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The composite photocatalysts composed of BiPbO 2 Cl and reduced graphene oxide (rGO) were synthesized by a one-step hydrothermal method. The UV–vis absorbance spectra results show that the BiPbO 2 Cl nanosheet absorbs more visible light when it is combined with graphene. The Raman spectra results indicate that the D and G bands are not visible from the Raman spectra of BiPbO 2 Cl, and the peak strength of two bands is increased with the increase of graphene content. The obtained 2 wt% rGO/BiPbO 2 Cl nanosheet composites exhibit higher photocatalytic activity, which is 5.7 times compared with that of BiPbO 2 Cl nanosheets. The improved photocatalytic activity of the rGO/BiPbO 2 Cl composites is ascribed to effective charge transfer due to graphene. [ABSTRACT FROM AUTHOR]

• MoS 2 /BiVO 4 heterojunction degrade RhB solution quickly without any addition agent. • Electrons in CB of MoS 2 and holes in VB of BiVO 4 promote redox ability. • MoS 2 /BiVO 4 heterojunction drive photocatalytic discoloration of RhB. Heterojunction photocatalysts can accelerate photo-excited electron-hole separation in the photocatalytic application. Herein, one BiVO 4 @MoS 2 core-shell heterojunction was synthesized via growing MoS 2 nanosheets on electrospinning-fabricated BiVO 4 nanorods by solvothermal technique. The MoS 2 /BiVO 4 heterojunction can completely degrade RhB solution within 20 min without any additional agent. According to the S-scheme heterojunction principle, the electron transfer process retains the powerful electrons in CB of MoS 2 and powerful holes in VB of BiVO 4 , and then promotes the excellent redox ability and strong driving force for photocatalytic discoloration of RhB. [ABSTRACT FROM AUTHOR]

• A series of BiVO 4 samples composited with NiSe 2 nanosheets were prepared through a facile solvothermal method. • The photocatalytic degradation rate of RhB of the optimized sample reaches 11 times higher than that of pure BiVO 4. • The Schottky junction derived from the discrepancy of work function accelerates the separation of photogenerated carriers. • The interaction at the interface reduces the band gap of BiVO 4. The rapid recombination of photogenerated carriers limits the photocatalytic activity of BiVO 4. Here, we grew NiSe 2 nanosheets on the surface of BiVO 4 through a facile solvothermal method to construct a Schottky junction. Due to the discrepancy of work function, electrons at the interface are transferred from BiVO 4 to NiSe 2 , thereby forming a built-in electric field. In virtue of the built-in electric field and the good conductivity of NiSe 2 , the photo-generated carriers can be quickly separated and transferred. In addition, the interaction at the interface reduces the band gap of BiVO 4 , which increases the absorption of visible light. These above benefits improve the photocatalytic performance. The photocatalytic reaction under visible light shows that the degradation rate of RhB for 9 mol% NiSe 2 composited BiVO 4 increases by 11 times compared with pure BiVO 4. The simplicity of the preparation method and the significantly improved performance show the enormous potential of NiSe 2 to be coupled with other semiconductor photocatalysts to improve their catalytic activity. [ABSTRACT FROM AUTHOR]