Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, Jiangsu Province 212013, PR China.
Research School of Polymeric Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, Jiangsu Province 212013, PR China.
Carbohydr Polym. 2022 Oct 15;294:119756. doi: 10.1016/j.carbpol.2022.119756. Epub 2022 Jun 21.
Nanofibrous membrane have great potential in the field of water purification due to the high porosity and large specific surface area. Herein, a dual layers nanofibrous membrane was prepared by combining an active layer containing carbon nanotubes (CNTs) with a porous chitosan (CS)/polyvinylpyrrolidone (PVP)/polyvinyl alcohol (PVA) nanofibrous support layer via electrospinning-electrospray technique for highly efficient heavy metal and organic pollutants removal. Incorporating CNTs into the active layer offered additional nanochannels which significantly enhanced pure water permeate flux (1533.26 L·m·h) and heavy metal ions/dyes rejection (Cu 95.68 %, Ni 93.86 %, Cd 88.52 %, Pb 80.41 %, malachite green 87.20 %, methylene blue 76.33 %, and crystal violet 63.39 %). The optimal membranes were formed with a thickness of 20 μm and a roughness of 142 nm while still showing good perm-selectivity compared with commercial PVDF membrane. Moreover, the constructed membrane exhibited good antifouling property and long-term stability during filtration process. This work provides a new strategy to fabricate advanced separation membranes for water treatment.
纳米纤维膜由于其高孔隙率和大比表面积，在水净化领域具有巨大的应用潜力。本文通过静电纺丝-电喷技术，将含有碳纳米管（CNTs）的活性层与多孔壳聚糖（CS）/聚乙烯吡咯烷酮（PVP）/聚乙烯醇（PVA）纳米纤维支撑层相结合，制备了一种双层纳米纤维膜，用于高效去除重金属和有机污染物。将 CNTs 掺入活性层中提供了额外的纳米通道，显著提高了纯水渗透通量（1533.26 L·m·h）和重金属离子/染料的去除率（Cu 95.68%、Ni 93.86%、Cd 88.52%、Pb 80.41%、孔雀石绿 87.20%、亚甲基蓝 76.33%和结晶紫 63.39%）。最佳膜的厚度为 20 µm，粗糙度为 142 nm，与商业 PVDF 膜相比仍表现出良好的选择渗透性。此外，在过滤过程中，所构建的膜表现出良好的抗污染性和长期稳定性。这项工作为水处理中先进分离膜的制备提供了一种新策略。
