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Molecules 2013, 18(7), 8461-8472; doi:10.3390/molecules18078461
Article

Preparation and Characterization of Poly(ethyl hydrazide)-Grafted Oil Palm Empty Fruit Bunch Fibre for the Removal of Cu(II) Ions from an Aqueous Environment

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Received: 1 March 2013; in revised form: 26 June 2013 / Accepted: 27 June 2013 / Published: 18 July 2013
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Abstract: Poly(ethyl hydrazide)-grafted oil palm empty fruit bunch fibre (peh-g-opefb) was successfully prepared by heating poly(methyl acrylate)-grafted opefb (pma-g-opefb) at 60 °C for 4 h with a solution of hydrazine hydrate (15% v/v) in ethanol. The Fourier transform infrared spectrum of the product shows a secondary amine peak at 3267 cm−1, with amide carbonyl peaks at 1729 cm−1 and 1643 cm−1. The chelating ability of peh-g-opefb was tested with copper ion in aqueous solution. A batch adsorption study revealed that maximum adsorption of copper ion was achieved at pH 5. An isotherm study showed the adsorption follows a Langmuir model, with a maximum adsorption capacity of 43.48 mg g−1 at 25 °C. A kinetic study showed that the adsorption of copper ion rapidly reaches equilibrium and follows a pseudo–second-order kinetic model, with a constant rate of 7.02 × 10−4 g mg−1 min−1 at 25 °C. The Gibbs free energy, ∆G⁰, value is negative, indicating a spontaneous sorption process. Entropy, ∆S⁰, gives a positive value, indicating that the system is becoming increasingly disordered after the adsorption of copper ion. A positive enthalpy value, ∆H⁰, shows that the endothermic process takes place during the adsorption and is more favourable at high temperatures.
Keywords: copper; poly(ethyl hydrazide); isotherm; kinetic copper; poly(ethyl hydrazide); isotherm; kinetic
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Johari, I.S.; Yusof, N.A.; Haron, M.J.; Nor, S.M.M. Preparation and Characterization of Poly(ethyl hydrazide)-Grafted Oil Palm Empty Fruit Bunch Fibre for the Removal of Cu(II) Ions from an Aqueous Environment. Molecules 2013, 18, 8461-8472.

AMA Style

Johari IS, Yusof NA, Haron MJ, Nor SMM. Preparation and Characterization of Poly(ethyl hydrazide)-Grafted Oil Palm Empty Fruit Bunch Fibre for the Removal of Cu(II) Ions from an Aqueous Environment. Molecules. 2013; 18(7):8461-8472.

Chicago/Turabian Style

Johari, Ili S.; Yusof, Nor A.; Haron, Md J.; Nor, Siti M.M. 2013. "Preparation and Characterization of Poly(ethyl hydrazide)-Grafted Oil Palm Empty Fruit Bunch Fibre for the Removal of Cu(II) Ions from an Aqueous Environment." Molecules 18, no. 7: 8461-8472.


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