Coconut shell activated carbon as an alternative adsorbent of inhibitors from lignocellulosic biomass pretreatment

Autor(es)

Freitas, Juliana V. ^{[1, 2]} ; Nogueira, Francisco G. E. ^[1] ; Farinas, Cristiane S. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Grad Program Chem Engn, BR-13565905 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentat, Rua 15 Novembro 1452, BR-13561206 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INDUSTRIAL CROPS AND PRODUCTS; v. 137, p. 16-23, OCT 1 2019.
• Citações Web of Science: 1

Resumo

The phenolic compounds and furaldehydes released during the pretreatment of lignocellulosic biomass can negatively affect the enzymatic hydrolysis and alcoholic fermentation steps in biorefineries. This work proposes the use of coconut shell activated carbon (CSAC) as an agroindustrial residue-based adsorbent for the removal of the main inhibitors released in the hydrothermal pretreatment of sugarcane bagasse. The prepared CSAC showed a pore distribution favorable for the adsorption of molecules of different sizes, together with a negative surface charge profile in the pH range from 2 to 10. Adsorption isotherms showed that the CSAC presented high affinity for the phenolic compounds vanillin (monomeric) and tannic acid (oligomeric), as well as for the total phenolics present in an inhibitor cocktail. The CSAC also showed efficient adsorption of the phenolic compounds from the pretreatment liquor, without any removal of the sugars, hence displaying a useful high degree of selectivity. The enzymatic hydrolysis of pretreated sugarcane bagasse in the presence of the liquor treated with 2% (m/v) CSAC resulted in a 30% increase in the amount of glucose released, while the alcoholic fermentation efficiency was enhanced up to 14-fold, with complete removal of furaldehydes. These findings indicated that CSAC is an efficient and selective adsorbent of phenolic and furaldehyde inhibitors. It represents an alternative renewable material that could be used to improve the efficiencies of both the enzymatic hydrolysis and the alcoholic fermentation processes in future biorefineries. (AU)

• Processo FAPESP: 16/10636-8 - Da fábrica celular à biorrefinaria integrada Biodiesel-Bioetanol: uma abordagem sistêmica aplicada a problemas complexos em micro e macroescalas
• Beneficiário: Roberto de Campos Giordano
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático
• Processo FAPESP: 14/19000-3 - Simplificação do processo de conversão de biomassa a etanol por meio da integração da produção de enzimas in-house
• Beneficiário: Cristiane Sanchez Farinas
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular