An Investigation and Comparison of Removing Heavy Metals (Lead and Chromium) from Aqueous Solutions Using Magnesium Oxide Nanoparticles
Abdollah Dargahi1,4, Hafez Golestanifar2, Parviz Darvishi3, Amir Karami4, Syed Hadi Hasan5, Ali Poormohammadi6,4, Alireza Behzadnia3
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1Department of Environmental Health Engineering, Faculty of Health, Kermanshah University of Medical Sciences,
Kermanshah, Iran
2Department of Environmental Health Engineering, Exploration Directorate, NIOC, Tehran, Iran
3Department of Chemical Engineering, Shahrood Branch, Islamic Azad University, Shahrood, Iran
4Department of Environmental Health Engineering, Hamadan University of Medical Sciences, Hamadan, Iran
5Water Pollution Research Laboratory, Department of Chemistry, Indian Institute of Technology
(Banaras Hindu University), Varanasi 221005, UP, India
6Social Development and Health Promotion Research Center, Kermanshah University of Medical Sciences,
Kermanshah, Iran
Submission date: 2014-09-24
Final revision date: 2015-10-17
Acceptance date: 2015-10-19
Publication date: 2016-03-17
Pol. J. Environ. Stud. 2016;25(2):557-562
This study aims to investigate the effi ciency of magnesium oxide nanoparticles (MON) in vitro for the removal of lead (II) and chromium (VI) from aqueous environments. The effects of various parameters such as contact time (15 to 280 min), pH (3, 5, 7 and 9), the initial concentration of lead/chromium (10, 20, 30.40 and 50 mg/L), absorbent dose (0.3, 0.5 and 0.8 g/L), and shaking speed (150 to 350 rpm) was investigated. The parameters were optimized by varying one parameter at a time and keeping other parameters constant. The maximum removal effi ciency of MON for lead (II) and chromium (VI) was achieved at contact time 280 min, pH 9, initial concentration of lead/chromium 10 mg/L, adsorbent dose 0.8 g/L, and shaking speed 250 rpm. The results also indicated that MON convert the Pb2+ to Pb0 and Cr6+ to Cr3+ during the removal process. The adsorption of lead (II) and chromium (VI) follows the Langmuir isotherms, therefore the adsorption was of a physical nature.
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