Construction of quantum dots self-decorated BiVO₄/reduced graphene hydrogel composite photocatalyst with improved photocatalytic performance for antibiotics degradation

In this study, we report the construction of a novel composite photocatalyst (BiVO₄/rGH) composed of quantum dots (QDs) self-decorated BiVO₄-nanoparticels (NPs) and reduced graphene hydrogel (rGH). The composite structures were prepared using an in-situ growth method. The BiVO₄/rGH composite photocatalysts exhibited excellent photocatalytic efficiency for the degradation of tetracycline hydrochloride (TCHCl). The promoted photocatalytic activity of the BiVO₄/rGH is attributed to the synergetic effects of the unique structure involving QDs self-decorated BiVO₄ NPs and a 3D network structure of rGH, which resulted in higher number of photogenerated charge carriers, surplus active sites, and enhanced charge separation. In addition, trapping measurements showed that ·O₂^- and h⁺, as the main active species, play a crucial role in the degradation of TCHCl over the composite photocatalyst. This study facilitates the design and construction of high efficiency hybrid photocatalysts with multifunctional materials for the removal of water pollutants.