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Abstract: Novel flocculant based on amphoteric amylopectin for wastewater and industrial effluents treatment has been developed in authors’ laboratory. Amphoteric flocculants have anionic and cationic moieties on the same macromolecule and is used to remove both positively and negatively charged contaminant particles in suspensions. Amylopectin based flocculants have been found to be highly efficient flocculant and hence it has been chosen as base polysaccharide. By grafting of polyacrylamide and subsequent hydrolysis, anionic amylopectin has been synthesized. Afterwards, a cationic moiety has been inserted both by chemical/microwave processing. The flocculation efficiency of the amphoteric amylopectin has been tested in kaolin and iron ore suspensions. The results indicate its high efficiency in comparison with anionic, grafted, and base amylopectin. The amphoteric amylopectin prepared via microwave irradiation showed best flocculation efficiency. [Copyright &y& Elsevier]

The article discusses a study which examined the flocculation characteristics of polyacrylamide (PAM)-grafted chitosan. A ceric ammonium nitrate-induced solution polymerization technique was adopted by the study to synthesize PAM-grafted chitosan. Results of the study showed that the Chito-γ-PAM3 demonstrated the best settling performance in the samples. It was also found that better water clarifying performance was shown by the ungrafted chitosan compared to the PAM and grafted chitosan.

Presents information on a study which reviewed the details of synthesis, characterization and flocculation characteristics of grafted polysaccharides in treatment of synthetic as well as industrial effluents. Materials and methods; Results and discussion; Conclusion.

The synthesis of novel cationic flocculants based on amylopectin (AP), acrylamide (AM) and (3-acrylamidopropyl) trimethylammonium chloride (ATMAC) were done by free radical polymerization using ammonium persulphate (APS) as an initiator. Three different grades of novel cationic flocculants (AP- g -C 1 to AP- g -C 3) were synthesized by varying the proportion of acrylamide and (3-acrylamidopropyl) trimethylammonium chloride monomers. Through the hydrolysis of these flocculants, in presence of NaOH, three different grades of amphoteric polymers (AP-AT-C 1 to AP-AT-C 3) were synthesized. The synthesized polymers were characterized by various methods, namely, infrared spectroscopy, NMR spectroscopy, thermal analysis, viscosity measurement, scanning electron microscopy and X-ray diffractometry. The flocculation performance of AP- g -C and AP-AT-C were studied in kaolin suspension using jar test and settling test methods at neutral pH. Dye (Methylene blue) removal tests were performed using polymer beads and analysed by UV–vis spectroscopy. [ABSTRACT FROM AUTHOR]