| Summary: | Surface application of photocatalyst in cement-based materials could endow it with photocatalytic properties, however, the weak adhesion between photocatalyst coatings and the substrates may result in poor durability in outdoor environments. In this study, TiO<sub>2</sub>@SiO<sub>2</sub> core-shell nanocomposites with different coating thicknesses were synthesized by varying the experiment parameters. The results indicate that SiO<sub>2</sub> coatings accelerated the rhodamine B removal to a certain extent, owing to its high surface area; however, more SiO<sub>2</sub> coatings decreased its photocatalytic efficiencies. The cement matrix treated with TiO<sub>2</sub>@SiO<sub>2</sub> core-shell nanocomposites showed good photocatalytic efficiency and durability after harsh weathering processing. A reaction mechanism was revealed by the reaction of TiO<sub>2</sub>@SiO<sub>2</sub> nanocomposites with Ca(OH)<sub>2</sub>.
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