Abstract
The present work deals with the development of a novel biopolymeric flocculant towards the treatment of coal suspension. Amylopectin has been chosen as natural polysaccharide to be modified towards the treatment of coal effluent. The synthetic methodology follows two basic steps: at first, amylopectin has been modified to cationically substituted amylopectin (Cat-AM) and then polyacrylamide chains have been grafted with Cat-AM through free radical polymerization. The graft copolymer (Cat-AM-g-PAAm) has been characterized using various characterization techniques including Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance spectroscopy (1H-NMR), thermogravimetry (TGA), elemental analysis (CHN), field emission scanning electron microscopy (FESEM) analyses. Multiangle light scattering spectroscopy/gel permeation chromatography (MALSS/GPC) analysis reveals the gradual increase in average molecular weight from amylopectin to Cat-AM to Cat-AM-g-PAAm. The developed material demonstrates excellent efficacy towards the settling of coal suspension and even better as compare to a commercially available flocculant.
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