The emission of volatile organic compounds (VOCs) is an important source of air pollutionthat has an adverse impact on human health [1]. In recent years, considerable efforts havebeen made to develop efficient approaches to remove those harmful gases. The thermal oxidation [2] and the photocatalytic oxidation [3] are promising technologies for air purification because the pollutants are converted to H2O and CO2. However, for low pollutant concentrations, thermally catalytic oxidation is not economically feasible.