Abstract
Although a great progress has been achieved for the development of NF membranes and technologies and SRNF do show a great potential in the separation of organic components, an NF membrane with good separation performance and good resistance to organic solvents are urgently needed for a more complicated situation in practical. In this study, a kind of solvent-resistant nanofiltration (SRNF) membrane was fabricated via interfacial polymerization on a laboratory optimized cellulose acetate (CA) basic membrane. The effects of interfacial polymerization parameters, such as water phase concentration, immersed time in the water phase and in the organic phase, on the pure water flux and rejection rate of C-2R yellow dyestuffs were investigated. A highest dye rejection rate of 72.9% could be obtained by water phase solution containing 1% m-xylylenediamine (mXDA) and organic phase solution with 0.2% trimesoyl chloride (TMC) under immersed time in water phase of 6 minutes and in organic phase of 40 seconds. This membrane demonstrated better resistance to methyl alcohol compared to commercial membrane. This study may offer an avenue to develop a solvent-resistant nanofiltration membrane.
Highlights
A kind of solvent-resistant nanofiltration (SRNF) membrane was fabricated via interfacial polymerization on a laboratory optimized cellulose acetate (CA) basic membrane
Membrane 4, containing 15% acetic acid fiber, 400 ml DMF and 1% PEG4000, was selected as the basic membrane for further interfacial polymerization, as it resulted in the high selectivity of bovine serum albumin (BSA), appropriate porosity and an acceptable pure water flux
The laboratory optimized cellulose acetate basic membrane was obtained by homogeneous experiment and it has a rejection rate of 39.97% towards 100 mg/L BSA
Summary
Traditional membrane processes are driven by the transmembrane pressure, which generally include microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO). NF membrane with a molecular weight cut-off of 350 - 1000 Da [1] is regarded as a separation process between UF and RO. There is a huge demand for NF membranes with excellent performance in some industries or processes like wastewater treatment [3], food processing [4], desalination [5] and removal of heavy metals [6]
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