Lignocellulosic materials are promising sources of energy and biomaterials. In this context, the biomass from the mesocarp of the green coconut can be used to produce nanocellulose. For this purpose, this work proposed approaches for pretreatment of coconut biomass using protic ionic liquids (PILs), which are solvents that have specific characteristics and less environmental impact, followed by acid hydrolysis to obtain lignin-containing nanocellulose. Thus, three PILs were produced, and two pretreatment methodologies were evaluated. The results showed that, when using the ionic liquid 2-HEAA and Methodology B, there was a delignification of 17.4 %, a reduction of 14 % of hemicelluloses and a gain of 50.8 % of cellulose. Furthermore, acid hydrolysis provided a stable suspension of lignin-containing cellulose nanocrystals (zeta potential of −34.6 mV) with particles in the nanometer scale and more thermally resistant. When testing these lignin-containing cellulose nanocrystals as a stabilizer for oil-in-water emulsions, satisfactory results were obtained at a concentration of 0.50 %, which generated a stable emulsion for 14 days (−47.5 mV of zeta potential and mean diameter of 6.23 µm).

木质纤维素材料是有前景的能源和生物材料来源。在这种情况下，来自绿色椰子中果皮的生物质可用于生产纳米纤维素。为此，本工作提出了使用质子离子液体 (PIL) 预处理椰子生物质的方法，质子离子液体是具有特定特性且对环境影响较小的溶剂，然后酸水解以获得含木质素的纳米纤维素。因此，产生了三种 PIL，并评估了两种预处理方法。结果表明，当使用离子液体 2-HEAA 和方法 B 时，脱木质素为 17.4%，半纤维素减少了 14%纤维素增加 50.8%。此外，酸水解提供了含有木质素的纤维素纳米晶体的稳定悬浮液（zeta 电位为 -34.6 mV），其颗粒为纳米级且更耐热。当测试这些含木质素的纤维素纳米晶体作为水包油乳液的稳定剂时，在 0.50% 的浓度下获得了令人满意的结果，产生了 14 天的稳定乳液（-47.5 mV 的 zeta 电位和平均直径为 6.23微米）。