Removal of heavy metals from aqueous solutions by starch-poly(AN) hydrogels

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Research Paper 01/04/2014
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Removal of heavy metals from aqueous solutions by starch-poly(AN) hydrogels

Mohammad Sadeghi, Esmat Mohammadinasab, Fatemeh Shafiei, Laleh Mansouri, Mohammad Javad Khodabakhshi
J. Bio. Env. Sci.4( 4), 271-275, April 2014.
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In this study, to following of synthesis of a superabsorbent hydrogel based on starch (St) and polyacrylonitrile (PAN), the removal of copper(II), zinc(II) and cadmium ions from aqueous solutions by H-St-g-polyAN hydrogel was investigated. The physical mixture of St and PAN was hydrolyzed by NaOH solution to yield St-poly(sodium acrylate-co-acrylamide) superabsorbent hydrogel.The various factors affecting the removal of heavy metal ions, such as treatment time with the solution and initial metal ions concentration were also investigated. The maximum removal of Cu(II) (76.0%) was observed at an optimum pH of 4.8, whereas, the maximum removal of 57.0% for Zn(II) and 49.0% for Cd(II) was observed.It was found that sorption of heavy metals occurs synchronously with the hydrogels swelling. The sorption capacity was high for copper 2.08 mmolg-1 at pH 6.


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