Construction of N-doped 2D TiO2/MoS2 S-scheme heterojunction for enhanced photodegradation activity by rhodamine B

Abstract

Large-size 2D TiO₂ was prepared by hydrothermal method, then N doping was carried out ultrasound-assisted methods were utilized to successfully prepare N-TiO₂/MoS₂ composites for simulating the degradation of rhodamine B (RhB) under sunlight. The degradation rate of RhB by N-TiO₂/MoS₂ was as high as 92%, which was 40% higher than the 2D N-TiO₂ and 59% higher than that of TiO₂. N doping TiO₂ can effectively improve the response to visible light and regulate its conduction band, with MoS₂ to construct a new type of S-scheme heterojunction photocatalysts, which promotes the separation and transfer of carriers, and at the meantime, crushed MoS₂ exposes more active sites. So the performance of photocatalytic degradation was improved. This work constructs the efficient semiconductor photocatalytic nano-heterostructures which is important for the surface modification of defective TiO₂ to improve the degradation of photocatalysts. It also introduces a novel approach to the straightforward synthesis with fresh powerful photocatalysts.