Lou Yanling, Xi Jianfeng, Meng Liucheng, Yan Zifei, Deng Wen, Bian Huiyang, Xiao Huining, Wu Weibing
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China.
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China.
Carbohydr Polym. 2025 Jan 15;348(Pt A):122807. doi: 10.1016/j.carbpol.2024.122807. Epub 2024 Sep 27.
A hybrid ultrafiltration membrane based on nanocellulose and zinc oxide nanoparticles (ZnO NPs) was prepared by simple layered filtration without any chemical modification. Microscopic morphology analysis showed that the loading ZnO NPs significantly increased the membrane roughness, and wettability test demonstrated that the membrane surface possessed underwater superoleophobicity. Due to the "puncture effect" of the embedded ZnO NPs, abundant nanochannels were formed in the nanocellulose membrane and the highest water permeance of 5439.7 L·m·h·bar was achieved. The hybrid membranes exhibited high rejection of nanoparticles larger than 20 nm and macromolecules with molecular weights higher than 100 kDa. Furthermore, ZnO NPs significantly improved the wet tensile strength of membrane. The hybrid membranes achieved high separation efficiency of nano-sized emulsions via size exclusion and demulsification effect, as well as the efficient removal of organic dyes and antibiotics via filtration-adsorption. The combination of underwater superoleophobicity and photocatalytic self-cleaning performance effectively solved the problem of a sharp decrease in permeance caused by oil contamination. This type of nanocellulose/ZnO hybrid membrane, which integrates high permeance, high filtration accuracy, and photocatalytic anti-fouling performance in one design, offers an innovative approach to the preparation of nanocellulose membranes for the treatment of organic wastewater.
通过简单的层状过滤制备了一种基于纳米纤维素和氧化锌纳米颗粒（ZnO NPs）的混合超滤膜，无需任何化学改性。微观形态分析表明，负载ZnO NPs显著增加了膜的粗糙度，润湿性测试表明膜表面具有水下超疏油性。由于嵌入的ZnO NPs的“穿刺效应”，在纳米纤维素膜中形成了丰富的纳米通道，实现了5439.7 L·m·h·bar的最高水渗透率。该混合膜对大于20 nm的纳米颗粒和分子量高于100 kDa的大分子具有高截留率。此外，ZnO NPs显著提高了膜的湿拉伸强度。该混合膜通过尺寸排阻和破乳效应实现了对纳米级乳液的高分离效率，以及通过过滤吸附有效去除有机染料和抗生素。水下超疏油性和光催化自清洁性能的结合有效地解决了油污导致渗透率急剧下降的问题。这种在一种设计中集成了高渗透率、高过滤精度和光催化抗污染性能的纳米纤维素/ZnO混合膜，为制备用于处理有机废水的纳米纤维素膜提供了一种创新方法。
