Crosslinked nanocomposite sodium alginate-based membranes with titanium dioxide for the dehydration of isopropanol by pervaporation

Premakshi, P. G.; Kariduraganavar, Mahadevappa Y.; Mitchell, Geoffrey

http://hdl.handle.net/10400.8/8398

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Authors

Premakshi, P. G.

Kariduraganavar, Mahadevappa Y.

Mitchell, Geoffrey

Abstract(s)

Sodium alginate (NaAlg) based membranes were prepared using a solution technique, crosslinked with poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-MA). Subsequently, the membranes were modified by the incorporation of 0, 10, 20, 30 and 40% w/w of titanium dioxide with respect to sodium alginate. The membranes thus obtained were designated as M, M-1, M-2, M-3 and M-4, respectively. An equilibrium swelling experiment was performed using dfferent compositions of the water and isopropanol mixtures. Subsequently, we used a pervaporation cell fitted with each membrane in order to evaluate the extent of the pervaporation dehydration of isopropanol. Among the membranes studied, the membranes containing 40 mass% of titanium dioxide exhibited the highest separation factor() of 24,092, with a flux(J) of 18.61x10-² kg/m².h at 30ºC for 10 mass%w/w of water in the feed. The total flux and the flux of water were found to overlap with each other, indicating that these membranes can be e ectively used to break the azeotropic point of water–isopropanol mixtures. The results clearly indicate that these nanocomposite membranes exhibit an excellent performance in the dehydration of isopropanol. The activation energy values obtained for the water permeation were significantly lower than those of the isopropanol permeation, underlining that these membranes have a high separation ability for the water isopropanol system. The estimated activation energies for total permeation (EP) and total di usion (ED) values ranged between 10.60 kJ.mol-¹ and 3.96 kJ.mol-¹, and 10.76 kJ.mol-¹ and 4.29 kJ.mol-¹, respectively. The negative change in the enthalpy values for all the membranes indicates that sorption was mainly dominated by Langmuir’s mode of sorption.

Description

The work of H.G. Premakshi and M.Y. Kariduraganavar was supported by the Department of Science & Technology, New Delhi, through the DST-PURSE-Phase-II program (Grant No. SR/PURSE PHASE-2/13 (G)). The work of GRM is supported by the Fundação para a Ciência e a Tecnologia (FCT) and Centro2020 through the project references: UID/Multi/04044/2019; PAMI-ROTEIRO/0328/2013 (No. 022158).

Keywords

Isopropanol Pervaporation Poly(styrene sulfonic acid-co-maleic acid) Sodium alginate Titanium dioxide

URI

http://hdl.handle.net/10400.8/8398

Citation

Premakshi, H. G., Kariduraganavar, M. Y., & Mitchell, G. R. (2020). Crosslinked nanocomposite sodium alginate-based membranes with titanium dioxide for the dehydration of isopropanol by pervaporation. Molecules, 25(6). https://doi.org/10.3390/molecules25061298