Journal article

Publication year: 2009

Pages: 395-401

Journal: Journal of Hazardous Materials

Volume number: 169

Issue number: 1-3

ISSN: 0304-3894

eISSN: 1873-3336

DOI Link: https://doi.org/10.1016/j.jhazmat.2009.03.109

Publisher: Elsevier

Abstract: 
This study was initiated to investigate the adsorption of cadmium from aqueous solution by two different rock types-Pumice (VPum) and Scoria (VSco), which are readily available in Ethiopia and other countries. The influence of operational conditions, such as particle size, adsorbent/solution ratio, contact time, cadmium initial concentration, and pH was analyzed. The competition between metals was also evaluated. The Cd(II) removal capacity was predominantly affected by the pH conditions, being increased under alkaline conditions. For both adsorbents, when particle size was 0.075-0.425 mm, the maximum Cd(H) adsorption was observed at pH 6.0 (contact time = 24 h, shaking speed = 200 rpm, adsorbent dose = 50 g L-1). Adsorption process revealed that the initial uptake was very fast during the first 1 h. The kinetics of the interactions follows pseudo second-order. Equilibrium assays confirm that VPum has a larger capacity and affinity for Cd(II) adsorption than VSco. Both Langmuir and Freundlich models described equally well the experimental data. VPum and VSco were found to be promising material for the removal of cadmium from metal bearing water. (C) 2009 Elsevier B.V. All rights reserved.

Harvard Citation style: Alemayehu, E. and Lennartz, B. (2009) Virgin volcanic rocks: Kinetics and equilibrium studies for the adsorption of cadmium from water, Journal of Hazardous Materials, 169(1-3), pp. 395-401. https://doi.org/10.1016/j.jhazmat.2009.03.109

APA Citation style: Alemayehu, E., & Lennartz, B. (2009). Virgin volcanic rocks: Kinetics and equilibrium studies for the adsorption of cadmium from water. Journal of Hazardous Materials. 169(1-3), 395-401. https://doi.org/10.1016/j.jhazmat.2009.03.109