Brazil is the second-largest world producer of pineapple and generates almost 45% of its initial mass in wastes after industrialization, mainly due to the inappropriate deposition of peel and crown, which contribute to environmental damage. In this study, pineapple crown fibers (PCF) residues were investigated as an essential alternative to produce cellulose nanocrystals (CNC). It was used a free-chlorite hydrolysis reaction combined with sulfuric acid using different times and acid concentrations to obtain CNC after obtaining of the bleached cellulose. CNC`s were characterized by zeta potential, TGA, XRD, FTIR, and TEM. The main results showed that the chemical treatments were efficient in the removal of amorphous components, increasing the fiber whiteness and the crystallinity index. The best result obtained was for a concentration of 64% of H₂SO₄ for two hours with values of particle size of c.a. 140 nm and Zeta potential of − 47.96 mV, validating the use of the PCF for CNC.

巴西是世界第二大菠萝生产国，工业化后的废物产生量几乎占其初始质量的45％，这主要归因于果皮和树冠的不适当沉积，这对环境造成了破坏。在这项研究中，菠萝冠纤维（PCF）残留物被研究为生产纤维素纳米晶体（CNC）的基本替代方法。在获得漂白纤维素后，将其与亚硫酸盐进行游离亚氯酸盐水解反应，与硫酸组合使用不同的时间和酸浓度，以得到CNC。CNC的特征在于zeta电位，TGA，XRD，FTIR和TEM。主要结果表明，化学处理可有效去除非晶态成分，增加纤维白度和结晶度指数。获得的最佳结果是浓度为64％的H₂ SO ₄持续两个小时，粒径约为140 nm，Zeta电位为− 47.96 mV，验证了PCF在CNC上的使用。