Pini Pereira Priscila, Pacola Gonçalves Isabela, Molina Luiza C A, Delcolle Roberta, Dzyazko Yuliya S, Moser Paraiso Carolina, Batista Neto Guilherme L, Diório Alexandre, Marquetotti Salcedo Vieira Angélica, Bergamasco Rosângela
Department of Chemical Engineering, State University of Maringá, 5790 Colombo Ave., Maringá 87020-900, PR, Brazil.
V.I. Vernadskii Institute of General and Inorganic Chemistry of the National Academy of Science of Ukraine, Palladin Ave. 32/34, 03142 Kyiv, Ukraine.
Membranes (Basel). 2025 Apr 1;15(4):105. doi: 10.3390/membranes15040105.
3D-printing enables the fabrication of membranes with desired shapes and geometrical parameters. In this study, a membrane for pressure-driven processes was manufactured in a single step using the fused deposition modeling (FDM) technique. The membrane was produced from a mixture of polylactic acid (PLA) with sucrose as a pore-forming agent. Sucrose was removed from the final membrane by washing it with water. The membrane consists of three layers, and this sandwich-like structure ensures its mechanical stability. The material obtained was characterized using SEM and AFM imaging, as well as nitrogen adsorption-desorption and contact angle measurements. The porosity of each layer of the membrane is due to a loose region, which is coated on both sides with a dense film formed during printing. The pores responsible for rejection capability can be found in grooves between the polymer stripes in the dense layer. The membrane exhibits a water permeability of 64 L mhbar, with a molecular weight cut-off of 69 kDa. The PLA membrane can be used for polyphenol concentration, demonstrating a permeability of 2-3.4 L mhbar and a selectivity towards these compounds of 78-98% at 0.5 bar, with a flux decline ratio of up to 50%.
3D打印能够制造出具有所需形状和几何参数的膜。在本研究中，采用熔融沉积建模（FDM）技术一步制造出用于压力驱动过程的膜。该膜由聚乳酸（PLA）与作为致孔剂的蔗糖的混合物制成。通过用水洗涤从最终膜中去除蔗糖。该膜由三层组成，这种类似三明治的结构确保了其机械稳定性。使用扫描电子显微镜（SEM）和原子力显微镜（AFM）成像以及氮吸附-解吸和接触角测量对所得材料进行表征。膜的每一层的孔隙率归因于一个疏松区域，该区域在两侧涂覆有打印过程中形成的致密膜。负责截留能力的孔可以在致密层中聚合物条带之间的凹槽中找到。该膜的水渗透率为64 L mhbar，截留分子量为69 kDa。聚乳酸膜可用于多酚浓缩，在0.5 bar下表现出2 - 3.4 L mhbar的渗透率和对这些化合物78 - 98%的选择性，通量下降率高达50%。
