Construction of PPSU-MoS2/PA-MIL-101(Cr) Membrane with Highly Enhanced Permeance and Stability for Organic Solvent Nanofiltration

Abstract

Membranes with excellent separation performance and stability are needed for organic solvent nanofiltration in industrial separation and purification processes. Here we reported a newly PPSU-MoS2/PA-MIL-101(Cr) composite membrane with high permeance, good selectivity and stability. The MIL-101(Cr) was introduced in the polyamide (PA) layer via the PIP/TMC interfacial polymerization process on a microporous PPSU-MoS2 substrate. At a small doping amount of 0.005 wt% MIL-101(Cr), the PPSU-MoS2/PA-MIL-101(Cr) composite membrane exhibited a high methanol permeance of 12.03 L m-2 h-1 bar-1, twice higher than that of the pristine membrane without sacrificing selectivity. Furthermore, embedding MIL-101(Cr) notably enhanced the stability of the composite membrane, with permeance only decreasing by 8% after a long time operation of 80 hours (pristine membrane decreased by 25%). This work demonstrated a composite membrane modified by MIL-101(Cr) with superior separation performance, which provides potential application of MOF materials for high-performance membranes in organic solvent nanofiltration and a theoretical foundation for future research in studying MOF’s influence on membrane properties.

Influence of PEG-PPG-PEG Block Copolymer Concentration and Coagulation Bath Temperature on the Structure Formation of Polyphenylsulfone Membranes

“…Significant efforts have been made to improve PPSU membrane properties: decrease water contact angle, and increase membrane permeability and antifouling performance [1,[7][8][9]. According to the literature review, PPSU was successfully applied by researchers to design membranes for ultrafiltration [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], organic solvent nanofiltration [21], pervaporation [22], and gas separation [23], as well as membrane support for thin-film composite membranes for nanofiltration [24][25][26][27], forward osmosis [28], and organic solvent nanofiltration [29]. PPSU membranes were studied in various applications including surface water treatment [19,26,30], oil/water separation [20], removal of heavy metals [4,16] and dyes from aqueous [17,18,24,27] and organic solvent [21,29] media, protein separation [31], removal of tetracycline…”

“…The most abundant approaches to PPSU membrane modification include chemical modification of the polymer (sulfonation [24,28], amination [34], chloromethylation [35]), introducing low molecular weight pore-forming additives (1,2-propylene glycol [9]), oligomers (oligoethylene glycol [3,4,7,8,13]), polymers (polyethylene glycol (PEG) [7][8][9]11], polyvinylpyrrolidone (PVP) [9,11,[14][15][16][17][18], polyetherimide [5], cellulose acetate [36], polysulfone [4,13], polyethersulfone [37], polyaniline [19]), surfactants (Tween 80) [9], and nanomaterials [2,11,[15][16][17][20][21][22]25,29] to the casting solution. The combination of different modification techniques can be often found in the literature: blending with PEG and dendritic fibrous nanosilica [12], PVP and nano-tin oxide (SnO 2 ) [17], polysulfone and oligoethylene glycol [4,13], oligoethylene glycol and graphene oxide [6], and oxidized multiwalled carbon nanotubes, PEG and PVP…”

Development of High Flux Nanocomposite Polyphenylsulfone/Oxidized Multiwalled Carbon Nanotubes Membranes for Ultrafiltration Using the Systems with Critical Solution Temperatures

“…It is known that PPSU features higher chemical resistance to alkaline cleaning and organic solvents, hydrolysis and operation temperature compared to polysulfone (PSf) and polyethersulfone (PES) [ 4 , 5 , 6 ]. These advantages result in using PPSU membranes in ultrafiltration [ 7 , 8 , 9 ], nanofiltration [ 10 , 11 , 12 , 13 ], forward osmosis [ 14 ], pervaporation [ 15 , 16 , 17 ], and gas separation [ 16 , 18 , 19 ], in membrane contactors [ 20 ] and proton exchange membrane fuel cells [ 21 ]. PPSU membranes were developed for water treatment [ 22 , 23 , 24 , 25 ], water desalination [ 14 , 26 ], for dye removal [ 3 , 21 , 27 , 28 , 29 ], oil in water separation [ 30 , 31 , 32 ], water purification from natural organic matter (NOM) [ 33 ], removal of heavy metal ions [ 10 , 34 ], CO 2 /CH 4 gas separation [ 18 ], removal of free fatty acid from crude palm oil [ 35 ], removal of kinetic hydrate inhibitor from water [ 36 , 37 ], the separation of biobutanol from ABE mixtures [ 5 ] and cumene from water via pervaporation [ 17 ].…”