Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand.
MoRe Research Örnsköldsvik AB, SE-89122 Örnsköldsvik, Sweden.
Int J Mol Sci. 2023 Mar 23;24(7):6030. doi: 10.3390/ijms24076030.
Textile industries currently face vast challenges for the active removal of colored wastewater. Indeed, sustainable, recyclable, and green approaches are still lacking to achieve this aim. Thus, the present study explored the utilization of highly functional, green, recyclable, fully bio-based, and cost-effective composite membranes from post-consumer cotton fabrics and palm waste for wastewater treatment purposes. Highly functional cellulose nanofibers (CNF) were produced from waste cotton fabrics and filter paper using an acid hydrolysis technique. The yield of nanofibers extracted from waste cotton fabrics and filter paper was 76.74 and 54.50%, respectively. The physical, chemical, and structural properties of nanofibers were studied using various advanced analytical techniques. The properties of isolated nanofibers were almost similar and comparable to those of commercial nanofibers. The surface charge densities were -94.0, -80.7, and -90.6 mV for the nanofibers of palm waste, cotton fibers, and filter paper, respectively. After membrane fabrication using vacuum and hot-pressing techniques, the characteristics of the membrane were analyzed. The results showed that the average pore size of the palm-waste membrane was 1.185 nm, while it was 1.875 nm for membrane from waste cotton fibers and filter paper. Congo red and methylene blue dyes were used as model solutions to understand the behavior of available functional groups and the surface ζ-potential of the membrane frameworks' interaction. The membrane made from palm waste had the highest dye removal efficiency, and it was 23% for Congo red and 44% for methylene blue. This study provides insights into the challenges associated with the use of postconsumer textile and agricultural waste, which can be potentially used in high-performance liquid filtration devices for a more sustainable society.
纺织行业目前面临着去除有色废水的巨大挑战。事实上，为了实现这一目标，仍然缺乏可持续、可回收、绿色的方法。因此，本研究探索了利用高功能、绿色、可回收、完全基于生物的、具有成本效益的复合膜，从消费后的棉织物和棕榈废料中处理废水。使用酸水解技术从废棉织物和滤纸中生产出高功能的纤维素纳米纤维（CNF）。从废棉织物和滤纸中提取纳米纤维的产率分别为 76.74%和 54.50%。使用各种先进的分析技术研究了纳米纤维的物理、化学和结构特性。分离出的纳米纤维的性质几乎与商业纳米纤维相似且相当。棕榈废料、棉纤维和滤纸的纳米纤维的表面电荷密度分别为-94.0、-80.7 和-90.6 mV。使用真空和热压技术制造膜后，分析了膜的特性。结果表明，棕榈废料膜的平均孔径为 1.185nm，而废棉纤维和滤纸膜的平均孔径为 1.875nm。使用刚果红和亚甲基蓝染料作为模型溶液，以了解可用官能团的行为和膜框架表面 ζ-电位的相互作用。由棕榈废料制成的膜对刚果红和亚甲基蓝的去除效率最高，分别为 23%和 44%。本研究深入了解了使用消费后纺织品和农业废物所面临的挑战，这些废物可潜在地用于高性能液体过滤装置，以实现更可持续的社会。
