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Removal of Cr(VI) from aqueous environments using micelle-clay adsorption.

Qurie M, Khamis M, Manassra A, Ayyad I, Nir S, Scrano L, Bufo SA, Karaman R - ScientificWorldJournal (2013)

Bottom Line: Batch experiments showed the effects of contact time, adsorbent dosage, and pH on the removal efficiency of Cr(VI) from aqueous solutions.Langmuir adsorption isotherm fitted the experimental data giving significant results.The micelle-clay complex used in this study was capable of removing Cr(VI) from aqueous solutions without any prior acidification of the sample.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry and Chemical Technology, Faculty of Science and Technology, Al-Quds University, 20002 Jerusalem, Palestine ; Department of Science, University of Basilicata, Via dell'Ateneo Lucano 10, 85100 Potenza, Italy.

ABSTRACT
Removal of Cr(VI) from aqueous solutions under different conditions was investigated using either clay (montmorillonite) or micelle-clay complex, the last obtained by adsorbing critical micelle concentration of octadecyltrimethylammonium ions onto montmorillonite. Batch experiments showed the effects of contact time, adsorbent dosage, and pH on the removal efficiency of Cr(VI) from aqueous solutions. Langmuir adsorption isotherm fitted the experimental data giving significant results. Filtration experiments using columns filled with micelle-clay complex mixed with sand were performed to assess Cr(VI) removal efficiency under continuous flow at different pH values. The micelle-clay complex used in this study was capable of removing Cr(VI) from aqueous solutions without any prior acidification of the sample. Results demonstrated that the removal effectiveness reached nearly 100% when using optimal conditions for both batch and continuous flow techniques.

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Effect of the initially adjusted pH on the removal of chromium by micelle-clay complex (■) and pure clay (♦). Initial concentration of Cr(VI) = 50 mg L−1, contact time = 3 h, temperature = 25.0 ± 0.2°C, and adsorbent dosage = 5.0 g L−1. Data represent averages of total-Cr triplicate measurements (AAS) ± SE.
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fig1: Effect of the initially adjusted pH on the removal of chromium by micelle-clay complex (■) and pure clay (♦). Initial concentration of Cr(VI) = 50 mg L−1, contact time = 3 h, temperature = 25.0 ± 0.2°C, and adsorbent dosage = 5.0 g L−1. Data represent averages of total-Cr triplicate measurements (AAS) ± SE.

Mentions: Figure 1 displays the effect of the initially adjusted pH on the removal of total-Cr from water by using either the pure clay or the micelle-clay complex. The maximum adsorption on the micelle-clay complex was obtained at pH between 1.0 and 3.0 (98%). In addition, as striking result it emerged that even at pH = 6 the adsorption was efficient with more that 85% of chromium removal. These results can be explained taking into account that Cr(VI) can give rise to anions with different charge density when exposed to different pH values and undergo transformations into diverse oxidation states.


Removal of Cr(VI) from aqueous environments using micelle-clay adsorption.

Qurie M, Khamis M, Manassra A, Ayyad I, Nir S, Scrano L, Bufo SA, Karaman R - ScientificWorldJournal (2013)

Effect of the initially adjusted pH on the removal of chromium by micelle-clay complex (■) and pure clay (♦). Initial concentration of Cr(VI) = 50 mg L−1, contact time = 3 h, temperature = 25.0 ± 0.2°C, and adsorbent dosage = 5.0 g L−1. Data represent averages of total-Cr triplicate measurements (AAS) ± SE.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3814082&req=5

fig1: Effect of the initially adjusted pH on the removal of chromium by micelle-clay complex (■) and pure clay (♦). Initial concentration of Cr(VI) = 50 mg L−1, contact time = 3 h, temperature = 25.0 ± 0.2°C, and adsorbent dosage = 5.0 g L−1. Data represent averages of total-Cr triplicate measurements (AAS) ± SE.
Mentions: Figure 1 displays the effect of the initially adjusted pH on the removal of total-Cr from water by using either the pure clay or the micelle-clay complex. The maximum adsorption on the micelle-clay complex was obtained at pH between 1.0 and 3.0 (98%). In addition, as striking result it emerged that even at pH = 6 the adsorption was efficient with more that 85% of chromium removal. These results can be explained taking into account that Cr(VI) can give rise to anions with different charge density when exposed to different pH values and undergo transformations into diverse oxidation states.

Bottom Line: Batch experiments showed the effects of contact time, adsorbent dosage, and pH on the removal efficiency of Cr(VI) from aqueous solutions.Langmuir adsorption isotherm fitted the experimental data giving significant results.The micelle-clay complex used in this study was capable of removing Cr(VI) from aqueous solutions without any prior acidification of the sample.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry and Chemical Technology, Faculty of Science and Technology, Al-Quds University, 20002 Jerusalem, Palestine ; Department of Science, University of Basilicata, Via dell'Ateneo Lucano 10, 85100 Potenza, Italy.

ABSTRACT
Removal of Cr(VI) from aqueous solutions under different conditions was investigated using either clay (montmorillonite) or micelle-clay complex, the last obtained by adsorbing critical micelle concentration of octadecyltrimethylammonium ions onto montmorillonite. Batch experiments showed the effects of contact time, adsorbent dosage, and pH on the removal efficiency of Cr(VI) from aqueous solutions. Langmuir adsorption isotherm fitted the experimental data giving significant results. Filtration experiments using columns filled with micelle-clay complex mixed with sand were performed to assess Cr(VI) removal efficiency under continuous flow at different pH values. The micelle-clay complex used in this study was capable of removing Cr(VI) from aqueous solutions without any prior acidification of the sample. Results demonstrated that the removal effectiveness reached nearly 100% when using optimal conditions for both batch and continuous flow techniques.

Show MeSH
Related in: MedlinePlus