Synthesis and characterization of cross linked chitin/bentonite polymer blend and adsorption studies of Cu (II) and Cr (VI) on chitin

Saravanan D; Hemalatha R; Sudha P N

Abstract

Synthesis and characterization of cross linked chitin/bentonite polymer blend and adsorption studies of Cu (II) and Cr (VI) on chitin

Author(s): Saravanan D, Hemalatha R, and Sudha P N

Mixing of two or more polymers to produce blends is a well established strategy for achieving specific combination of physical properties. Polymer blend films of chitin and bentonite were prepared from homogeneous solutions in trichloroacetic acid at various ratios of chitin and bentonite. The cross linking agent glutaraldehyde was incorporated into the polymer blends to improve the properties such as surface hardness, stiffness, resistance to temperature and solvent attack. FTIR study revealed that there is intermolecular molecular hydrogen bonding interaction between the two polymer components. XRD studies shows that the films to exhibit an amorphous character. Glass transition temperature and the crystallization of the polymer blends were investigated on the basis of studies differential scanning calorimetry (DSC). By TGA and DTG experiments, enhancement in the thermal stability of polymer blend in presence of cross linking agent (glutaraldehyde) was found out. Adsorption of Cu (II) and Cr (VI) on chitin was studied by the Longmuir and Freundlich method. The influence of dosage of adsorbent, contact time & pH were experimentally verified. The results revealed that the adsorption of Cu (II) and Cr (VI) on chitin is spontaneous, endothermic and favorable. This blended polymer was used as an adsorbent in dye effluent treatment.

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