Preparation of mixed-phase TiO2/Ti3C2 composites by solid-phase milling-roasting: Efficient visible-light-driven photocatalytic degradation of rhodamine B

Reasonable interface design is a key factor to improve the activity of photocatalysts. In this paper, TiO 2 /Ti 3 C 2 composite photocatalyst with high activity of anatase/rutile mixed crystal were prepared by solid-phase milling-roasting method. The microstructure of the mixed-phase TiO 2 /Ti 3 C 2 composites could be adjusted by the calcination temperature and additive content. The results showed that NaBF 4 could promote the transformation of anatase TiO 2 to rutile TiO 2 . An appropriate amount of rutile TiO 2 forms a heterojunction with anatase TiO 2 , which enables efficient charge separation and transfer at the interfaces of the composites. The optimized sample (MT550) showed 98 % degradation of rhodamine B (RhB) under visible light irradiation within 180 min, which was 8 times higher than that of the sample without added NaBF 4 . This study presents a strategy for the synthesis of mixed-phase (anatase/rutile) TiO 2 /Ti 3 C 2 composites with high activity under visible light, which has potential in the design and application of photocatalytic materials.