Journal
CHEMICAL ENGINEERING JOURNAL
Volume 420, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129338
Keywords
Organic solvent nanofiltration; Thin-film composite membrane; Polyaniline; Hydrolyzed polyacrylonitrile; In-situ growth
Categories
Funding
- National Natural Science Foundation of China [21776205]
- Natural Science Foundation of Tianjin City [19JCYBJC20900]
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A double-layered polyaniline composite organic solvent nanofiltration membrane was developed through in-situ polymerization, optimizing its separation performance and demonstrating excellent performance under various solvent conditions.
The trade-off between permeability and rejection limits the widespread application of organic solvent nanofiltration (OSN) membrane. As a promising membrane materials, polyaniline (PANI) has drawn increasing attention owing to its easy synthesis and excellent chemical stability. Nowadays, the reported PANI-based OSN membranes were fabricated by phase inversion process together with chemical crosslinking treatment. In this work, a novel double-layered polyaniline (PANI) composite OSN membrane was firstly developed through in-situ polymerization of aniline onto hydrolyzed polyacrylonitrile (HPAN) porous substrate. The separation performances of PANI/HPAN composite membrane were optimized by varying aniline concentration, polymerization time and oxidant:aniline ratio. The double-layered PANI/HPAN composite membrane prepared with 0.2 M aniline, 1 h polymerization and 1:4 oxidant:aniline ratio displayed ethanol permeance of 14.9 L.m(-2).h(-1).bar(-1) and rose bengal rejection of 98.1%. The membrane performance with the solvents including methanol, isopmpanol, 1-butanol, acetone, n-hexane, and toluene were also tested, showing a molecular weight cut-off (MWCO) of 500 similar to 600 g.mol(-1). In addition, the double-layered PANI/HPAN composite membrane maintained excellent and stable performance under strong acid soaking, ultrasonic vibration and continuous filtration
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