The objective of this paper is to propose an adsorption isotherm model for methylene blue on composite activated carbons derived from cotton (Gossypium hirsutum) hulls and capsules. The adsorption mechanism involved was described using a three-parameter model that is intermediate between the Langmuir and Frundlich models and is characterized by its ease of use and physical interpretability. The experimental adsorption data were first adjusted using nine classical isotherm models, whose performance was evaluated using five statistical criteria: the adjusted coefficient of determination, the residual sum of squares, the Akaike information criterion (AIC), and the Bayesian information criterion (BIC). The models were best fitted in the following order: Sips˃ Toth˃ Redlich-Peterson˃ Khan˃Langmuir˃ Frundlich˃ Jovanovich˃ Dubinin-Radushkevich. The proposed model provides the best fit with the experimental data for methylene blue adsorption on activated carbons derived from cottonseed shells and cotton (Gossypium hirsutum) capsules, with a determination coefficient of 0.9910 and a theoretical maximum adsorption capacity qm of 820.86 mg.g-1, approximately double that predicted by classical models, illustrating an expected improvement in the predicted performance of the studied activated carbon.

Pineapple leaves are usually buried or left to rot in the fields after the fruit is harvested. The aim of this study to harness the potential of plant fibers present in pineapple leaves to product hair strands. in order to reduce the dependence on synthetic resources derived from petroleum, which are often used in the production of strands. conventional capillaries. The methodology used includes several essential steps. First, the fibers are extracted manually. The fibers are then bleached using a 6% aqueous NaOH solution for 6 hours to remove any unwanted pigmentation, increase their versatility and achieve an optimal balance between whiteness and strength. The fibers were colored with natural indigo-based dyes. Color saturation and different shades are obtained by letting them soak for between 45 and 90 min. Finally, the colored fibers are immersed in a mixture of beeswax (90%) and paraffin (10%) to significantly improve their flexibility and water resistance. The wicks thus obtained have appreciable aesthetic and mechanical characteristics which are beneficial for the preservation of the environment.