چكيده به لاتين
In this thesis, amine-functionalized mesoporous silica with co-condensation method is prepared via a one-pot synthesis method using CTAB as surfactant and APTES as the structural directing agent and also the source of amine groups. The effect of four parameters including; rate of precursor addition, concentration of surfactant, solvent-to-precursor volume ratio and ethanol-to-water volume ratio in solvent on enhancement of Sears number was investigated. Taguchi method was used to design the experiments in order to minimize the number of required tests to reach the optimum product. Results showed that rate of precursor addition is the most influential parameter on Sears number, ethanol-to-water volume ratio in solvent and concentration of precursor stand in second and third place of importance, respectively. Finally, concentration of surfactant is the less influential parameter. The optimum product was characterized with SAXS, FTIR-Spectroscopy, FESEM, TEM, BET and DLS tests. Results revealed that the optimum sample is amine-functionalized mesoporous MCM-41 silica spheres with hexagonal pore structure and average size of 330 nm in diameter. Performance of this amine-functionalized mesoporous silica in acetone adsorption as one of the most common VOCs was investigated. Adsorption test results showed that this sample with BET surface area and pore volume of 625 m2/g and 143.56 cm3/g, respectively, is able to adsorb 69.39 mg/g of acetone under static condition. The adsorption capacity achieved is about 10 times more that the adsorption capacity reported by other researchers for similar samples functionalized with post-synthesis method. Adsorption kinetic study revealed that pesudo-second order rate equation correlates the adsorption data of acetone on amine-functionalized mesoporous silica with a proper agreement. Freundlich isotherm suitably predicts the static adsorption test results.
