Owing to the great harm that water pollution has caused to the natural environment, the effective treatment of sewage is crucial. In this study, Sm-TiO 2 /g-C 3 N 4 composites were synthesized for the degradation of MB and TC pollutants. The experimental results showed that up to 91.8% and 93.3% of MB and TC pollutants were removed within 120 min of illumination, which were 2.8 and 2.3 times greater than that of pure TiO 2 , respectively, showing the good optical properties of the composites. Due to the coupling between Sm-TiO 2 and g-C 3 N 4 , the separation of photogenerated electron holes is accelerated, thereby enhancing the photocatalytic activity of the composites. This not only enabled the strong redox ability of TiO 2 to be retained, but also effectively promoted electron migration, thus improving the photocatalytic activity of the composites.

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g-C 3 N 5 has wide-ranging applications in photocatalysis owing to its twodimensional layered structure, large surface area, and small band gap. In this study, the surface of g-C 3 N 5 was subjected to inorganic acid modification and combined with BiOCl to form a heterojunction, effectively improving the photocatalytic activity of the material. The rates of degradation of rhodamine B and ciprofloxacin by the 15-C 3 N 5 -BiOCl composite photocatalyst were 22.2 and 20.7 times higher, respectively, than those of degradation by g-C 3 N 5 . This was attributed to the Z-type heterojunction formed by g-C 3 N 5 and BiOCl, which significantly improved the efficiency of photogenerated electron-hole pairs separation and broadened the optical response range. The preparation of novel photocatalysts has broad application prospects in the treatment of organic pollutants in water.