Preparation and characterization of biosorbents and copper sequestration from simulated wastewater|
Bansal, M.; Mudhoo, A.; Garg, V.K. & Singh, D.
This paper reports the potential of chemically
treated wood chips to remove copper (II) ions from aqueous
solution a function of pH, adsorbent dose, initial copper
(II) concentration and contact time by batch technique.
The wood chips were treated with (a) boiling, (b) formaldehyde
and (c) concentrated sulphuric acid and characterized
by Fourier transform infrared spectroscopy, scanning
electron microscopy and energy dispersive analysis X-ray.
pH 5.0 was optimum with 86.1, 88.5 and 93.9 % copper
(II) removal by boiled, formaldehyde-treated and concentrated
sulphuric acid-treated wood chips, respectively, for
dilute solutions at 20 g L-1 adsorbent dose. The experimental
data were analysed using Freundlich, Langmuir,
Dubinin–Radushkevich and Temkin isotherm models. It
was found that Freundlich and Langmuir models fitted
better the equilibrium adsorption data and the adsorption
process followed pseudo-second-order reaction kinetics.
The results showed that the copper (II) is considerably
adsorbed on wood chips and it could be an economical
option for the removal of copper from aqueous systems.
Copper; Wood; Adsorption; Sulphuric acid; Formaldehyde