Exploring the Potential of Waste Biomass from the Brazilian Legal Amazon in Bioproducts Production: a Comprehensive Analysis and Promising Perspectives

The Legal Amazon Region has numerous lignocellulosic biomasses with unknown technological properties, contrasting with an urgent demand for energy transition towards a more sustainable economy. This study analyzed the biomasses of baru husk (BH), cupuaçu husk (CH), and pequi seed (PS) through slow pyrolysis at 650 °C to assess the suitability of the bio-oils and biochars as potential biorefinery bioproducts. The physicochemical characterizations showed that all residues are potential candidates for bioproduct production, with CH biomass obtaining the best results for biochar production due to its high carbon content (80.65%) and surface area of 298.0491 m2 g-1, while BH and PS are more suitable for bio-oil production due to their high volatile matter content (> 84%). The main compounds in the bio-oil identified by gas chromatography-mass spectrometry (GC-MS) were phenolic (48.5, 56.7, and 60.36% for BH, CH, and PS, respectively) and furanic (22, 12.17, and 10.28% for BH, CH, and PS, respectively). Finally, it is concluded that based on the physicochemical and morphological characteristics obtained in this study, the pyrolysis products have potential for future investigation in various processes such as adsorption, carbon sequestration, and obtaining valuable chemical compounds, contributing to the promotion of the bioeconomy through sustainable waste management.