Journal ArticleDOI
Development, Characterization and Performance Evaluation of Positively-Charged Thin Film-Composite Nanofiltration Membrane Containing Fixed Quaternary Ammonium Moieties
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TLDR
In this article, a positively-charged thin film composite (TFC) type nanofiltration membranes, bearing fixed quaternary ammonium moieties, have been developed and studied and the effects of variation of chemical compositions and other experimental conditions such as curing temperature and duration of curing on the performances of the membrane were studied.Abstract:
Thin film composite (TFC) type positively-charged nanofiltration membranes, bearing fixed quaternary ammonium moieties, have been developed and studied. Branched polyethyleneimine (PEI) was functionalized by reaction with glycidyl trimethyl ammonium chloride (GTACl) to introduce quaternary ammonium chloride. Positively-charged TFC membranes were prepared by in situ interfacial polymerization of functionalized PEI and terephthaloyl chloride. The effects of variation of chemical compositions and other experimental conditions such as curing temperature and duration of curing on the performances of the membrane were studied. ATR FT-IR spectroscopy was done to establish the presence of charge-bearing groups in the membrane. The membranes were tested using single solute feed solutions of NaCl, Na2SO4, CaCl2, and MgSO4. Positive charges on the membranes were estimated in terms of their ion-exchange capacities (IEC). The values were also correlated to the solute-rejection properties of the membranes.read more
Citations
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Monovalent-ion-selective membranes for reverse electrodialysis
TL;DR: A relatively fast method is used to coat a standard commercial anion exchange membrane to improve its monovalent-ion selectivity, and the resulting membranes with their negatively charged coating showed increased hydrophilicity and exhibited sufficient antifouling potential against organic foulants.
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Positively charged nanofiltration (NF) membranes via UV grafting on sulfonated polyphenylenesulfone (sPPSU) for effective removal of textile dyes from wastewater
TL;DR: In this paper, a novel positively charged nanofiltration (NF) membranes have been fabricated using sulfonated polyphenylenesulfone (sPPSU) support with hydrophilic properties and fully sponge-like morphology via UV-induced grafting.
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Improved Antifouling Properties of Polyamide Nanofiltration Membranes by Reducing the Density of Surface Carboxyl Groups
TL;DR: It is demonstrated that a decrease in surface carboxyl group density of polyamide membranes fabricated with IPC monomers can prevent calcium bridging with alginate and, thus, improve membrane antifouling properties.
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Nanofiltration hollow fiber membranes for textile wastewater treatment: Lab-scale and pilot-scale studies
TL;DR: In this paper, the performance of polyamide-imide hollow fiber nanofiltration (NF) membrane in various operating conditions such as feed temperature, solute concentration, and pH was evaluated.
Journal ArticleDOI
Application of Positively Charged Composite Hollow-Fiber Nanofiltration Membranes for Dye Purification
TL;DR: A positively charged, composite, hollow-fiber nanofiltration (NF) membrane was fabricated by interfacial polymerization using polyethylenimine and trimesoyl chloride as reactive monomers.
References
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Composite reverse osmosis and nanofiltration membranes
TL;DR: A review of the field of thin film composite reverse osmosis membranes, with emphasis on the chemistry and composition of these membranes, is given in this article, with particular attention given to composite membranes that have found commercial use, whether in the present or past.
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Nanofiltration: Principles and Applications
TL;DR: The results show that nanofiltration in metal and acid recovery, as well as trace contaminant removal with Nanofiltration, is effective in both the food and chemical processing industries.
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Influence of ion size and charge in nanofiltration
TL;DR: In this paper, three commercial nanofiltration membranes were studied: two negatively charged (NF 40 and NTR 7450) and one positively charged (UTC 20) and the membrane pore radii were estimated using filtration experiments with uncharged solutes.
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Kinetics, thermodynamics and mechanism of reactions of epoxy oligomers with amines
TL;DR: In this paper, modern interpretations of the kinetics, thermodynamics and mechanisms of curing of epoxy oligomers with primary, secondary, and tertiary amines and their mixtures, as well as the structure of the resulting polymers are discussed.
Journal ArticleDOI
Nanofiltration extends the range of membrane filtration
TL;DR: Nanofiltration is a pressure driven membrane process between reverse osmosis and ultrafiltration for removal of color and TOC from Florida surface water, removal of hardness, radium, and sulfate from well water, and simultaneous removal of sodium chloride and concentration of organics with molecular weight 300–1000 in the food and pharmaceutical industries.