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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


Citation

Johari, Ili Syazana and Yusof, Nor Azah and Haron, Md. Jelas and Mohd Nor, Siti Mariam (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 (7). pp. 8461-8472. ISSN 1431-5157; ESSN: 1420-3049

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 × 10-1 g mg-1 min-1 at 25 °C. The Gibbs free energy, ΔG0, value is negative, indicating a spontaneous sorption process. Entropy, ΔS0, gives a positive value, indicating that the system is becoming increasingly disordered after the adsorption of copper ion. A positive enthalpy value, ΔH0, shows that the endothermic process takes place during the adsorption and is more favourable at high temperatures.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.3390/molecules18078461
Publisher: Multidisciplinary Digital Publishing Institute
Keywords: Copper; Isotherm; Kinetic; Poly(ethyl hydrazide).
Depositing User: Umikalthom Abdullah
Date Deposited: 03 Jul 2014 03:04
Last Modified: 05 Oct 2015 07:16
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/molecules18078461
URI: http://psasir.upm.edu.my/id/eprint/30160
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