Author/Authors :
Al-Mamun ، M. نويسنده Department of Animal Sciences, Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan. , , Poostforush، M. نويسنده MS degree in Polymer Engineering, in 2009, from the Islamic Azad University, South Tehran Branch, in Iran. , , Mukul، S.A. نويسنده hD degree student at the University of Queensland , , Parvez، K. نويسنده he is a PhD degree student in the Max Planck Institute for Polymer Research, Germany. , , Subhan، A. نويسنده Professor of Chemistry at Shah Jalal University of Science and Technology, Sylhet, Bangladesh ,
Abstract :
The biosorption capability of Acacia (Acacia auriculiformis A.Cunn. ex
Benth.) leaf powder in batch and a small scale column was investigated. The adsorption
properties were analyzed with di erent experimental variables, such as solution pH, amount
of biosorbent, initial As(III) concentration and temperature. The maximum adsorption was
observed at pH 6.0, while the equilibrium was attained in 5 h. Langmuir and Freundlich
equilibrium adsorption isotherm models were utilized for tting the experimental data. The
maximum adsorption capacity of A. auriculiformis leaf powder was calculated to be 41.410
g g??1. The kinetic data were well tted using a pseudo- rst-order model with a correlation
coecient greater than 0.989. The surface morphology of the biosorbent was analyzed using
Scanning Electron Microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) was
employed to characterize the surface functional groups of A. auriculiformis leaf powder.
The activation energy (Ea) and heat of biosorption (H) were calculated to be 27.549
and 43.380 kJ mol??1, respectively. The thermodynamic parameters, such as Gibbs free
energy (G), enthalpy (H), and entropy (S), revealed the spontaneous nature of the
biosorption followed by a physical activated process. Small Scale Column Tests (SSCT)
were also conducted to discover the breakthrough characteristics of the column packed with
biosorbent.
