Adsorption of benzene onto mesoporous silicates modified by titanium

Mesoporous molecular sieve SBA-15 modified by titanium has been utilized for removing organic pollutants, such as benzene, from air. Titanium was impregnated inside SBA-15 by wetness impregnation after synthesis of SBA-15 (impregnation method) or was doped into the SBA-15 framework by the direct addition of Ti precursor into the sol during synthesis (doping method). In the breakthrough curves for gas-phase benzene adsorption, Ti addition into SBA-15 resulted in the enhancement of benzene adsorption capacity, depending on Ti loading amounts. An increase in adsorption temperature remarkably reduced the benzene adsorption capacity, indicating that the interaction between benzene and the materials was weak.