Hollow cubic Cu2-xS/Fe-POMs/AgVO3 dual Z-scheme heterojunctions with wide-spectrum response and enhanced photothermal and photocatalytic-fenton performance

The assembly photocatalyst with rational design of nanostructure can effectually inhibit the rapid charge recombination and improve the photocatalytic performance. Herein, a hollow cubic Cu2-xS/Fe-polyoxometalate/AgVO3 (Cu2-xS/Fe-POMs/AgVO3) dual Z-scheme heterojunction superstructure is constructed on the surface of a hollow cubic Cu2-xS with a clear structure by continuous growth deposition. The hollow cube structure can promote the utilization of light through the refraction and reflection of light in the cavity. Fe-POMs act as the linker between Cu2-xS and AgVO3, providing adequate active sites. In addition, due to the surface plasmon resonance effect of Cu2-xS, Cu2-xS/Fe-POMs/AgVO3 has an obvious photothermal effect, which extends the photoresponse to near-infrared region. The hollow cubic Cu2-xS/Fe-POMs/AgVO3 photocatalyst has excellent photocatalytic-Fenton degradation rate of 98.6 % for bisphenol A within 150 min due to the formation of dual Z-scheme heterostructures benefiting spatial charge separation. This work provides new insights for fabricating superstructure photocatalyst with high-performance and broad-spectrum response.