Thermodynamic Study of Isothermal Adsorption of Aluminum ion from Water using Activated Carbon Adsorbent

Touba Hamule; Asadolah Farhadi; Parisa Ghashghaee pour; Mohammad Ali Takassi
In this study, the thermodynamic property of isothermal adsorption of aluminum ion from aqueous solutions was investigated with activated carbon absorbent. The isothermal adsorption of aluminum ion by activated carbon absorbent was found to be an endothermic process. The adsorption of ion increases when temperature is elevated. Thermodynamic parameters were obtained. The values of ∆G, ∆H and ∆S are -1127.3, 4716.5, 19.6 j/mol. g(adsorbent) respectively. The adsorption was observed to be a spontaneous process. The adsorption of aluminum ion on activated carbon did not follow the Langmuir isotherm for liquid adsorbate on solid adsorbent. However, the adsorption follows the Freundlich isotherm. The nature of adsorption is physisorption. This investigation studied all effective parameters involved in the adsorption process: concentration of adsorbate, level of adsorbent, contact time, pH, and temperature. It was found that the adsorption of aluminum ion from aqueous solutions increases by increasing the concentration of adsorbate. The study concluded that the amount of adsorption increases by increasing the time of contact between adsorbate and adsorbent and also by increasing the level of absorbent. The study also revealed that maximum adsorption occurs at pH 5, and adsorption decreases at pH levels lower and higher than 5.
aluminum; activated carbon; adsorption; isotherm; physisorption
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