Cellulose and Paper Department and Centre of Excellence for Advanced Sciences, National Research Centre, 33 El-Buhouth street, Dokki, 12622, Giza, Egypt.
Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187, Luleå, SE, Sweden.
Sci Rep. 2020 Jul 9;10(1):11278. doi: 10.1038/s41598-020-67909-3.
There has been an increasing interest in recent years in isolating cellulose nanofibers from unbleached cellulose pulps for economic, environmental, and functional reasons. In the current work, cellulose nanofibers isolated from high-lignin unbleached neutral sulfite pulp were compared to those isolated from bleached rice straw pulp in making thin-film ultrafiltration membranes by vacuum filtration on hardened filter paper. The prepared membranes were characterized in terms of their microscopic structure, hydrophilicity, pure water flux, protein fouling, and ability to remove lime nanoparticles and purify papermaking wastewater effluent. Using cellulose nanofibers isolated from unbleached pulp facilitated the formation of a thin-film membrane (with a shorter filtration time for thin-film formation) and resulted in higher water flux than that obtained using nanofibers isolated from bleached fibers, without sacrificing its ability to remove the different pollutants.
近年来，出于经济、环境和功能等方面的原因，人们越来越感兴趣地从未漂白纸浆中分离出纤维素纳米纤维。在本工作中，通过在硬化滤纸上进行真空过滤，将从高木质素未漂中性亚硫酸盐浆中分离出的纤维素纳米纤维与从漂白稻秸浆中分离出的纤维素纳米纤维进行比较，用于制备薄膜超滤膜。通过微观结构、亲水性、纯水通量、蛋白质污染、去除石灰纳米颗粒和净化造纸废水的能力对所制备的膜进行了表征。使用未漂浆分离得到的纤维素纳米纤维有利于形成薄膜（形成薄膜的过滤时间更短），并产生比使用漂白纤维分离得到的纳米纤维更高的水通量，同时不牺牲其去除不同污染物的能力。
