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Nanofiltration‐like forward osmosis membranes on in‐situ mussel‐modified polyvinylidene fluoride porous substrate for efficient salt/dye separation
Author(s) -
Hu YiNing,
Li QiaoMei,
Guo YanFeng,
Zhu LiJing,
Zeng ZhiXiang,
Xiong Zhu
Publication year - 2021
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20210138
Subject(s) - polyvinylidene fluoride , nanofiltration , membrane , interfacial polymerization , chemical engineering , malachite green , thin film composite membrane , polyamide , forward osmosis , chromatography , substrate (aquarium) , materials science , solvent , reverse osmosis , chemistry , polymer chemistry , polymer , monomer , adsorption , organic chemistry , composite material , engineering , geology , biochemistry , oceanography
Here, polyvinylidene fluoride (PVDF) membranes were fabricated via non‐solvent induced phase separation (NIPS) using dopamine (DA) and polyethyleneimine (PEI) as the hydrophilic additives, which has a loose surface and somewhat improved hydrophilicity. Then nanofiltration (NF)‐like thin‐film composite forward osmosis (TFC FO) membrane with a loose polyamide (PA) active layer on the blend membrane was synthesized via the interfacial polymerization. The as‐prepared NF‐like TFC FO membrane exhibited a high water flux ( J w ) of 29.98 L m −2 h −1 and a much low specific salt flux ( J s /J w ) of 0.018 g/L, when 0.6 M NaCl was used as draw solution (DS). It had a superior rejection of malachite green (99.6% ± 0.1%) and a low rejection of NaCl (27.4% ± 4.2%), when filtrated malachite green/NaCl mixture solution in active layer‐facing draw solution (AL‐FS) mode. The results provide new insights on the design and preparation of FO membranes of selective separation for dyes from salty water.