Degradation\nof Rhodamine B by Visible Light Driven\nMoO<sub>3</sub>@TiO<sub>2</sub> Core–Shell Photocatalyst

In this study, a MoO<sub>3</sub>@TiO<sub>2</sub> composite\ncore–shell\nmaterial was developed to remove Rhodamine B (RhB) dye through synergistic\nadsorption and photocatalytic degradation. n–n heterostructures\nwere formed by coupling n-type semiconductors to enhance the efficiency\nof photocarrier separation and photocatalytic performance. MoO<sub>3</sub>, which possesses strong adsorption capacity, was primarily\nused as a dye adsorbent. Additionally, the formation of an n–n\nheterojunction with TiO<sub>2</sub> enabled MoO<sub>3</sub> to expand\nthe photocorresponding range of TiO<sub>2</sub>, leading to the generation\nof superoxide (O<sub>2</sub><sup>•</sup>) and hydroxyl (<sup>•</sup>OH) free radicals for dye degradation. The experimental\nresults demonstrate that the MoO<sub>3</sub>@TiO<sub>2</sub> core–shell\ncomposite exhibits excellent performance for RhB dye removal, with\nadsorption and degradation rates reaching 35.7 and 70.3%, respectively,\neven at low catalyst concentrations. This approach offers new insights\ninto the development of MoO<sub>3</sub> core–shell photocatalysts.