ConclusionsIn this study, the photocatalytic degradation characteristics ofacetochlor by BiOBr under visible light irradiation were studied. Therelationship between the degradation rate and catalyst dosage ofweakly polar acetochlor was compared with that of strongly polarRhB. The results reveal that the two systems exhibited differentbehaviors, which were closely related to their adsorption behaviors.The saturation adsorption capacity of the weakly polar acetochlordecreased as the BiOBr dose increased in an aqueous solution,which might result from the re-distribution process on BiOBr. Thisadsorption feature provides more sites for dioxygen to adsorb onBiOBr, in turn provide an efficient way to efficiently eliminate ecb−to accelerate the degradation rate. In addition, BiOBr photocat-alytic degradation of the other weakly polar pesticides, propachlorand beta-cypermethrin, and polar compound, MO and SA wereemployed to verify the universal of substrates. The insights offeredhere support the efforts focused on the development of more effec-tive catalysts for the photocatalytic degradation of weakly polarorganic compounds in water.