American Journal of Innovative Research & Applied Sciences
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| ARTICLES | Am. J. innov. res. appl. sci. Volume 8, Issue 5, Pages 190-199 (May 2019)
American Journal of innovative
Research & Applied Sciences
ISSN 2429-5396 (Online)
OCLC Number: 920041286
| MAY 8 | N° 5 | 2019 |
*Correspondant author and authors Copyright © 2019:
1. Ibn Tofail University | Faculty of Science | Department of Chemistry | Laboratory Agro-Resources, Organic Polymers and Process Engineering (LRGP)/Team Organic Chemistry and Polymer (ECOP) | Kenitra | Morocco |
This article is made freely available as part of this journal's Open Access: ID | Hanane-ManuscriptRef.7-ajira150319 |
Background: The technique of hot dip galvanizing is one of the most used techniques in the metallurgical industries. This technique requires a very large amount of water during its stages, which generates a considerable volume of effluents loaded with inorganic micro pollutants (heavy metals). These pollutants have the ability to concentrate along the food chain and accumulate in certain organs of the human body. In the last decades, adsorption is low-cost technology and one of best solutions for water and wastewater purification. Adsorption using activated carbon, a phase transfer process has been widely used in practice to remove contaminants in all their forms (organic and inorganic) from fluid phases because of the low investment in initial cost and design simplicity. Objectives: This Research aims to characterize activated carbon prepared from dates stones and to study its efficiency in removal of zn2+ and cu2+ metallic ions from liquid effluents. Methods: The activated carbon prepared was characterized by Fourier Transform Infrared Spectroscopy, and the assay of Cu2+ and Zn2+ ions was conducted by Flame Atomic Absorption Spectroscopy. The influences of the several operational parameters on the adsorption (mass of the adsorbent, pH and contact time) were examined. Results: As the dose increased, removal efficiency increased. The optimum pH for Cu2+and Zn2+ removal was 6.The experimental sorption equilibrium followed both Langmuir (R2=0.904 for Zn2+and R2=0.900 for Cu2+) and Freundlich (R2=0.959 for Zn2+and R2=0.934 for Cu2+) relatively more of Freundlich. The experimental data fitted pseudo first (R2=0.911 for Zn2+ and R2=0.937 for Cu2+) and second (R2=0.998 for both ions) order kinetic models, being relatively better described by the pseudo-second-order. The thermodynamic parameters relating to the adsorbent/adsorbate system studied indicate that the adsorption process is spontaneous, exothermic and of the physical nature. Conclusions: The results obtained in this study showed that activated carbon prepared from dates stones can be used for the removal of heavy metals.
Keywords: Adsorption, activated carbon, isotherms, Langmuir, Freundlich, thermodynamic, pseudo-first-order, pseudo-second-order, copper, zinc.
ADSORPTION KINETICS AND ISOTHERMS FOR THE REMOVAL OF ZN2+ AND CU2+ METALLIC IONS FROM LIQUID EFFLUENTS BY ACTIVATED CARBON PREPARED FROM DATES STONES
| Hanane Arroub *1 | and | Ahmed El harfi 1 |. Am. J. innov. res. appl. sci. 2019; 8(5):190-199.
| PDF FULL TEXT | | XML FILE | | Received | 15 March 2019 | | Accepted | 15 May 2019 | | Published | 05 May 2019 |