| Titre : | Contribution to the valorization of a locally sourced plant-based biomaterial | | Titre original : | Contribution à la valorisation d’un biomatériau local d’origine végétale | | Type de document : | document multimédia | | Auteurs : | Kelthoum Saadallah, Auteur ; Chifaa Ad, Directeur de thèse ; Mebrouk Djedid, Directeur de thèse | | Editeur : | Laghouat : Université Amar Telidji - Département de génie des procédés | | Année de publication : | 2025 | | Importance : | 223 p. | | Accompagnement : | 1 disque optique numérique (CD-ROM) | | Note générale : | Option : Environmental process engineering | | Langues : | Anglais | | Mots-clés : | Adsorption Pine tree bark (PTB) multi-walled carbon nanotubes (MWCNTs) modified adsorbents (MWCNTs-PTB composites) batch system, methylene blue (MB) crystal violet (CV) | | Résumé : | This study investigates raw pine tree bark (PTB) and its composites formed by incorporating multi-walled carbon nanotubes (MWCNTs) into the PTB matrix as efficient adsorbents for the removal of methylene blue (MB) and crystal violet (CV) from aqueous solutions. Detailed characterization using FTIR, SEM, BET, XRD, TG/DSC, and zeta potential analyses demonstrated significant enhancement in the physicochemical properties of the composites, with the 1% MWCNT loading identified as optimal. The specific surface area increased from 1.46 m²/g for raw PTB to 27.56 m²/g for the 1% MWCNT composite, a significant enhancement of approximately 18.8 times. Zeta potential measurements revealed a substantial increase in surface charge stability, with raw PTB showing –22 mV and the 1% MWCNT composite displaying –39.4 mV. These modifications improved surface area, porosity, and charge stability, which directly enhanced dye adsorption capacity. Under identical experimental conditions, raw PTB exhibited adsorption capacities of 37.15 mg/g for MB and 63.69 mg/g for CV, whereas the 1% MWCNT composite achieved markedly superior capacities of 98.04 mg/g for MB and 238.09 mg/g for CV. Adsorption kinetics followed a pseudo-second-order model, and equilibrium data were well described by both Langmuir and Freundlich isotherms, revealing a complex adsorption mechanism involving monolayer and multilayer coverage on heterogeneous surfaces. Thermodynamic assessments indicated that adsorption was spontaneous, with enthalpy changes reflecting structural differences in the adsorbents and their energetics.
Both Le résumé doit être rédigé en deux langues différentes au moins materials demonstrated excellent regeneration ability over multiple cycles, maintaining substantial adsorption efficiency. Economic evaluation revealed the low cost-effectiveness of raw PTB, with an operational cost of 0.55 USD/m³, compared to 4.45 USD/m³ for the MWCNT-PTB composites. These results underscore the promise of both raw and MWCNT-modified PTB as sustainable, efficient, and scalable solutions for industrial wastewater treatment, offering a balance between performance and cost-effectiveness. | | note de thèses : | Thèse de doctorat en génie de procédés |
Contribution to the valorization of a locally sourced plant-based biomaterial = Contribution à la valorisation d’un biomatériau local d’origine végétale [document multimédia] / Kelthoum Saadallah, Auteur ; Chifaa Ad, Directeur de thèse ; Mebrouk Djedid, Directeur de thèse . - Laghouat : Université Amar Telidji - Département de génie des procédés, 2025 . - 223 p. + 1 disque optique numérique (CD-ROM). Option : Environmental process engineering Langues : Anglais | Mots-clés : | Adsorption Pine tree bark (PTB) multi-walled carbon nanotubes (MWCNTs) modified adsorbents (MWCNTs-PTB composites) batch system, methylene blue (MB) crystal violet (CV) | | Résumé : | This study investigates raw pine tree bark (PTB) and its composites formed by incorporating multi-walled carbon nanotubes (MWCNTs) into the PTB matrix as efficient adsorbents for the removal of methylene blue (MB) and crystal violet (CV) from aqueous solutions. Detailed characterization using FTIR, SEM, BET, XRD, TG/DSC, and zeta potential analyses demonstrated significant enhancement in the physicochemical properties of the composites, with the 1% MWCNT loading identified as optimal. The specific surface area increased from 1.46 m²/g for raw PTB to 27.56 m²/g for the 1% MWCNT composite, a significant enhancement of approximately 18.8 times. Zeta potential measurements revealed a substantial increase in surface charge stability, with raw PTB showing –22 mV and the 1% MWCNT composite displaying –39.4 mV. These modifications improved surface area, porosity, and charge stability, which directly enhanced dye adsorption capacity. Under identical experimental conditions, raw PTB exhibited adsorption capacities of 37.15 mg/g for MB and 63.69 mg/g for CV, whereas the 1% MWCNT composite achieved markedly superior capacities of 98.04 mg/g for MB and 238.09 mg/g for CV. Adsorption kinetics followed a pseudo-second-order model, and equilibrium data were well described by both Langmuir and Freundlich isotherms, revealing a complex adsorption mechanism involving monolayer and multilayer coverage on heterogeneous surfaces. Thermodynamic assessments indicated that adsorption was spontaneous, with enthalpy changes reflecting structural differences in the adsorbents and their energetics.
Both Le résumé doit être rédigé en deux langues différentes au moins materials demonstrated excellent regeneration ability over multiple cycles, maintaining substantial adsorption efficiency. Economic evaluation revealed the low cost-effectiveness of raw PTB, with an operational cost of 0.55 USD/m³, compared to 4.45 USD/m³ for the MWCNT-PTB composites. These results underscore the promise of both raw and MWCNT-modified PTB as sustainable, efficient, and scalable solutions for industrial wastewater treatment, offering a balance between performance and cost-effectiveness. | | note de thèses : | Thèse de doctorat en génie de procédés |
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Contribution to the valorization of a locally sourced plant-based biomaterial / Kelthoum Saadallah
