Influence Of Pre-treatment Methods On The
Adsorption Of Cadmium Ions By Chestnut Shell
Author(s)
G. Vázquez, O. Mosquera, M. S. Freire, G. Antorrena
& J. González-Álvarez
Abstract
In this work the use of chestnut shell as an adsorbent of the cadmium ions
present in some industrial wastewaters was studied. Various pre-treatments were
performed to increase the sorption capacity of the material and simultaneously
avoid the coloration of the water due to soluble polyphenols. The effect of the
pre-treatments was evaluated using the pre-treated material to adsorb Cd2+ ions
under specified conditions. The influence of the pre-treatment agent (water,
sodium hydroxide, sulphuric acid, formaldehyde and sodium chloride) and of the
operating conditions (temperature and time) on the sorption capacity of the
pre-treated material was analysed using the pseudo-second order kinetic model.
Equilibrium sorption capacities from 2.50 to 7.11 mg Cd2+/g oven-dried shell
were achieved. The optimal results were obtained by pre-treating the shell with a
4% NaOH aqueous solution for 24 h at room temperature. Under these
conditions an adsorption percentage of 98.6% was obtained and 80% of the
maximum sorption capacity was reached in less than 1 h. X-ray photoelectron
spectrometry (XPS) surface measurements were performed to compare the
chemical composition of the pre-treated materials. Additionally, FTIR and XPS
were used to analyze the functional groups involved in Cd binding.
Keywords: chestnut shell, adsorption, cadmium ions, pre-treatment, kinetic
models, X-ray photoelectron spectrometry, Fourier transform infrared
spectroscopy.
Keywords
chestnut shell, adsorption, cadmium ions, pre-treatment, kinetic
models, X-ray photoelectron spectrometry, Fourier transform infrared
spectroscopy
Related Book
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