shows the UV–VIS absorption spectra of the silica samples. As can be seen, the UV absorption ability of MS is higher than that of nonporous D-SiO2 and is ascribed to the light reflecting and scattering in the mesopores of MS. As expected, the UV absorption ability of MCX-MS was significantly increased between 290 and 400 nm due to the presence of MCX, confirming that significant amount of the MCX molecules was encapsulated in the mesoporous silica matrix. In other words, the UV absorption ability of the MCX-MSA was lower than that of MCX-MS, supporting that less MCX was contained in MCX-MSA than in MCX-MS.