Tailoring Activated Carbon Properties for Pb(II) and Cr(VI) Removal from Water in Continuous Mode

Tailoring Activated Carbon Properties for Pb(II) and Cr(VI) Removal from Water in Continuous Mode

Dynamic adsorption of Cr(VI) and Pb(II) in single and binary mixture solutions at different pH values (2 and 6) was studied on activated carbons obtained by chemical activation of olive stones with different agents. The activated carbons exhibited large surface areas with diverse pore size distribut...

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Bibliographic Details
Published in:Chemical engineering & technology Vol. 45; no. 2; pp. 258 - 265
Main Authors: Boustila, Houda, Boutillara, Yasmine, Velasco, Leticia Fernandez, Djellali, Ali, Tazibet, Sana
Format: Journal Article
Language:English
Published: Frankfurt Wiley Subscription Services, Inc 01-02-2022
Subjects:
Activated carbon
Activated carbons
Adsorption
Binary mixtures
Chromium
Contaminants
Lead
pHpzc
Pore size
Surface chemistry
Water pollution
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Summary:Dynamic adsorption of Cr(VI) and Pb(II) in single and binary mixture solutions at different pH values (2 and 6) was studied on activated carbons obtained by chemical activation of olive stones with different agents. The activated carbons exhibited large surface areas with diverse pore size distributions and surface chemistry. The adsorption tests, performed in continuous mode, revealed the existence of different adsorption sites for Pb(II) and Cr(VI). Besides, they emphasized the significant role of the pH, both of the medium and of the carbon surface, in the adsorption of Cr(VI). That is, an acidic medium favors the retention of Cr(VI) on activated carbon having a surface pH around 2 whereas an activated carbon with a more neutral surface shows high efficiency for binary mixtures at high contaminant concentrations for solulions at pH 6. Retention in continuous mode of Cr(VI) and Pb(II) in single and mixture solutions on different activated carbons at different pH conditions and initial concentrations was studied. The aim was to shed light on the different adsorption mechanisms taking place as well as the effects of the activated carbon properties in this process, and thus, to enhance the efficiency of these materials.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.202100331