Abstract
Three cross-linked starch based polymers (1–3) were prepared by reaction between starch and hexamethylene diisocynate in the presence of dimethylformamide. The cross-linked adsorbents were used for the recovery of 4-nitrophenol (pNP) and 4-chlorophenol (pCIP) from aqueous solutions. Characterization of the polymers was performed by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy thermogravimetric analysis (TG) and differential thermal analysis (DTA). It was observed that the X-ray diffraction patterns of native starch and cross-linked starch were similar. TG-DTA studies revealed that the decomposition temperature of cross-linked starch was higher than that of native starch. The influence of pH, adsorbent dose and contact time on the percentage sorption capacity was examined using batch study. Adsorption results revealed that the starch-based bio-adsorbents showed high sorption capacity towards pNP and pCIP. At optimized conditions the maximum sorption capacity observed for polymer 3 was 83% for pNP. Substitution of experimental data values in the Freundlich model showed favourable results as compared with the Langmuir model.
Published Version
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