0-Dimensional/1-dimensional S-scheme Ag2S/BiSI hetero-structured photocatalyst for superb Cr(VI) reduction under full
Chun Xiao1, Zhuangzhuang Wang2, Mingyu Zhang3
1College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, PR China; Guangdong Provincial Key Laboratory of Eco-environmental Studies and Low-carbon Agriculture in Peri-urban Arease, Zhaoqing University, Zhaoqing 526061, PR China.
Abstract:
Developing ultraviolet (UV), visible (Vis) and near-infrared (NIR) responsive photocatalysts for Cr(VI) reduction is valuable. Herein, a 0-dimensional/1-dimensional (0D/1D) S-scheme Ag2S/BiSI hetero-structured photocatalyst was successfully synthesized, which displays greatly enhanced Cr(VI) removal activity either under UV, Vis or NIR light irradiation. In-situ characterization technique and theoretical calculation confirm that an internal electric field (IEF), directing from Ag2S to BiSI, exists between the interface, which facilitates the spatial-oriented separation of photoirradiated carriers. Furthermore, the immobilization of Cr2O72- and the transformation from *Cr2O72- to *CrO3H2 on the surface of S-scheme Ag2S/BiSI heterostructure is much more favorable than that on the surface of single Ag2S or BiSI. This work gives a comprehensive insight on the design of full spectrum responsive S-scheme photocatalysts for heavy metal removal.
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