| Full text | |
| Author(s): |
Castro, Luiz E. N.
;
Barrionuevo, Manoel V. F.
;
Bevilaqua, Gabriel C.
;
Barroso, Tiago L. C. T.
;
Ferreira, Vanessa C.
;
Esperanca, Jose M. S. S.
;
Rostagno, Mauricio A.
;
Esteves, Isabel A. A. C.
;
Forster-Carneiro, Tania
Total Authors: 9
|
| Document type: | Journal article |
| Source: | ACS ENGINEERING AU; v. N/A, p. 25-pg., 2025-12-17. |
| Abstract | |
This study explores the production of adsorbents from grape pomace (Vitis vinifera L.) via subcritical water hydrolysis (SWH) and their application as sustainable materials for removing fermentation inhibitors. Grape pomace, an abundant lignocellulosic byproduct of the wine industry, underwent SWH to yield a hydrolysis residue, which was subsequently chemically and thermally modified to generate various adsorbents (C2-C4). Among these, the C4 material, activated with phosphoric acid and treated under autoclave conditions, exhibited the most favorable properties, including a high surface area (777.2 m2 g-1), microporosity, surface acidity, and negative surface charge. Batch and fixed-bed adsorption experiments confirmed C4's superior capacity to selectively adsorb inhibitory compounds such as acetic acid, 5-hydroxymethylfurfural (5-HMF), and furfural, while preserving fermentable sugars. The adsorption mechanisms were comprehensively analyzed using kinetic, equilibrium, and thermodynamic models. Adsorption was determined to be spontaneous and endothermic, primarily governed by physisorption, as evidenced by low activation energies and favorable thermodynamic parameters. Regeneration studies demonstrated that C4 could be effectively reused for over five cycles with minimal loss of adsorption capacity, particularly for furfural and 5-HMF, using alkaline water as the eluent. The practical utility of C4 was validated through fermentability tests, which demonstrated significantly improved performance in detoxified hydrolysates, including a 3.2-fold increase in ethanol production compared to nondetoxified samples, as well as xylitol production. Overall, this study highlights the promise of subcritical hydrochar produced from water as an affordable, effective, and eco-friendly adsorbent suitable for biorefinery processes. (AU) | |
| FAPESP's process: | 24/06628-6 - Sustainable production of platform chemicals with a circular economy approach: leveraging the role of coconut byproducts (Cocos nucifera) in a biorefinery context |
| Grantee: | Vanessa Cosme Ferreira |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 18/14938-4 - Waste2energy: integration of supercritical technologies and anaerobic digestion through an automated system for the production of biofuel precursors |
| Grantee: | Tânia Forster Carneiro |
| Support Opportunities: | Research Grants - Young Investigators Grants - Phase 2 |
| FAPESP's process: | 24/07269-0 - Cocoa pod husk: biomass valorization by emerging pretreatment and fermentative processes |
| Grantee: | Gabriel Cicalese Bevilaqua |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 23/02064-8 - Sustainable bioprocesses for the valorization of cashew apple bagasse (Anacardium occidentale): integration of hydrothermal pretreatment and fermentation processes to produce value-added compounds in a biorefinery concept |
| Grantee: | Tiago Linhares Cruz Tabosa Barroso |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 18/14582-5 - Development of a two-dimensional extraction, separation and analysis system for evaluating the bioactivity of phytochemicals |
| Grantee: | Maurício Ariel Rostagno |
| Support Opportunities: | Research Grants - Young Investigators Grants - Phase 2 |
| FAPESP's process: | 21/04096-9 - Integration of the extraction/hydrolysis processes in subcritical water and purification for the valuation of grape bagasse in a biorrefinery concept |
| Grantee: | Luiz Eduardo Nochi de Castro |
| Support Opportunities: | Scholarships in Brazil - Doctorate |