“…However, one of the main drawbacks is very poor adsorptive power to some dyes [27,29] and other organic pollutants [41,42]. Accordingly, the supported TiO 2 particles with activated carbon [41], alumina [42], silica [41,42], mesoporous silica shell [43], MCM-41 [44] and SBA-15 [45], respectively; the TiO 2 surfaces modified with Al 2 O 3 [30], SiO x [46], MgO x [47], respectively; TiO 2 -SiO 2 and TiO 2 -Al 2 O 3 composites [27,48,49], etc. have been extensively studied in order to improve their adsorption performances and photocatalytic activities.…”