Journal
CARBOHYDRATE POLYMERS
Volume 115, Issue -, Pages 617-628Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.09.026
Keywords
Gum ghatti; Hydrogel polymer; Graft co-polymerization; Biodegradation; Flocculation; Adsorption
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Funding
- National Research Foundation (NRF), South Africa
- Department of Science and Technology
- Council for Scientific and Industrial Research, South Africa
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This study reports the microwave-assisted synthesis of gum-ghatti (Gg)-grafted poly(acrylamide-co-methacrylic acid) (AAm-co-MAA) hydrogels for the development of biodegradable flocculants and adsorbents. The synthesized hydrogels were characterized using TGA, FUR and SEM. TGA studies revealed that the synthesized hydrogels were thermally more stable than pristine Gg and exhibited maximum swelling capacity of 1959% at 60 degrees C in neutral pH. The optimal Gg-cl-P(AAm-co-MAA) hydrogel was successfully employed for the removal of saline water from various petroleum fraction-saline emulsions. The maximum flocculation efficiency was achieved in an acidic clay suspension with a 15 mg polymer dose at 40 degrees C. Moreover, the synthesized hydrogel adsorbed 94% and 75% of Pb2+ and Cu2+, respectively, from aqueous solutions. Finally, the Gg-cl-P(AAm-co-MAA) hydrogel could be degraded completely within 50 days. In summary, the Gg-cl-P(AAm-co-MAA) hydrogel was demonstrated to have potential for use as flocculants and heavy metal absorbents for industrial waste water treatment. (C) 2014 Elsevier Ltd. All rights reserved.
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