Extração de frações lignocelulósicas por pré-tratamento alcalino em resíduo de coco

Abstract

The growing interest in sustainable materials and efficient separation processes for lignocellulosic biomass has contributed to a series of investigations on pretreatments of agro-industrial waste. Thus, this work aimed to apply alkaline pretreatment to coconut residue for extraction of hemicellulose and lignin fractions, aiming to obtain cellulose pulp under mild experimental conditions. Initially, coconut fibers (CF) were pretreated by the Soxhlet method and then subjected to alkaline pretreatment at 55°C, 120 min and 2% NaOH. To evaluate the effectiveness of this process, chemical and structural analyses were performed. Chemical composition analyses confirmed a delignification of 15.30%, removal of 52.83% of hemicellulose and an increase of 22% in cellulose content. FT-IR analysis corroborated the changes in the chemical structure of the sample, while TGA analysis revealed a significant mass loss in the specific temperature range of cellulose, evidencing the efficient removal of the other components. Thus, this study promotes the valorization of agro-industrial waste and the implementation of an efficient pre-treatment process, which contributes to obtaining bioproducts.