Guimarães Barbara Maria Ribeiro, Scatolino Mário Vanoli, Martins Maria Alice, Ferreira Saulo Rocha, Mendes Lourival Marin, Lima José Tarcísio, Junior Mario Guimarães, Tonoli Gustavo Henrique Denzin
Department of Forest Sciences, Federal University of Lavras - UFLA, Perimetral Av, POB 3037, Lavras, MG, Brazil.
Department of Production Engineering, State University of Amapá - UEAP, Macapá, AP, Brazil.
Environ Sci Pollut Res Int. 2022 Feb;29(6):8665-8683. doi: 10.1007/s11356-021-16203-4. Epub 2021 Sep 7.
The growing demand for products with lower environmental impact and the extensive applicability of cellulose nanofibrils (CNFs) have received attention due to their attractive properties. In this study, bio-based films/nanopapers were produced with CNFs from banana tree pseudostem (BTPT) wastes and Eucalyptus kraft cellulose (EKC) and were evaluated by their properties, such as mechanical strength, biodegradability, and light transmittance. The CNFs were produced by mechanical fibrillation (after 20 and 40 passages) from suspensions of BTPT (alkaline pre-treated) and EKC. Films/nanopapers were produced by casting from both suspensions with concentrations of 2% (based in dry mass of CNF). The BTPT films/nanopapers showed greater mechanical properties, with Young's modulus and tensile strength around 2.42 GPa and 51 MPa (after 40 passages), respectively. On the other hand, the EKC samples showed lower disintegration in water after 24 h and biodegradability. The increase in the number of fibrillation cycles produced more transparent films/nanopapers and caused a significant reduction of water absorption for both raw materials. The permeability was similar for the films/nanopapers from BTPT and EKC. This study indicated that attractive mechanical properties and biodegradability, besides low cost, could be achieved by bio-based nanomaterials, with potential for being applied as emulsifying agents and special membranes, enabling more efficient utilization of agricultural wastes.
对环境影响较小的产品的需求不断增长，以及纤维素纳米纤丝（CNFs）因其具有吸引力的特性而具有广泛的适用性，这已受到关注。在本研究中，用香蕉树假茎（BTPT）废料和桉木硫酸盐浆纤维素（EKC）中的CNFs制备了生物基薄膜/纳米纸，并通过其机械强度、生物降解性和透光率等性能进行了评估。通过机械纤维化（经过20和40次通过）从BTPT（碱预处理）和EKC的悬浮液中制备CNFs。通过浇铸由两种浓度为2%（基于CNF的干质量）的悬浮液制备薄膜/纳米纸。BTPT薄膜/纳米纸表现出更大的机械性能，杨氏模量和拉伸强度分别约为2.42 GPa和51 MPa（经过40次通过后）。另一方面，EKC样品在24小时后在水中的崩解和生物降解性较低。纤维化循环次数的增加产生了更透明的薄膜/纳米纸，并导致两种原料的吸水率显著降低。BTPT和EKC的薄膜/纳米纸的渗透性相似。本研究表明，除了低成本外，生物基纳米材料还可实现有吸引力的机械性能和生物降解性，具有用作乳化剂和特殊膜的潜力，从而能够更有效地利用农业废料。
