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Supersorption Capacity of Anionic Dye by Newer Chitosan Hydrogel Capsules via Green Surfactant Exchange Method
journal contribution
posted on 2018-02-05, 00:00 authored by Sudipta Chatterjee, Hai Nguyen Tran, Ohemeng-Boahen Godfred, Seung Han WooChitosan-based
hydrogel beads were prepared through neutralization
with an alkali gelation process, whereas pristine hydrogel capsules
with a core–shell membrane structure were synthesized through
an anionic surfactant gelation process. The anionic surfactant (sodium
dodecyl sulfate; SDS) in the capsules was completely extracted through
a green exchange with an (NaOH) alkali solution. The extracted surfactant
solution can be continuously reused for synthesizing hydrogel capsules.
The effects of alkali treatment on the changes in the morphology,
surface chemistry, and adsorption capacity of the capsules were investigated.
The results indicated that the NaOH-treated capsules exhibited similar
chemical compositions but dissimilar structures to the pristine hydrogel
capsules. Optimal synthesis conditions of the green capsules (SN5)
were obtained at 5 g/L of SDS gelation and 0.02 N NaOH. Moreover,
the mechanical stability of hydrogel capsules was insignificantly
changed by the alkali treatment as evidenced by their mass loss under
ultrasonication. The alkali treatment process can remarkably enhance
the adsorption rate and capacity of Congo red dye onto the capsules.
The treated capsules (2592 mg/g) exhibited an excellent adsorption
capacity compared to the pristine hydrogel capsules (563 mg/g) and
beads (183 mg/g) because of the rearrangement of polymeric networks
after the alkali treatment process. The alkali treatment process can
significantly improve the adsorption capacity of capsules and completely
remove the SDS surfactant in capsules. Therefore, NaOH-treated hydrogel
capsules can serve as a biocompatible and green adsorbent with excellent
adsorption capacity.
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sodium dodecyl sulfateOptimal synthesis conditionsadsorption capacityalkali treatment processSNNaOH-treated hydrogel capsulesalkali gelation processhydrogel capsulesGreen Surfactant Exchange Method Chitosan-based hydrogel beadssurfactant gelation processsynthesizing hydrogel capsulesChitosan Hydrogel Capsules0.02 N NaOHSDSalkali treatment
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