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Title of Journal: Int J Environ Sci Technol

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Abbravation: International Journal of Environmental Science and Technology

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Springer Berlin Heidelberg

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DOI

10.1016/0005-2744(78)90091-8

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ISSN

1735-2630

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Preparation and characterization of gum karaya hyd

Authors: E FossoKankeu H Mittal F Waanders I O Ntwampe S S Ray
Publish Date: 2015/12/14
Volume: 13, Issue: 2, Pages: 711-724
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Abstract

This research paper reports the removal of heavy metal ions from mine effluents using the gum karaya GKgrafted polyacrylamidecoacrylic acid incorporated iron oxide magnetic nanoparticles Fe3O4 MNPs hydrogel nanocomposite ie GKclPAAmcoAA/Fe3O4 hydrogel nanocomposite and inorganic coagulants such as polyferric chloride afPFCl Al2SO43 FeCl3 and MgOH2 The Fe3O4 MNPs were incorporated in the matrix of the hydrogel polymer of GkclPAAmcoAA through the free radical graft copolymerization technique using NN′methylenebisacrylamide as the crosslinking agent The graft copolymerization of the PAAmcoAA with Gk and the successful incorporation of the Fe3O4 MNPs within the hydrogel polymer matrix was evidenced using different characterization techniques such as FTIR XRD SEM and TEM The performance of coagulants was evaluated by considering parameters such as turbidity removal pH correction metal removal and settling time It was observed that the monomeric inorganic coagulants had a relatively poor performance compared to the organic coagulant ie GKclPAAmcoAA/Fe3O4 hydrogel nanocomposite Most of the coagulants achieved maximum turbidity removal in the range of 67–995  but the hydrogel nanocomposite showed the greatest reactivity by achieving the fastest floc formation rate and shortest optimum sedimentation time of 5 min 100  removal in 5 min The removal of metal followed the order Pb2+  Cr6+  Ni2+ with an optimum settling time of 15 min more often Ni2+ was poorly removed ≤232  removal after 15 min from acidic mine water samples Therefore the synthesized hydrogel nanocomposite has shown great potential as a flocculant and adsorbent for the removal of suspended particles as well as heavy metal ions and can be used to improve the quality of mine effluents prior to discharge in the environmentThe authors are grateful to the sponsor from the NorthWest University and the National Research Foundation NRF in South Africa and the contribution of Mr N Lemmer of the Laboratory of Minerals Processing in the School of Chemical Engineering NorthWest University The authors are also grateful to the National Research Foundation NRF South Africa for awarding a postdoctoral research fellowship The authors also thank the University of Johannesburg the Department of Science and Technology and the Council for Scientific and Industrial Research for financial support

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