Removal of Organic Dye by Ti-Doped Bi₂O₃/MMT with Enhanced Visible-Light Photocatalytic Activity

Ti-doped Bi₂O₃/montmorillonite (TBM) was prepared by chemical solution decomposition and used to conduct adsorption and degradation experiments. The materials were characterized by detection methods such as XRD, SEM, BET, XPS, UV-Vis DRS, etc. The results showed that doping Ti can inhibit the growth of Bi₂O₃ grains and destroy the layered structure of montmorillonite. Furthermore, doping Ti can improve the adsorption ability and reduce the band gap of the photocatalyst, thus enhancing the photocatalytic degradation performance. When the Ti doping ratio was 4% (4TBM), the material dosage was 1.0 g/L, and the initial concentration was 20 mg/L, 4TBM has the best photocatalytic degradation effect on reactive brilliant blue KN-R, with a removal rate of 98.17%. The photocatalytic degradation process of reactive brilliant blue KN-R follows the first-order kinetic model. This study not only has great significance for environmental remediation but also provides an optical material with excellent performance for the optical field.