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Toxic Metal Ions Removal from Electroplating Wastewater Using Polymer Chelating Ligands

[ Vol. 17 , Issue. 5 ]

Author(s):

Md L. Rahman*, Mohd S. Sarjadi, Sazmal E. Arshad, Baba Musta, Mohd H. Abdullah, Shaheen M. Sarkar and Emmet J. O'Reilly   Pages 640 - 652 ( 13 )

Abstract:


Background: Empty fruit bunch (EFB) is a type of biomass waste product formed during the production process of palm oil. In the present work, EFB was used to prepare a cellulose-graft-copolymer which can be converted into poly(amidoxime)-poly(hydroxamic acid) ligands suitable for the removal of heavy metals from electroplating wastewater.

Methods and Results: Poly(amidoxime)-poly(hydroxamic acid) ligands were synthesized from the poly(acrylonitrile-co-methyl acrylate) grafted palm cellulose and were analyzed via FT-IR and FESEM. The binding capacity (qe) with the metals ions such as copper (Cu2+), iron (Fe3+), cobalt (Co2+), nickel (Ni2+) and lead (Pb2+) were 341, 290, 284, 204 and 482 mg g-1, respectively at pH 6. The pseudo-first-order kinetic model is fitted with the results confirming heavy metal adsorption. The isotherm study was conducted using a linear plot of the Langmuir isotherm where results were significantly different from the experimental value (maximum adsorption, qe), indicating that adsorption does not occur on a single layer. However, the coefficient of the correlation values obtained using the Freundlich isotherm model was acceptable (R2>0.99), and it was concluded that adsorption was multilayered with some metal ions.

Conclusion: The polymeric ligands synthesized here showed excellent adsorption of heavy metals from electroplating wastewater containing a notable amount of copper and iron metal ions.

Keywords:

Adsorption, amidoxime, electroplating wastewater, heavy metals, palm cellulose, Empty Fruit Bunch (EFB).

Affiliation:

Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 K.K., Sabah, Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 K.K., Sabah, Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 K.K., Sabah, Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 K.K., Sabah, Faculty of Science and Natural Resources, Universiti Malaysia Sabah, 88400 K.K., Sabah, Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick, Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick

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