Fauzi Ahmad, Hapidin Dian Ahmad, Munir Muhammad Miftahul, Iskandar Ferry, Khairurrijal Khairurrijal
Department of Physics, Faculty of Natural Sciences and Mathematics, Institut Teknologi Bandung Jalan Ganesa 10 Bandung 40132 Indonesia
RSC Adv. 2020 May 4;10(29):17205-17216. doi: 10.1039/d0ra01077d. eCollection 2020 Apr 29.
A bilayer structure of a nylon 6 nanofibrous membrane on a cellulose membrane has been successfully developed for water filter application. The nylon 6 nanofibrous membrane was deposited on the cellulose membrane the electrospinning technique. The bilayer membrane properties, including mechanical strength, wettability, porosity, and microfiltration performance (flux and rejection), were thoroughly investigated. The membrane properties were studied using nylon 6 nanofibrous membranes having various fiber diameters and membrane thicknesses, which were obtained by adjusting the solution concentration and spinning time. The measurement of solution parameters, , viscosity, conductivity, and surface tension, showed a strong relationship between the solution concentration and these parameters, which later changed the fabricated fiber sizes. The FTIR spectra depicted complete solvent evaporation after the electrospinning process. Smaller nanofiber diameters could improve the mechanical strength of the membranes. The porosity test showed a strong relationship between the nanofiber diameter and the pore size and pore distribution of the membranes. The water contact angle measurement showed the significant influence of the cellulose membrane on increasing the hydrophilicity of the bilayer structure, which then improved the membrane flux. The particle rejection test, using PSL sizes of 308 and 450 nm, showed high rejection (above 98%) for all sample thickness variations. Overall, the bilayer structure of the nylon 6 nanofibers/cellulose membranes showed excellent and promising performance as water filter media.
一种用于水过滤应用的尼龙6纳米纤维膜在纤维素膜上的双层结构已成功开发出来。尼龙6纳米纤维膜通过静电纺丝技术沉积在纤维素膜上。对双层膜的性能，包括机械强度、润湿性、孔隙率和微滤性能（通量和截留率）进行了深入研究。使用具有不同纤维直径和膜厚度的尼龙6纳米纤维膜来研究膜的性能，这些膜是通过调整溶液浓度和纺丝时间获得的。对溶液参数，即粘度、电导率和表面张力的测量表明，溶液浓度与这些参数之间存在密切关系，这随后改变了所制备的纤维尺寸。傅里叶变换红外光谱（FTIR）表明静电纺丝过程后溶剂完全蒸发。较小的纳米纤维直径可以提高膜的机械强度。孔隙率测试表明纳米纤维直径与膜的孔径和孔分布之间存在密切关系。水接触角测量表明纤维素膜对增加双层结构的亲水性有显著影响，进而提高了膜通量。使用308和450纳米聚苯乙烯乳胶（PSL）尺寸进行的颗粒截留测试表明，对于所有样品厚度变化，截留率都很高（超过98%）。总体而言，尼龙6纳米纤维/纤维素膜的双层结构作为水过滤介质表现出优异且有前景的性能。
