%0 Journal Article
%T 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
%A Ili Syazana Johari
%A Nor Azah Yusof
%A Md Jelas Haron
%A Siti Mariam Mohd Nor
%J Molecules
%D 2013
%I MDPI AG
%R 10.3390/molecules18078461
%X 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 ¡ãC 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 ¡ãC. A kinetic study showed that the adsorption of copper ion rapidly reaches equilibrium and follows a pseudo¨Csecond-order kinetic model, with a constant rate of 7.02 ¡Á 10 £¿4 g mg £¿1 min £¿1 at 25 ¡ãC. The Gibbs free energy, £¿G£¿, value is negative, indicating a spontaneous sorption process. Entropy, £¿S£¿, gives a positive value, indicating that the system is becoming increasingly disordered after the adsorption of copper ion. A positive enthalpy value, £¿H£¿, shows that the endothermic process takes place during the adsorption and is more favourable at high temperatures.
%K copper
%K poly(ethyl hydrazide)
%K isotherm
%K kinetic
%U http://www.mdpi.com/1420-3049/18/7/8461