Synthesis and Performance Enhancement Mechanis of BiOI / g-C3N4 Photocatalyst with High Activity

The synthesis of stable and efficient photocatalysts is the key of photocatalysis technology. This work uses the situ deposition method to construct diverse mass ratio BiOI / CNx series of composite materials, which composited with BiOI doesn’t influence the crystal structure of g-C3 N4 . In addition, the crystal form BiOI from composite products is closely adhered to the surface of lamellar g-C3 N4 . The introduction of BiOI obviously decreases band gap and availably increases the absorption of visible light. Meanwhile, the service life of photoproduction electron-holes gradually strengthens with the compound quantity of BiOI increasing. BiOI / CN15 has the strongest adsorption capacity and photocatalytic activity for RhB. Therefore, the absorption rate of g-C3 N4 reached 55. 15% under dark reaction for 30 minutes, which is 2. 68 times than g-C3 N4 in the same condition. The degradation rate of g-C3 N4 was 87. 69% at 10 minutes of photodegradation, which is 1. 9 times than g-C3 N4 in the same condition. The catalytic reaction rate constant is 5. 551×10-2 min-1 . And the degradation rate only decreased by 4. 5% after five recycles, which owns good stability of photocatalyst. The combination of BiOI and g-C3 N4 is beneficial to the effective separation of photogenic electron-holes pairs and the rapid transfer of electrons between interfaces. In the degradation of RhB by BiOI / CN15 composite photocatalyst, h+ and ·O2- are the main active substances. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.