Flocculation studies using amylose-grafted polyacrylamide

Evaluation of Some Starch Derivatives Containing Amide Groups as Flocculants

“…This phenomenon is in accordance with Karmaker [15] who found that the flocculation efficiency of poly(acrylamide)-amylose graft copolymer was better than that of polyacrylamide.…”

Spectroscopic investigation of the adsorption mechanisms of polyacrylamide polymers onto iron oxide particles

“…The use of polyacrylamides as flocculants in the water treatment and minerals processing industries [1][2][3][4][5][6][7], depressants [8][9][10], and dispersants [11] is rapidly increasing, and for efficient use requires a thorough understanding and identification of the adsorption mechanisms of polymers with differing functionality and molecular structure. In flocculation and dewatering applications, the efficacy of a given high-molecular-weight polymer is dependent upon its chemical structure characteristics and the mineral pulp chemistry.…”

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“…Among the grafted guar gum, xanthan gum, carboxy methyl cellulose, starch, amylase and amylopectin, it has been found that grafted amylopectin is the most efficient flocculant [5][6][7] Starch consists of linear amylose (molecular weight 10,000-60,000) and branched amylopectin (Mw = 50,000-10 7 g mol -1 ). Among all the polysaccharides, grafted amylopectin [6][7][8] has been found to have best flocculation. Graft copolymers are characterized [6] by viscometry, IR, NMR, thermal analysis, morphological study and XRD.…”

“…Graft copolymers are characterized [6] by viscometry, IR, NMR, thermal analysis, morphological study and XRD. Recently the proof of grafting has been given by enzyme hydrolysis [7]. Biodegradation can be followed by monitoring absolute viscosity at certain interval of times over entire period of the test at 30 °C when bacterial activity is maximum.…”

“…As mentioned earlier, the grafted polysaccharides are less prone to biological attack [8]. The standard jar test and settling tests were followed for measurement of flocculation and settling characteristics [5][6][7]. First the effectiveness as flocculant was measured in synthetic effluents of kaolin, PbNO 3 and coal.…”