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• W1964594968 abstract "Most nanofiltration membranes are composite and have a polyamide thin film prepared by interfacial polymerization. Their characteristics and performance are mainly determined by the thin film and consequently by the monomers used for its preparation. In this work, different thin films were prepared with small structural differences to help understanding how the amines structure influences the membranes nanofiltration performance, surface charge and morphology. Composite membranes were prepared by interfacial polymerization of piperazine (PIP), N,N′-diaminopiperazine (DAP), 1,4-bis(3-aminopropyl)-piperazine (DAPP) and N-(2-aminoethyl)-piperazine (EAP) with trimesoylchloride (TMC) separately. Their nanofiltration performance was evaluated with solutions of NaCl, MgSO4 and Na2SO4 (3 g/l and pH 6) at 10 × 105 Pa. The surface charge was investigated by zeta-potential measurements and the morphological studies by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The average water permeability of the samples was correlated with hydrophobic/hydrophilic character of the monomers by use of the octanol–water partition coefficient. At pH 6 the membranes from PIP, DAP and EAP presented the following order of rejection NaCl < MgSO4 < Na2SO4 characteristic of negatively charged membranes. The rejection order of the DAPP–TMC membrane was Na2SO4 < NaCl < MgSO4 since it was positively charged at pH 6. The membranes surfaces were in general flat except for the PIP–TMC membrane which had higher roughness. The DAP– and EAP–TMC presented an extremely thin film, undetectable by SEM analysis of the membranes cross-section." @default.
• W1964594968 created "2016-06-24" @default.
• W1964594968 creator A5028901288 @default.
• W1964594968 creator A5073197434 @default.
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• W1964594968 date "2006-08-01" @default.
• W1964594968 modified "2023-10-16" @default.
• W1964594968 title "Influence of the diamine structure on the nanofiltration performance, surface morphology and surface charge of the composite polyamide membranes" @default.
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• W1964594968 doi "https://doi.org/10.1016/j.memsci.2005.12.014" @default.
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