Abstract
Nanofiltration (NF) is a separation technology with broad application prospects. Membrane fouling is an important bottleneck-restricting technology development. In the past, we prepared a positively charged polyethyleneimine/trimesic acid (PEI/TMA) NF membrane with excellent performance. Inevitably, it also faces poor resistance to protein contamination. Improving the antifouling ability of the PEI/TMA membrane can be achieved by considering the hydrophilicity and chargeability of the membrane surface. In this work, sodium chloroacetate (ClCH2COONa) is used as a modifier and is grafted onto the membrane surface. Additionally, 0.5% ClCH2COONa and 10 h modification time are the best conditions. Compared with the original membrane (M0, 17.2 L m−2 h−1), the initial flux of the modified membrane (M0-e, 30 L m−2 h−1) was effectively increased. After filtering the bovine albumin (BSA) solution, the original membrane flux dropped by 47% and the modified membrane dropped by 6.2%. The modification greatly improved the antipollution performance of the PEI/TMA membrane.
Highlights
Nanofiltration (NF) membranes have seen huge developments in the past few decades [1,2,3,4]
The best performance could be achieved after modification with 0.5% sodium chloroaceFtaigteurfeo7r7..1A0Anhnti,tpiaponlolldulutittohinoentgetsretes(at(ta(e)(,raC)d,leCglHCr2eHCeO2oCOfONmOaoNcdoainfcicoceanntctieroannttirohantaiiorndnfllyuineflwnucoer;nk(cbee)d;,dymimfiocodartieifioc(naStIi,omFneigtiumree iSn6ffll)u. ence) with BSA solution
The polyethyleneimine/trimesic acid (PEI/TMA) membrane was modified by ClCH2COONa through charge action
Summary
Nanofiltration (NF) membranes have seen huge developments in the past few decades [1,2,3,4]. The membrane structure can be symmetrical or asymmetrical. As an advanced separation technology, the treatment effect of NF membranes is excellent, but some aspects still need improvement. The problem of membrane fouling in some complex systems is a concern of many researchers [9,10,11,12]. The resulting composite membrane showed great antibacterial and antifouling performance [14]. Membrane fouling will reduce the permeate flux and worsen the effluent quality. The cost of process operation will increase substantially as a result, which greatly limits the application of NF membranes. Some chemical cleaning methods can be used to solve the problem of membrane fouling, it will inevitably increase operating costs and reduce work efficiency. The membrane structure may be damaged and reduce the service life
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