Adsorption of Methylene Blue on Mesoporous SBAâ€15 in Ethanolâ€water Solution with Different Proportions

Abstract

The adsorption behavior of mesoporous SBAâ€15 materials to methylene blue (MB) as model molecule has been studied in different proportions of ethanolâ€water solution. It was found that adsorption capacity and adsorption rate of SBAâ€15 to methylene blue were the best in aqueous solution and the worst in anhydrous ethanol solution, in addition, adsorption capacity and adsorption rate increase as the proportion of water increased in ethanolâ€water solution. It’s interesting that the release behavior at a specific time appeared in the adsorption process of SBAâ€15 to methylene blue from anhydrous ethanol solution or ethanolâ€water solution. The adsorption kinetics of methylene blue (MB) on mesoporous SBAâ€15 samples in different solution have been analyzed and discussed based on the composition, the morphology, the surface area, pore size distribution and adsorption/desorption measurements measured with scanning electron microscopy (SEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), nitrogen adsorptionâ€desorption and spectrophotometer technique.