Adsorptıon Of Fluorıde Wıth Acıd, Lanthanum And Alumınum Impregnated Actıvated Carbons
In this study, seven adsorbents were used for the removal of fluoride from aqueous solutions:activated carbon (AK), aluminum impregnated activated carbon (AAL), lanthanum impregnated activated carbon (ALA), and four acid treated activated carbons (A05, A10, A15,A20).
Acid treated activated carbons were prepared by 0.5, 1, 1.5 and 2 M sulphuric acid. Aluminum impregnated carbon and lanthanum impregnated carbon were prepared by aluminum and lanthanum solutions.
Adsorption experiments were carried out as a function of pH, time and initial concentration. Adsorption kinetic for each adsorbent was found to follow the first order Lagergren equation. The kinetic studies also indicated that the adsorption of fluoride on each adsorbent was both fılm dıffusıon and intraparticle difusion. Intraparticle difusion constants were calculated.
The adsorption capacities were obtained from the Langmuir isotherm. The adsoption capacity
was in the order: ALA > AAL > A20 > A15 > A10 > A05 > AK
Column experiments were carried out to understand the behaviour of the adsorbents in a dynamic system and the column capacity for ALA was calculated.
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