Development of novel composite membranes using quaternized chitosan and Na+-MMT clay for the pervaporation dehydration of isopropanol

Preparation and pervaporation performance of chitosan-poly(methacrylic acid) polyelectrolyte complex membranes for dehydration of 1,4-dioxane

“…On the contrary, the selectivity was decreased exponentially with increasing the mass% of water in the feed. At higher concentration of water in the feed, small amount of water dissolves in the membrane, which in turn acts as a plasticizer for the membrane leading to more flexible polymeric chains in the matrix [39]. In addition, water being more polar than dioxane its absorption in the membrane weakens the ionic crosslinking resulting to a loose structure of the membrane.…”

Removal of cobalt(II) ion from aqueous solution by chitosan–montmorillonite

“…The calculated values of free ΔG, ΔH and ΔS were obtained according to the methods in other studies (Septhum et al, 2007;Choudhari and Kariduraganavar, 2009). The value of ΔH θ is positive (14.00 kJ/mol), suggesting that the adsorption of Co 2+ is endothermic.…”

Chitosan-Clay Bio-Nanocomposites

“…Barrier properties can be used for development of membranes. For instance, quaternized chitosan by reaction of chitosan with an excess of methyl iodide can be intercalated into Na-montmorillonite giving rise to different delamination degree as a function of the clay content [62]. These bio-nanocomposites conformed as films were tested as membranes for the pervaporation dehydration of isopropanol, showing that incorporation of montmorillonite results in the highest separation selectivity with a relatively high permeation flux [62].…”

“…For instance, quaternized chitosan by reaction of chitosan with an excess of methyl iodide can be intercalated into Na-montmorillonite giving rise to different delamination degree as a function of the clay content [62]. These bio-nanocomposites conformed as films were tested as membranes for the pervaporation dehydration of isopropanol, showing that incorporation of montmorillonite results in the highest separation selectivity with a relatively high permeation flux [62]. Incorporation of carbon nanotubes (CNTs) together with the clay component results in a synergistic reinforcement effect in the resulting ternary bio-nanocomposites [63] and produces a significant improvement in barrier properties towards benzene vapors, which can be of interest for future development of pervaporation membranes [64].…”