The isotherm and kinetic study of Nickel and Chromium adsorption by pumice powder from aqueous environments

AUTHORS

Masoud Moradi 1 , Meghdad Pirsaheb 1 , Touba Khosravi 1 , Ali Azari 2 , Kiomars Sharafi 1 , * , Hooshmand Sharafi 1

1 Research Center for Environmental Determinants of Health (RCEDH), Kermanshah University of Medical Sciences, Kermanshah, Iran

2 Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

How to Cite: Moradi M , Pirsaheb M , Khosravi T , Azari A , Sharafi K , et al. The isotherm and kinetic study of Nickel and Chromium adsorption by pumice powder from aqueous environments, Int J Health Life Sci. 2016 ; 2(1):e74057.

ARTICLE INFORMATION

International Journal of Health and Life Sciences: 2 (1); e74057
Published Online: July 15, 2016
Article Type: Research Article
Received: June 10, 2015
Accepted: April 08, 2016

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Abstract

Nickel and chromium are toxic heavy metals that have serious adverse effects on human health and the environment. The removal efficiency of nickel and chromium from aqueous solution was evaluated using pumice powder as an adsorbent. After preparing pumice powder, batch experiments were performed at different times and adsorbent dosages (pH=7, heavy metals concentrations = 50 mg/L, and stirring/minute= 200rpm). Obtained products were adsorbed using Langmuir and Freundlich isotherms, pseudo-first order and second-order models, intra-particle diffusion, and Elovich kinetics. Results indicate that nickel adsorbs more than chromium and adsorption of both nickel and chromium follows the Freundlich model. Correlation coefficients obtained from Freundlich model and pseudo-second order kinetic are R2=0.995, R2=0.996 and R2=0.999, respectively, which shows that the Freundlich expression and the kinetics of pseudo-second order provided a better fit to the experimental data of pumice powder. Also, the removal efficiency was increased significantly by increasing the adsorbent dose and contact time (R2<0.001). According to the obtained value (0 – 1) for dimensionless constant separation term of Langmuir model (RL) and adsorption intensity (1/n), pumice is a proper adsorbent for the removal of nickel and chromium from aqueous environments.

Keywords

Adsorbent Chromium Nickel Pumice Powder Removal

© 2016, International Journal of Health and Life Sciences. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

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