Phenol adsorption by charred sawdust of sheesham (Indian rosewood; Dalbergia sissoo) from single, binary and ternary contaminated solutions

The objective of this work was to evaluate the potential of sheesham sawdust (Indian rosewood; Dalbergia sissoo) charred at 673 K (SSD673) for the removal of phenol from aqueous solution as single contaminant, and competitively from binary and ternary contaminated waters. The experimental observations for removal from single-contaminant water fit well on the Langmuir adsorption model, showing q(max) of 344.83 mg phenol/g SSD673 at 45 degrees C. Adsorption equilibrium was established within 90 min of adsorbate-adsorbent contact and the data obeyed pseudo-second order kinetics model. FT-IR spectroscopy revealed the presence of carbonyl, aldehyde, carboxyl and cellulosic groups that participated in the adsorption of phenol. The adsorption of phenol from binary contaminated system in the presence of methylene blue and Hg2+ was as efficient as from single-contaminant solution, indicating better affinity of SSD673 for phenol. The order of adsorption affinity of SSD673 in the ternary contaminated system was phenol > methylene blue > Hg2+. Studies have revealed that SSD673 has high adsorption capacity and rapid kinetics, while the adsorbent is low-cost and eco-friendly showing potential for use in the treatment of waters containing multiple-contaminants. (C) 2012 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.