Sugarcane Bagasse Fly Ash as a No-Cost Adsorbent for Removal of Phenolic Inhibitors and Improvement of Biomass Saccharification

Autor(es)

Freitas, Juliana V. ^{[1, 2]} ; 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 14 Novembro 1452, BR-13561206 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 5, n. 12, p. 11727-11736, DEC 2017.
• Citações Web of Science: 4

Resumo

The phenolic compounds generated during the pretreatment of lignocellulosic biomass have inhibitory effects on the enzymatic hydrolysis and fermentation steps in biorefineries employing the biochemical platform. This work proposes the use of sugarcane bagasse fly ash as a no-cost adsorbent for removal of the phenolics generated by the liquid hot water (LHW) pretreatment of sugarcane bagasse. Physical chemical characterization revealed that the sugarcane bagasse fly ash was mesoporous and possessed a surface charge that promoted the adsorption of monomeric (vanillin) as well as oligomeric (tannic acid) phenolic compounds, under different conditions of pH and temperature. Adsorption isotherms for the fly ash revealed similar maximum capacities for both types of phenolic compound. The potential use of the fly ash as an adsorbent for biomass pretreatment inhibitors was demonstrated by the removal of 80% of the phenolics from the LHW liquor, which resulted in a remarkable 52% increase in the glucose released the enzymatic hydrolysis of sugarcane bagasse. The findings demonstrated that the use of sugarcane bagasse fly ash to remove phenolic compounds could effectively increase the efficiency of enzymatic hydrolysis of lignocellulosic biomass, with performance similar to that of commercial activated carbon. In addition, there is no cost for the acquisition of the fly ash, making the process highly economically attractive for implementation in future large-scale 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