Investigation of Chitosan-PVA Composite Films and Their Adsorption Properties


Viscous aqueous solutions of chitosan and polyvinyl alcohol (PVA) were blended to enhance miscibility and avoid polymer phase separation. The mixtures were drop-casted and air dried to yield composite film materials that were characterized by equilibrium water uptake, physical stability in aqueous solution, and thermal stability. Chitosan/PVA blends have greater thermal stability, unique morphology, and reduced solubility in acidic solution, thus extending the useful pH range for chitosan as a sorbent material. The uptake properties of the films was investigated using methylene blue (MB) and a p-nitrophenol (PNP) dyes, where it was found that each single component polymer has greater uptake toward MB than PNP. A direct relationship between film composition (chitosan:PVA) with solution pH and the uptake of MB was observed. The results are in agreement with electrostatic interactions and contributions due to the hydrophobic effect for such composite materials.

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Casey, L. and Wilson, L. (2015) Investigation of Chitosan-PVA Composite Films and Their Adsorption Properties. Journal of Geoscience and Environment Protection, 3, 78-84. doi: 10.4236/gep.2015.32013.

Conflicts of Interest

The authors declare no conflicts of interest.


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