Figure (a) shows that two of the three samples presented higher loading efficiency in their uncalcined version, supported by a higher surface area, pore size, and pore volume recorded in Figure . In Figure (b), using the optimum conditions of Salahuddin in a similar adsorption system for two samples (H5 and H9-EN in their uncalcined version that presented higher adsorption), 44.9% was obtained for H9-EN with an increase of 60.59% and 79.14% compared to the first condition for H9-EN and H5, respectively.