Synthesis and characterization of carbon nanotubes/poly vinyl alcohol nanocomposite membranes for dehydration of isopropanol

Multilayer mixed matrix membranes containing modified-MWCNTs for dehydration of alcohol by pervaporation process

“…Therefore, the results of the swelling test are in good agreement with the results of ATR-FTIR and SEM analysis. Similar results were reported in literature [24,28]. For example, Shirazi et al [28] observed that the presence of CNTs in the PVA membranes leads to higher crosslinking density and reduces the degree of swelling.…”

“…Similar results were reported in literature [24,28]. For example, Shirazi et al [28] observed that the presence of CNTs in the PVA membranes leads to higher crosslinking density and reduces the degree of swelling. Also, Sairam et al [24] reported that incorporation of TiO 2 nanoparticles into the PVA membrane results in lower swelling of the membrane.…”

“…Thus the ratio of water to ethanol partial fluxes and the separation factor enhance. Similar results have been reported in the literature [17,27,28]. For example, Shirazi et al [28] prepared PVA-CNT nanocomposite membranes for dehydration of isopropanol aqueous solutions and observed that incorporating CNTs in the PVA matrix significantly increases water separation factor due to rigidification of the polymer chains.…”

“…Furthermore, several inorganic compounds have been used as filler in the synthesis of the mixed matrix membranes for solvent dehydration by the pervaporation process. For example, zeolite [5][6][7]17,18,23], titanium oxide (TiO 2 ) [24,25], iron [22], sodium montmorillonite clay [26], carbon nanotubes (CNTs) [27][28][29] and silica [30]. There are some drawbacks in the preparation of mixed matrix membranes such as poor distribution of the filler in the polymer matrix and weak contact of inorganic filler particles in the polymer matrix.…”

Development of novel grafted hybrid PVA membranes using glycidyltrimethylammonium chloride for pervaporation separation of water–isopropanol mixtures

“…Unfortunately, it poses some drawbacks; mainly they are trade-off between permeability and selectivity; and swelling in aqueous solution [14,15]. To circumvent these and to improve its overall PV performance, PVA has been subjected for modifications through crosslinking, filling, blending and grafting [16][17][18][19][20].…”