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2012, Separation and Purification Technology
Journal of Membrane Science
Mechanistic interpretation of solute permeation through a fully aromatic polyamide reverse osmosis membrane1997 •
2014 •
Journal of Applied Polymer Science
Oxidative degradation of polyamide reverse osmosis membranes: Studies of molecular model compounds and selected membranes2003 •
Selected aromatic amides were used to model the chemical reactivity of aromatic polyamides found in thin-film composite reverse osmosis (RO) membranes. Chlorination and possible amide bond cleavage of aromatic amides upon exposure to aqueous chlorine, which can lead to membrane failure, were investigated. Correlations are made of the available chlorine concentration, pH, and exposure time with chemical changes in the model compounds. From the observed reactivity trends, insights are obtained into the mechanism of RO membrane performance loss upon chlorine exposure. Two chemical pathways for degradation are shown, one at constant pH and another that is pH-history dependent. An alternative strategy is presented for the design of chlorine-resistant RO membranes, and an initial performance study of RO membranes incorporating this strategy is reported. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1173–1184, 2003
Journal of Applied Polymer Science
Enhanced transport properties of reverse osmosis membranes by chemical treatment1996 •
Environmental Science & Technology
Degradation of Polyamide Nanofiltration and Reverse Osmosis Membranes by Hypochlorite2012 •
Journal of Applied Polymer Science
A study of reverse osmosis separation and permeation rate for sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) membranes in different cationic forms1994 •
2003 •
The electron spin resonance technique (ESR) was used to study the structure and transport of asymmetric aromatic polyamide membranes. TEMPO (2,2,6,6-tetramethyl-1-piperridinyloxy free radical) was used as a spin probe that was brought into the membrane either by (a) immersion ofthe membranes in aqueous TEMPO solutions, (b) reverse osmosis (RO) experiments with feed solutions involving TEMPO or (c) blending TEMPO in casting solutions. The membranes were further tested for the separation of sodium chloride and TEMPO from water by RO. It was concluded that aromatic polyamide membranes contain water channels in the polymer matrix like cellulose acetate membranes. The presence of such water channels allows aromatic polyamide membranes to be used as RO membranes. The diffusion of organic solutes through the water channels seems much slower in aromatic polyamide membranes than in cellular acetate membranes, which probably causes a higher separation of organic solutes by aromatic polyamide membranes than cellulose acetate membranes. A comparison was made with other RO membranes (cellulose acetate, CA) and ultrafiltration membranes (polyethersulphone, PES). It was observed that the ESR technique can be used to study the structure of OF and RO membranes. The presence of water channels in the polymer matrix seems indispensable for the RO membrane.
Industrial & Engineering Chemistry Research
Structural Characterization of Thin-Film Polyamide Reverse Osmosis Membranes2014 •
Acta Cardiologica Sinica
A Rare Case of Buerger's Disease Successfully Treated by Rotarex Mechanical Thrombectomy in Bilateral Lower Extremities2021 •
Biological Conservation
The 10 Australian ecosystems most vulnerable to tipping points2011 •
Pesticide Formulation and Delivery Systems: 32<sup>nd</sup>Volume, Innovating Legacy Products for New Uses
Spray Droplet Size Affects Efficacy of Fenpropathrin Against Asian Citrus Psyllid2012 •
Rey Castelao, Ofelia; Cebreiro Ares, Francisco (coords.) Los caminos de la Historia Moderna: Presente y porvenir de la investigación. Santiago de Compostela: Universidade de Santiago de Compostela, 2023, pp. 201-08.
Hacia la reconstrucción de una biblioteca nobiliaria del Madrid del siglo XVII: los 54 libros extraviados de William Godolphin2023 •
2018 •
2004 •
SSRN Electronic Journal
Homo Æqualis: A Cross-Society Experimental Analysis of Three Bargaining Games2009 •
Journal of Dharma Studies
Unveiling Abhijñānaśākuntala: Exploring Kingship, Love, and Asceticism2024 •
Journal of Power Sources
Electrochemistry of thin-plate lead-carbon batteries employing alternative current collectors2017 •