S-scheme Bi2MoO6/BiOBr heterostructure for effective removal of dye: Synergistic mechanism insight of adsorption-photocatalysis

The S-scheme Bi2MoO6/BiOBr honeycomb heterostructure has been constructed by solvothermal method. The removal ability of dyes and the synergistic effect of adsorption-photocatalysis were investigated. The optimal sample Bi2MoO6/BiOBr-2 can remove 99.6% of MB, 98.1% of TC, and 86.3% of RhB within 30 min, and the excellent photocatalytic performance attributes to the collaboration of adsorption and photocatalysis. The Langmuir isotherm model and the pseudo-second-order kinetic curves are followed in the adsorption of MB by Bi2MoO6/BiOBr-2. It can be concluded that the adsorption of MB on Bi2MoO6/BiOBr is exothermic and spontaneous by adsorption energy calculations. The S-scheme interface transfer effectively promotes the photo- generated carriers transfer and enhances the photocatalytic activity, and the mechanism of adsorptionphotocatalysis collaborative removal of pollutants was further proposed. This work has guiding significance for the construction of materials for collaborative removal of pollutants from water by adsorption photocatalysis, and provides a new idea for water pollution control.