Phosphorus-doping CdS@NiFe layered double hydroxide as Z-Scheme heterojunction for enhanced photocatalytic and photo-fenton degradation performance

Abstract

A novel P-doping CdS [email protected] layered double hydroxide (LDH) Z-scheme photocatalyst ([email protected]) is synthesized through hydrothermal and calcination strategies. Phosphorus doping could form a new Fermi level and reduce the intermediate band gap, thereby prolonging the lifetime of photo-generated electron carriers. The well-designed core–shell nanostructure is conducive to the rapid transfer of carriers. The formation of Z-scheme heterojunction can provide a higher redox potential and reduce the photo-corrosion phenomenon of CdS. The prepared 20% wt [email protected] sample exhibits the highest hydrogen generation rate, which is about 39 times higher than that of the pristine CdS sample. In addition, the degradation rate of [email protected] photocatalyst on bisphenol A is about 98% within 160 min irradiation. With the addition of H2O2, the photocatalytic degradation performance can be improved significantly due to the photo-Fenton reaction. The excellent catalytic performance can be attributed to the synergistic effect of P-doping and Z-scheme heterojunction extending the photoresponse and promoting spatial charge separation. This research provides a new perspective for the design and synthesis of other Z-scheme heterojunction structure photocatalysts.