Facile Fabrication of Double-Network Nanocomposite Hydrogel Beads of Alginate/Polyacrylamide/Cellulose Nanocrystals with Enhanced Mechanical and Dye-Adsorption Performances
Vol. 59, No. 6, pp. 329-336,
Dec. 2022
10.12772/TSE.2022.59.329
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Abstract
Herein, double-network (DN) hydrogel beads of calcium alginate/polyacrylamide
(PAAm) were synthesized, and their dye adsorption and mechanical performances
were enhanced by incorporating cellulose nanocrystal (CNC). The DN hydrogel beads were
prepared via two-step procedures: free-radical polymerization of AAm in oil bath at 90 °C
and ionotropic crosslinking of alginate in calcium chloride solution. The nanocomposite
DN beads were fabricated at the CNC contents of 0.5-2 wt% with respect to the polymer
amount. Whereas CNC had insignificant effect on the bead structure, it significantly
improved both mechanical properties and dye adsorption capacity. Neat and nanocomposite
beads exhibited the diameter, weight, and water content of approximately 3.3 mm,
0.04 g, and 88%, respectively, irrespective of the CNC amount. In the dye adsorption,
whereas neat hydrogel beads exhibited 19.7% dye removal for the immersion time of 180
min, nanocomposite beads with 1.5 wt% CNC exhibited a 1.8-fold increased dye removal
efficiency (35.3%). In addition, nanocomposite beads with 1.0 wt% CNC exhibited 1.8- and
3.8-fold increased compressive modulus and strength (9.0 and 3.0 MPa) compared with
those of neat beads (4.9 and 0.8 MPa). Consequently, the DN hydrogel beads with the highest
performances were obtained at the CNC content of 1.0-1.5 wt%.
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