Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 1):126486. doi: 10.1016/j.ijbiomac.2023.126486. Epub 2023 Aug 25.
Anti-ultraviolet material with cost-effectiveness, environmental friendliness, and multifunction is urgently needed to address the serious problem of ultraviolet radiation. However, traditional anti-ultraviolet products based on plastics are unsustainable and harmful to the environment. Herein, the cellulose films with a sandwich structure using a surface assembly technique were reported. Natural L-phenylalanine was grafted onto cellulose nanofibrils via amidation to enhance their UV-shielding property. To address the hydrophilic nature and limited mechanical strength of cellulose films, we employed octadecyltrichlorosilane and 4ARM-PEG-NH for hydrophobic coating and mechanical reinforcement, respectively. In addition to providing complete UV resistance in the wavelength range of 200-320 nm, sample OPT5 exhibited significantly improved tensile stress, Young's modulus, and toughness, measuring 174.09 MPa, 71.11 MPa, and 295.33 MJ/m, respectively. Furthermore, due to the presence of antibacterial amine groups, the modified film demonstrated a satisfactory inhibitory effect on the growth of Escherichia coli and Bacillus subtilis. Compared to natural cellulose films, the hydrophobically modified material achieved a contact angle of up to 121.1°, which enabled efficient separation of oil-water mixtures with a maximum separation efficiency of 93.87 %. In summary, the proposed TOCNF-based UV-shielding film with multifunctionality holds great potential for replacing petrochemical-derived plastics and serving as an applicable and sustainable membrane material.
具有成本效益、环保和多功能的抗紫外线材料是解决严重紫外线辐射问题的迫切需要。然而，基于塑料的传统抗紫外线产品是不可持续的，对环境有害。在此，报道了一种使用表面组装技术的具有三明治结构的纤维素薄膜。通过酰胺化将天然 L-苯丙氨酸接枝到纤维素纳米纤维上，以增强其紫外线屏蔽性能。为了解决纤维素薄膜的亲水性和有限的机械强度问题，我们分别采用十八烷基三氯硅烷和 4ARM-PEG-NH 进行疏水涂层和机械增强。除了在 200-320nm 的波长范围内提供完全的抗紫外线性能外，样品 OPT5 还表现出显著提高的拉伸应力、杨氏模量和韧性，分别为 174.09MPa、71.11MPa 和 295.33MJ/m。此外，由于存在抗菌胺基团，改性膜对大肠杆菌和枯草芽孢杆菌的生长表现出令人满意的抑制作用。与天然纤维素薄膜相比，疏水处理后的材料的接触角高达 121.1°，能够有效地分离油水混合物，最大分离效率可达 93.87%。总之，所提出的基于 TOCNF 的具有多功能性的屏蔽紫外线薄膜具有替代石化衍生塑料的巨大潜力，并可作为一种适用且可持续的膜材料。
