Human Capital Operational Programme (POCH)
- MCIN/AEI [RYC-2019-026634I]
- European Social Found (FSE) El FSE invierte en tu futuro [RYC-2019-026634I]
- Universidad de Granada/CBUA
Several adsorbents were developed from olive stones and wood from olive tree pruning by physical and chemical activation. These adsorbents exhibited promising adsorptive performance for the removal of phenolic compounds from olive mill wastewater. The results of this study provide insights into the adsorption mechanisms and regeneration of the adsorbents.
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.
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