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Water transport mechanisms during pressure-driven transport through polyamide nanogaps.
Phys Fluids (1994)
January 2025
Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7431, USA.
Molecular-scale simulations of pressure-driven transport through polyamide nanogaps (5-100 Å) were performed to investigate fundamental transport mechanisms. Results show that transport in nanogaps 10 Å is always subdiffusive, but superdiffusive transport was observed in nanogaps 20 Å. Near typical operating pressures for applications ( = 100 atm), only the 100 Å nanogap exhibited superdiffusive behavior.
View Article and Find Full Text PDFInterfacial Polymerization of Aromatic Polyamide Reverse Osmosis Membranes.
ACS Appl Mater Interfaces
November 2024
Department of Biomedical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States.
Polyamide membranes are widely used in reverse osmosis (RO) water treatment, yet the mechanism of interfacial polymerization during membrane formation is not fully understood. In this work, we perform atomistic molecular dynamics simulations to explore the cross-linking of trimesoyl chloride (TMC) and m-phenylenediamine (MPD) monomers at the aqueous-organic interface. Our studies show that the solution interface provides a function of "concentration and dispersion" of monomers for cross-linking.
View Article and Find Full Text PDFSelective-layer polysulfone membranes based on unfunctionalized and functionalized MoS/polyamide nanocomposite for water desalination.
Environ Sci Pollut Res Int
December 2024
Department of Chemistry, College of Science, King Saud University, P.O. Box 11495, Riyadh, Saudi Arabia.
Recently, reverse osmosis (RO) has become the most widely used process in membrane technology. It has aroused great interest in water desalination through membranes. According to recent studies, the surface properties of support layers in thin film membranes are crucial for improving reverse osmosis performance.
View Article and Find Full Text PDFIntroducing the SNW-1 Covalent Organic Framework to the Polyamide Layer of the TFC-RO Membrane with Enhanced Permeability and Desalination Performance.
ACS Appl Mater Interfaces
November 2024
Environmental Engineering Department, Istanbul Technical University, Maslak 34469, Istanbul, Turkey.
This study investigates the synthesis and characterization of Schiff base network-1 (SNW-1) covalent organic framework (COF) nanomaterials and their application in the fabrication of thin-film nanocomposite (TFN) membranes. The embedding of SNW-1 COF in reverse osmosis (RO) membranes with a polysulfone (PSf) substrate was done using the interfacial polymerization method. The result of the study demonstrated that the porous and hydrophilic structure of the COF increased the hydrophilic properties of the produced RO membranes.
View Article and Find Full Text PDFFouling of Reverse Osmosis (RO) and Nanofiltration (NF) Membranes by Low Molecular Weight Organic Compounds (LMWOCs), Part 1: Fundamentals and Mechanism.
Membranes (Basel)
October 2024
LG Chem Japan Co., Ltd., Kyobashi Trust Tower 12F, 2-1-3 Kyobashi Chuo-ku, Tokyo 104-0031, Japan.
Reverse osmosis (RO) and nanofiltration (NF) are ubiquitous technologies in modern water treatment, finding applications across various sectors. However, the availability of high-quality water suitable for RO/NF feed is diminishing due to droughts caused by global warming, increasing demand, and water pollution. As concerns grow over the depletion of precious freshwater resources, a global movement is gaining momentum to utilize previously overlooked or challenging water sources, collectively known as "marginal water".
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