Zhu Wenxin, Huang Wei, Zhou Wenhua, Qiu Zhe, Wang Zheng, Li Haojun, Wang Yonggui, Li Jian, Xie Yanjun
Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, 150040, Hexing Road 26, Harbin, PR China.
Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, 150040, Hexing Road 26, Harbin, PR China.
Carbohydr Polym. 2020 Oct 1;245:116587. doi: 10.1016/j.carbpol.2020.116587. Epub 2020 Jun 12.
Bio-based membranes for emulsion separation are sustainable, low-cost, renewable, biodegradable, and nontoxic. Herein, an antibacterial sandwich-like composite paper was fabricated by a facile process using Ag nanoparticles (Ag NPs)-coated pulp fibers and cellulose nanofibrils (CNFs). The obtained Ag-Pulp/CNF composite paper was superhydrophilic, allowing a 96 % separation efficiency for various oil-in-water emulsions. This outstanding separation efficiency was maintained over 20 separation cycles. The composite paper also showed satisfactory separation performance for water-in-oil emulsions after modification to render the surface hydrophobic. The CNFs provided the composite a nanoscale pore, which rejected nearly 100 % of bacteria when used to filter bacteria-contaminated emulsions due to a physical barrier effect. Attributed to the intrinsic antibacterial capability of Ag NPs, the composite paper exhibited strong antibacterial performance against Escherichia coli. Thus, the composite paper that was mainly derived from sustainable pulp fibers exhibited potential performance for oil/water separation and water purification.
用于乳液分离的生物基膜具有可持续、低成本、可再生、可生物降解和无毒的特点。在此，通过一种简便的工艺，使用涂有银纳米颗粒（Ag NPs）的纸浆纤维和纤维素纳米纤维（CNFs）制备了一种抗菌三明治状复合纸。所制备的Ag-纸浆/CNF复合纸具有超亲水性，对各种水包油乳液的分离效率可达96%。这种出色的分离效率在20个分离循环中得以保持。在对复合纸表面进行改性使其具有疏水性后，其对油包水乳液也表现出令人满意的分离性能。CNFs为复合材料提供了纳米级孔隙，当用于过滤受细菌污染的乳液时，由于物理屏障效应，该孔隙几乎能截留100%的细菌。由于Ag NPs固有的抗菌能力，复合纸对大肠杆菌表现出强大的抗菌性能。因此，这种主要由可持续纸浆纤维制成的复合纸在油/水分离和水净化方面展现出潜在性能。
