Author(s) :

Laith Amjad Hameed, Noor S. Abd AL-hadi.

Volume/Issue :

Abstract :

The objective of this study is to evaluate the influence of the activating agent concentration on the removal of methyl orange using activated carbons derived from eggplant stems. The activated carbons were prepared using the chemical activation process with orthophosphoric acid (H3PO4) at concentrations of 10% and 30%. The activation time and temperature were set at 3 hours and 400 °C, respectively. Various adsorption tests were conducted in a batch system by varying the time, carbon dose, pH, and the concentration of the dye solution. The activated carbons obtained through this process were labeled as CA10% and CA30%. The results of the adsorption kinetics indicate that the equilibrium time is 50 minutes and 70 minutes for CA30% and CA10%, respectively. Adsorption is therefore faster for the carbon produced with the higher concentration of the activating agent (H3PO4 30%). Furthermore, the kinetic modeling follows the pseudo-second-order model for both types of carbon. Additionally, the adsorption rate increases with the mass of activated carbon, and the optimal pH for dye removal is pH = 2. In conclusion, both types of activated carbon demonstrate good adsorption capacities for methyl orange, with more than 80% removal and a shorter equilibrium time for CA30%. These performances indicate the potential for valorizing agricultural waste, such as eggplant stems, into porous materials for dye removal from aqueous environments.

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