Synthesis of NaBiO3/Bi2O3 heterojunction-structured photocatalyst and its photocatalytic mechanism

A series of NaBiO3/Bi2O3 composites with different contents of NaBiO3 were synthesized. Their crystalline phases, compositions, light absorption performances and electron–hole separation situations were characterized. Also, their photocatalytic activities were compared by degrading malachite green solution. The results showed that 4.75% NaBiO3/Bi2O3 demonstrated the best photocatalytic activity. Approximately 95.70% of malachite green was degraded after illuminating for 300 min. The photocatalytic mechanism of the heterojunction-structured photocatalyst was put forward as well.