Advanced Water Production via Point of Use Super-Ultralow-Pressure Reverse Osmosis and Cellulose-Polyamide Thin-Film Nanocomposite Membranes

IF 4.4 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Juan Luis Fajardo-Diaz, Armando David Martinez-Iniesta, Ayaka Yamanaka, Syogo Tejima, Kazou Izu, Shigero Saito, Jun Maeda, My Ali El Khakani, Winadda Wongwiriyapan, Feng Wang, Takuya Hayashi, Kenji Takeuchi, Rodolfo Cruz-Silva, Morinobu Endo
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Abstract

A novel thin-film nanocomposite reverse osmosis (RO) membrane was developed for point-of-use applications (POU-RO) at super-ultralow pressure (0.2 MPa), incorporating carboxymethylated cellulose nanofibers (CM-CNF). The CM-CNF with an increased number of oxygen-containing functional groups that positively impacts water flux, salt rejection stability, antifouling characteristics, and resistance to chlorine degradation compared to commercial RO-PA membranes. Transmission electron microscopy (TEM), combined with geodesic and skeletonized image analysis, revealed that the average thickness of the PA/CM-CNF membrane is 1050 nm corresponding to more than four leaf-like layers, significantly higher than commercial membranes, which typically show fewer than two layers. Moreover, a void-free active layer is created, providing excellent substrate coverage. Tests with CaCl2 at 0.2 MPa showed 93.9% salt rejection and a water permeation rate of 0.93 m/d, doubling the performance of commercial membranes. Dynamic simulations confirmed the influence of CM-CNF on enhancing water diffusion at low pressure (0.2 MPa). POU-RO tests, conducted using a 2-inch spiral module fabricated in the laboratory, confirmed the superior performance of the CM-CNF membrane. Indeed, high recovery rates (>60%) and high permeation rates (close to 0.7 m/d) have been achieved by the membranes. This performance is twice than the commercial counterparts tested at 0.2 MPa.

Abstract Image

利用超超低压反渗透和纤维素-聚酰胺薄膜纳米复合膜的先进制水技术
采用羧甲基化纤维素纳米纤维(CM-CNF),研制了一种新型薄膜纳米复合反渗透(RO)膜,用于超超低压(0.2 MPa)下的点对点应用(pouo -RO)。与商用RO-PA膜相比,CM-CNF具有更多的含氧官能团,对水通量、防盐稳定性、防污特性和抗氯降解具有积极影响。透射电子显微镜(TEM)结合测地和骨架图像分析显示,PA/CM-CNF膜的平均厚度为1050 nm,相当于4层以上的叶状层,明显高于通常少于2层的商用膜。此外,创建了无空隙的活性层,提供了出色的基板覆盖。在0.2 MPa的CaCl2条件下,膜的除盐率为93.9%,渗透率为0.93 m/d,是工业膜性能的两倍。动态模拟证实了CM-CNF在低压(0.2 MPa)下增强水扩散的作用。使用实验室制造的2英寸螺旋模块进行的pu - ro测试证实了CM-CNF膜的优越性能。事实上,该膜实现了高回收率(60%)和高渗透率(接近0.7 m/d)。该性能是在0.2 MPa下测试的商用同类产品的两倍。
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来源期刊
Advanced Materials Interfaces
Advanced Materials Interfaces CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
5.60%
发文量
1174
审稿时长
1.3 months
期刊介绍: Advanced Materials Interfaces publishes top-level research on interface technologies and effects. Considering any interface formed between solids, liquids, and gases, the journal ensures an interdisciplinary blend of physics, chemistry, materials science, and life sciences. Advanced Materials Interfaces was launched in 2014 and received an Impact Factor of 4.834 in 2018. The scope of Advanced Materials Interfaces is dedicated to interfaces and surfaces that play an essential role in virtually all materials and devices. Physics, chemistry, materials science and life sciences blend to encourage new, cross-pollinating ideas, which will drive forward our understanding of the processes at the interface. Advanced Materials Interfaces covers all topics in interface-related research: Oil / water separation, Applications of nanostructured materials, 2D materials and heterostructures, Surfaces and interfaces in organic electronic devices, Catalysis and membranes, Self-assembly and nanopatterned surfaces, Composite and coating materials, Biointerfaces for technical and medical applications. Advanced Materials Interfaces provides a forum for topics on surface and interface science with a wide choice of formats: Reviews, Full Papers, and Communications, as well as Progress Reports and Research News.
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