REMOVAL OF Pb(II) FROM WASTEWATERS BY ACTIVATED CARBON FROM LEBANESE CYMBOPOGON CITRATUS (LEMONGRASS): A COMPARATIVE STUDY

Hala Haidar, Akram Hijazi, Dania Houssein, Wassef El Khatib, Hassan Rammal, Ali Mcheik, Ziad Damaj[a] and Abd-Al-Ameer Al Rekaby Damaj, Abd-Al-Ameer Al Rekaby

Abstract


This study is made to prove the efficiency of the activated carbon (AC) of Lebanese Cymbopogon citratus in the adsorption of lead (Pb(II)) from aqueous medium. The adsorption was found to be dependent on initial metal ion concentration, pH of the solution, temperature, contact time and adsorbent dose. The maximum adsorption capacity was found for the concentration of 450 mg/L, pH 4, temperature 25oC, contact time 2h, and adsorbent dose 1g. The equilibrium adsorption was better described by Freundlich isotherm model rather than Langmuir model.

The kinetic data were better represented by the pseudo-second-order than the pseudo-first-order kinetic model. Thermodynamic studies showed that the process was exothermic and spontaneous.

The results of this study reveal that the activated carbon (AC) of Lebanese Cymbopogon citratus is a very effective and environmentally friendly adsorbent, with low cost for Pb (II) removal.


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DOI: http://dx.doi.org/10.17628/ecb.2016.5.23-28

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