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Showing 1 to 11 of 11 for “"Solute rejection"”.
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Modeling Nanofiltration Separation Mechanisms in Covalent Organic Framework Membranes
Solute transport in nanofiltration (NF) membrane systems is described with the Donnan Steric Pore Model with Dielectric Exclusion (DSPM-DE), which couples size- and charge-based solute partitioning mechanisms into and out of membrane pores with flow through pores, as described by the Extended …
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A Mechanistic Study of Arsenic (Iii) Rejection by Reverse Osmosis and Nanofiltration Membranes
… precursors) in a single treatment step. However, solute rejection mechanisms by RO/NF membranes are not well understood. The lack of mechanistic information arises from experimental difficulties faced when evaluating water/solute transport phenomena within the ultrathin membrane active layers …
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Nanofiltration membranes modified with aromatic polyamide dendrimers active layers
… TFC-S membrane is evaluated on the basis of rejection abilities of a variety of water contaminants having a range of sizes and chemistry. As the water flux is inversely proportional to the thickness of the active layer, we optimize the amount of dendrimers deposited for specific contaminants …
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Interfacially polymerized thin film composite membranes on microporous polypropylene supports for reverse osmosis desalination
… IP. Pressure dependences of the solvent flux and solute rejection of the TFC membranes were studied using the modified flat sheet membranes up to a pressure of 650-850 KPa. The TFC membranes were characterized by reverse osmosis based removal of sodium chloride (MW 58.44) in water. A rejection …
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Modeling nanofiltration for large scale desalination applications
… rate and pressure affect the recovery ratio and solute rejection across the membrane. A comparison is made between the results for the flat-sheet and spiral-wound configurations. The comparison showed that for the spiral-wound leaf, the maximum values of transmembrane pressure, flux and velocity …
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Nanoporous monolayer graphene membranes for water purification : from concept to realization
… for ultra-fast water permeance and high solute rejection as the atomic thinness provides little resistance to flow yet sterically hinders the transport of solutes larger than the pores. The resulting two-dimensional, nanoporous membrane is predicted to exhibit orders-of-magnitude …
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Effects of transmembrane hydraulic pressure on the performance of forward osmosis membranes, The
… on water flux, reverse salt flux, inorganic ion rejection, and bidirectional solute flux. An organic feed solution in conjunction with NaCl draw solution were also used to investigate changes in membrane rejection of organic molecules. Results from this study revealed that transmembrane pressure …
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Development and physicochemical characterization of thin-film composite nanofiltration membranes with covalent organic framework active layers
… RO membranes limits the water permeability and solute selectivity that could be achieved. In contrast, covalent organic frameworks (COFs) are an emerging class of materials that offer exceptional opportunities to overcome these challenges. COFs are constructed from modular building blocks to …
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Design and fabrication of asymmetric nanopores using pulsed PECVD
… was compared to both ALD and PVD. Flux and solute rejection measurements demonstrate that the pulsed PECVD-modified TE membranes exhibit higher selectivity without compromising on the flux due to their asymmetric structure. For example, the TiO2 modified supports were demonstrated to deliver …
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Development and characterization of dendrimeric NF/RO polyamide membranes
Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2014-01-24T14:14:50Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Martinez Saenz de Jubera_Ana.docx: 9222947 bytes, checksum: 443ea8b453c942240f8efa7f833c1a02 (MD5) Martinez Saenz de …
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Control of size and charge selectivity in amphiphilic graft copolymer nanofiltration membranes
… osmosis membranes, which have comprehensive solute rejection and low solvent permeability, and porous sieving ultrafiltration membranes. However, challenges in NF membrane design remain outstanding. At the effective pore size of NF membranes (~0.5 nm-2 nm), both electrostatic and steric …