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Comparative studies of chitosan and its nanoparticles for the adsorption efficiency of various dyes
A Shajahan1, S Shankar2, A Sathiyaseelan2
1Centre for Advanced Studies in Botany, University of Madras, Guindy Campus, Chennai, 600025, India; Entomology Research Institute, Loyola College, Chennai, 600034, India.
Abstract:
Chitosan has been considered as a chelating agent with the potential for the adsorption of dyes, metal ions and proteins. This study was aimed to prepare and characterize different fungal chitosan nanoparticles (FCI-1 to FCI-6 NPs) by ionic gelation method and to evaluate its efficacy on the sorption of various commercial dyes. Morphological observations showed that the FCI-1 is nearly spherical in shape with particle size ranging from 2 to 30nm, as determined by electron microscopic studies. Electron micrograph revealed that FCI-1 NPs were stable even after eighteen months of storage at 4°C. Adsorption efficiencies of FCI-1 NPs and FCI-1 were estimated against various dyes such as RBB, MO, DR, NBB and CSB using spectrophotometry. Out of the dyes tested, FCI-1 NPs showed better adsorption efficiency for CSB whereas only RBB followed Langmuir isotherm. The adsorption of remaining dyes may probably be through random adsorption. The results indicated that FCI-1 NPs could be used as efficient sorbents in treating industrial dye effluents.
