Degradation of Rhodamine B by Visible Light Driven MoO₃@TiO₂ Core–Shell Photocatalyst

In this study, a MoO 3 @TiO 2 composite core–shell material was developed to remove Rhodamine B (RhB) dye through synergistic adsorption and photocatalytic degradation. n–n heterostructures were formed by coupling n-type semiconductors to enhance the efficiency of photocarrier separation and photocatalytic performance. MoO 3, which possesses strong adsorption capacity, was primarily used as a dye adsorbent. Additionally, the formation of an n–n heterojunction with TiO 2 enabled MoO 3 to expand the photocorresponding range of TiO 2, leading to the generation of superoxide (O 2 • ) and hydroxyl ( • OH) free radicals for dye degradation. The experimental results demonstrate that the MoO 3 @TiO 2 core–shell composite exhibits excellent performance for RhB dye removal, with adsorption and degradation rates reaching 35.7 and 70.3%, respectively, even at low catalyst concentrations. This approach offers new insights into the development of MoO 3 core–shell photocatalysts.