Fabrication and mechanism of a novel direct solid-state Z-scheme photocatalyst CdS/BiOI under visible light

Abstract

A direct CdS/BiOI Z-scheme heterojunction has been successfully synthesized via a hydrothermal method for the first time. The photocatalytic performances of as-prepared samples were evaluated by rhodamine B degradation under visible light (λ > 420 nm) irradiation. The phase structures, morphologies and optical properties of the obtained samples were investigated by several characterization tools such as XRD, SEM, TEM, HRTEM, STEM, XPS, and UV-vis, photocurrent and PL spectroscopy. The results revealed that the CdS/BiOI Z-scheme heterojunction exhibited much higher photocatalytic activity than pure BiOI and CdS, and the sample of CdS/BiOI-2 showed the best activity among all the heterostructure photocatalysts. In addition, the ESR spectrum indicated that ˙O2− and e − were the main active species for the photocatalytic degradation of RhB in our experiment.

Review on Metal Sulphide‐based Z‐scheme Photocatalysts

“…A typical case is CdS/BiOI photocatalyst, which was evaluated by RhB degradation . In this work, EDTA‐2Na, K 2 CrO 7 , isopropanol (IPA) and p‐benzoquinone (BQ) were respectively used for trapping holes, electrons, .…”

In situ sulfuration synthesis of flexible PAN-CuS “flowering branch” heterostructures as recyclable catalysts for dye degradation

“…Many previous studies have shown that metal oxide/chalcogenide semiconductors play an important part in the photocatalytic process. [12][13][14][15][16] However, for now, there are still challenges regarding the large-scale construction of recyclable photocatalytic materials through mild methods.…”

The Bi/Bi2WO6 heterojunction with stable interface contact and enhanced visible‐light photocatalytic activity for phenol and Cr(VI) removal

“…Moreover, the EDS and elemental mapping analysis [Fig. (c–f)] demonstrates that the Bi, W and O elements are homogeneously distributed on the surface of flower‐like microsphere, which explicitly demonstrates that the as‐prepared sample is Bi/Bi 2 WO 6 composite catalyst …”