Abstract
BackgroundRemoval of suspended kaolin at low concentration (0.25 wt.%) is tedious hence not investigated at random. An architecturally decorated semi-synthetic flocculant derived from Xanthan gum or XG, has been synthesized and specifically used to unsettle the stable kaolin suspension with high efficiency. MethodsHyperbranched Polyacrylamide or HBPAM was grafted onto XG following Strathclyde method whereby the extent of hyperbranching of PAM was controlled by the molar ratios of brancher (methylene-bis-acrylamide or MBA) to chain transfer agent (dodecane thiol or DDT). The chemical structure was established through various analytical characterization. Significant findingsIt was evident that the copolymer with maximum extent of branching (70.5%, designated as H3) exhibited fastest settling time as well as lowest turbidity simultaneously, especially at pH 7 (58 secs, 70 NTU) and at the isoelectric point (pH 4, 76 secs, 30 NTU) as compared to other hyperbranched and linear grafts of XG.
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