Detection of Cr(VI) in agricultural products by photoelectrochemical sensor based on SnS/Bi2MoO6

Firstly, Bi2MoO6, SnS and SnS/Bi2MoO6-X (X = m(SnS)/m(Bi2MoO6), 1.66%, 2.26%, 3.32%) were synthesized through hydrothermal and agitation method. Subsequently, the morphology, structure and visible light absorption range of these materials were studied by a series of physical characterizations. The results show that the SnS/Bi2MoO6-X have a wider visible light absorption range and significantly higher separation efficiency of photogenerated carriers compared with the pure Bi2MoO6 and SnS. Among composites, SnS/Bi2MoO6 -2.26% exhibits the best visible light absorption rate and carrier transfer efficiency. Furthermore, PEC tests suggest that SnS/Bi2MoO6-X composites exhibit higher PEC responses, and SnS/Bi2MoO6-2.26% has the strongest PEC activities. In addition, the PEC sensor based on SnS/Bi2MoO6-2.26% shows a lower detection limit (0.122 mu M, S/N = 3) and a wider detection range (0.5 similar to 310 mu M) for Cr (VI). Meanwhile, the PEC sensor displays a good consistency in the detection results of Cr (VI) in lake, soil and agricultural products.

Automated summary

By synthesizing composites of different materials and characterizing them physically, it was found that SnS/Bi2MoO6-2.26% has better visible light absorption performance and carrier transfer efficiency, and it has a lower detection limit and a wider detection range in the detection of Cr (VI).