Abstract
Lyotropic liquid crystals phases are prepared from cationic surfactant (Cetylpyridinium chloride) in the aqueous medium. All the mixtures show well defined lamellar phases duly confirmed from X-ray diffraction and polarizing optical microscopy characterizations. Ionic conductivity of the lyotropic phases is ranging between 4.2 and 28.8 mS/cm and shows dependence on surfactant concentration. Further, lamellar mesostructures are dispersed with cationic dye (methyl blue). We noticed that bilayer mesostructures act as an excellent adsorbent to sequester the cationic dye in the aqueous medium. Dye sequestration is confirmed visually and spectroscopically via UV–Visible characterization. Lyotropic adsorbents are found highly reactive as they sequester 0.01 wt% methyl blue dye within 30 min. Sequestration efficiency of lyotropic adsorbents is ranging from 98.9 to 87.5% (for 0.01 wt% dye). Considering electrostatic interactions, dye sequestration mechanisms are established and discussed. Our findings suggested that lyotropic adsorbents can be explored as a highly effective, reactive and cost-effective alternative for sequestration/adsorption of contaminations.
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