Cordeiro Camila Cássia, Medeiros Alessandra Ruyz, Fraga Gabriel Nardi, Paschoal Sirlei Marques, Dragunski Douglas Cardoso, Fiorentin-Ferrari Leila Denise
Postgraduate Program in Chemical Engineering, Western Paraná State University - Unioeste, 3141 Guaíra Street, Jd. Santa Maria, Toledo, 85903-220, PR, Brazil.
Postgraduate Program in Chemical Engineering, Department of Chemical Engineering, State University of Maringá, Av. Colombo 5790, Bloco D90, Maringá, 87020-900, PR, Brazil.
Int J Biol Macromol. 2025 Sep;322(Pt 1):146404. doi: 10.1016/j.ijbiomac.2025.146404. Epub 2025 Aug 5.
This study aimed to fabricate nonwoven materials from chitosan (QTS) polymeric fibers with poly(ethylene oxide) (PEO) and poly(vinyl alcohol) (PVA) fibers using the electrospinning technique. The chitosan and poly(ethylene oxide) nonwoven (QTS-PEO) was applied for the removal of the reactive red dye BF-4B. The materials were crosslinked and characterized using various techniques, such as thermal, structural and morphological characterizations. Batch adsorption experiments evaluated parameters such as pH (2-10), equilibrium time (1-24 h), and solution concentration (5mg/L to 35mg/L). Additionally, a fixed-bed filtration system in a sandwich format with chitosan nonwovens with PEO and PVA (PVA/QTS-PEO/PVA) was assembled and tested. The analyses showed thermal stability up to 100 °C and characteristic polymeric bands were observed by Fourier Transform Infrared Spectroscopy. Batch adsorption experiments indicated that equilibrium was reached in 24 h, with an optimal pH of 5.8 ± 0.2 and 100% dye removal at all tested concentrations. Equilibrium isotherms were favorable, with a maximum adsorption capacity of 145mg/g at a concentration of 35mg/L. The Freundlich empirical model best fitted the data, suggesting multilayer adsorption. The fixed-bed system demonstrated good mechanical stability due to the PVA support, allowing three consecutive permeation cycles with a maximum dye rejection of 39%. Thus, the study confirms the feasibility of using biodegradable polymers for the treatment of dye-contaminated wastewater, providing a sustainable alternative for environmental preservation.
本研究旨在利用静电纺丝技术，用壳聚糖（QTS）聚合物纤维与聚环氧乙烷（PEO）和聚乙烯醇（PVA）纤维制备非织造材料。壳聚糖和聚环氧乙烷非织造材料（QTS-PEO）用于去除活性红染料BF-4B。使用各种技术对材料进行交联和表征，如热、结构和形态表征。分批吸附实验评估了诸如pH值（2-10）、平衡时间（1-24小时）和溶液浓度（5mg/L至35mg/L）等参数。此外，还组装并测试了一种带有PEO和PVA的壳聚糖非织造材料的三明治形式的固定床过滤系统（PVA/QTS-PEO/PVA）。分析表明，材料在高达100°C的温度下具有热稳定性，通过傅里叶变换红外光谱观察到了特征聚合物谱带。分批吸附实验表明，24小时内达到平衡，最佳pH值为5.8±0.2，在所有测试浓度下染料去除率均为100%。平衡等温线良好，在浓度为35mg/L时最大吸附容量为145mg/g。Freundlich经验模型最符合数据，表明为多层吸附。由于PVA的支撑，固定床系统表现出良好的机械稳定性，允许进行三个连续的渗透循环，最大染料截留率为39%。因此，该研究证实了使用可生物降解聚合物处理染料污染废水的可行性，为环境保护提供了一种可持续的替代方案。
