adsorption of indigo carmine dye onto physicochemical-activated leaves of agave americanal

Dyes represent a serious threat to the environment when released in wastewaters. hence, the main objective of this work was to design and fabricate an activated carbon from an invasive plant – agave americana l – capable of removing indigo carmine in aqueous solutions. the equilibrium adsorption of indigo carmine was assessed using the freundlich, langmuir, and dubinin-radushkevich isotherm model. the zinc chloride was used to activate the powder of agave at 600 °c and 900 °c. the results of this work showed that the elaborated activated carbon had maximum adsorption of 61.72 mg/g and a specific surface area of 38 m²/g determined using the bet method. the thermodynamic study showed that the adsorption of indigo carmine on the activated carbon was endothermic. therefore, the activated carbon prepared from the agave americana l would be an efficient and cost-effective alternative adsorbent of indigo carmine and would have a positive effect on the environment.