Photoelectrochemical detection of chromium (VI) using layered MoS 2 modified BiOI

In recent years, BiOI has been extensively studied due to its excellent absorption ability of visible light. However, low energy conversion efficiency affects its potential for practical application. In this paper, MoS 2 /BiOI composite was synthesized by two-step ways and applied to the photoelectrochemical (PEC) detection of hexavalent chromium (Cr (VI)). Through a series of optical characterization, the structure and morphology of the material were measured in detail. UV–Vis diffuse reflection spectra and photoluminescence (PL) further proved that MoS 2 /BiOI have the excellent PEC properties. The PEC experiment proved that the prepared MoS 2 /BiOI has a wide linear range (0.05–160 μM) and low detection limit (0.01 μM, at S/N = 3), moreover, it has great application potential in actual samples. Graphic abstract MoS 2 /BiOI composite were synthesized by two-step ways and showed wide linear range, low detection limit and great application potential in the photoelectrochemical (PEC) detection of hexavalent chromium (Cr (VI)).