Enhanced visible-light-driven RhB removal with a Mo–Ni bimetallic sulfide/g-C3N4 nanosheet Schottky junction

In this work, Mo–Ni bimetallic sulfide with a narrow bandgap has been combined with g-C3N4 nanosheets to construct a novel Schottky junction (MNS/CNNS-x), via a facile ultrasound-assisted method. Photoelectrochemical investigations indicate that the bandgap alignment of CNNS and MNS favors the formation of a Schottky junction between the two materials, which facilitates the separation and accumulation of carriers via Schottky barriers for boosting the transformation of O2 toward superoxide radicals. As a result, the optimal heterojunction of MNS/CNNS-10 exhibits a superior Rhodamine B (RhB) degradation rate (0.0950 min−1), 3.6 times higher than that of g-C3N4 nanosheets (CNNS). The RhB removal rate is as high as 100% within 30 min, outperforming many reported CN-based photocatalysts. It is expected to expand to other pollutant degradation systems.