Department of Chemistry and Chemical Engineering, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083, China.
School of Chemistry, Beihang University, Beijing 100191, China; Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, Stockholm 10044, Sweden.
Int J Biol Macromol. 2020 May 15;151:159-167. doi: 10.1016/j.ijbiomac.2020.02.124. Epub 2020 Feb 13.
Cellulose acetate (CA) ultrafiltration membranes are attracting more attention in wastewater purification due to its biodegradability and eco-friendly. The application of CA membranes, however, is limited by high susceptibility to bacterial corrosion and lack of mechanical tolerance that results in loss of life. To solve the above problems, we first fabricated the CA-based composite membranes incorporated with bamboo-based lignocellulose nanofibrils (LCNFs) by a strategy of phase inversion. LCNFs was prepared by using a combined method of one-step chemical pretreatment and acid hydrolysis coupled with high-pressure homogenization. The as-prepared CA/LCNFs composite membranes with 4 wt% lignin in the LCNFs exhibited high tensile strength of 7.08 MPa and strain-at-break of 12.21%, and high filtration permeability of 188.23 L·m·h as ultrafiltration membranes for wastewater treatment, which could obviously inhibit the growth of Escherichia coli.
醋酸纤维素（CA）超滤膜由于其可生物降解性和环保性，在废水净化方面受到越来越多的关注。然而，CA 膜的应用受到其对细菌腐蚀性的高度敏感性和缺乏机械耐受性的限制，这导致其使用寿命缩短。为了解决上述问题，我们首先通过相转化法制备了含有竹基木质素纳米纤维（LCNFs）的 CA 基复合膜。LCNFs 是通过一步化学预处理和酸水解与高压匀浆相结合的方法制备的。所制备的 CA/LCNFs 复合膜中 LCNFs 的木质素含量为 4wt%时，表现出 7.08MPa 的高拉伸强度和 12.21%的断裂伸长率，以及作为超滤膜用于废水处理的 188.23L·m·h 的高过滤渗透率，可明显抑制大肠杆菌的生长。
