Nanofiltration membranes are widely used for two features: first, they have intermediate molecular weight cut-offs (MWCO) between those of reverse-osmosis and ultrafiltration membranes; the MWCOs range from 200 to 2000; second, most of the nanofiltration membranes are charged due to their materials, thus they have some rejection to electrolytes because of the Donnan effect.
The dyestuff always contains much salt in the produce process .Because the molecular weights of dye are usually ...
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