Cellulose Extraction from Robusta Coffee Husk (Coffea canephora) as Alternative Material from Sustainable Agricultural Waste Utilization

Coffee husk is one of the main sources of lignocellulose biomass, mainly containing 59.32 cellulose, 7.62 hemicellulose, 3.39 lignin, and others. Due to its composition, the cellulose-based coffee husk can be utilized as an alternative sustainable material for various industrial applications. Therefore, this research aimed to investigate cellulose content in the robusta coffee husk waste through extraction by delignification and bleaching methods. The yield of cellulose from coffee husk ranged from 8.58 to 10.33, or an average of 9.25. There was an increase in cellulose content after the delignification (42.69), compared to the previous without delignification (17.31), as well as a decrease in lignin content (18.65). Further characterization using FTIR spectroscopy confirmed the presence of a hydroxyl group (O-H) bound by a hydrogen bond at 3330.68 cm-1, indicating the main characteristics of cellulose. This research revealed the potency of robusta coffee husk waste as an alternative material source, offering dual benefits: mitigating waste management issues while providing added value to this often-overlooked byproduct. These findings could significantly contribute to the broader scope of sustainable materials and highlight the potential of agricultural waste as a critical player in the circular economy. © 2025 Institute of Physics Publishing. All rights reserved.