Volume No. 6 Issue No.: 1 Page No.: 26-33 July-Sept 2011

 

ADSORPTION THERMODYNAMICS OF CU(II) IONS FROM WASTE WATER USING NEEM-LEAF BASED BIOSORBENTS

 

V. S. Sethu*, Y. L. Kua, W. S. Quek, K.V. Lim1 and J. M. Andresen2

1. Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, Selangor (MALAYSIA)
2. Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham (UNITED KINGDOM)

 

Received on : April 29, 2011

 

ABSTRACT

 

Adsorption of Cu(II) ions onto a non-conventional plant biosorbent, Neem (Azadirachta indica) Leaf Powder (NLP), was investigated in batch adsorption experiments. Process parameters which include initial metal ion concentration and temperature of solution were varied in order to evaluate their influence on the adsorption process. The pH and NLP dosage were kept constant for the all experiments carried out. Results obtained indicate a spontaneous and endothermic adsorption which favours the adsorbate concentration of 500 mg/L at an optimum temperature of 333 K with a residence time of 60 to 90 min. At this optimal condition, the maximum adsorption capacity was found to be 446.5 mg Cu(II)/g NLP. The surface area of NLP is about 2.3102 m2/g, signifying an occurrence of chemisorption and ion exchange of Cu(II) ions on functional groups. Besides that, the adsorption of Cu(II) ions on NLP was found to fit Freundlich isotherm while following a pseudo-second order model. The study shows that NLP is a highly efficient biosorbent for adsorbing Cu(II) ions. The technology is promising and may be developed further for the removal of other heavy metals from wastewater.

 

Keywords : Neem leaves, Cu(II) ions, Wastewater treatment, Heavy metals, Biosorption

 

 

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