Effect of Thermal Treatment on Functional Group Transformation of Empty Fruit Bunch (EFB) Biomass at 150–200°C: An FTIR Spectroscopic Analysis. International Journal of Engineering and Technology (IJET). 2025;2(1):158-167. Accessed September 8, 2025. https://e-journal.scholar-publishing.org/index.php/ijet/article/view/95