Activated carbon catalyzed persulfate oxidation of Azo dye acid orange 7 at ambient temperature

▶ The GAC/PS system can significantly induce AO7 degradation at ambient temperature. ▶ PS could be decomposed by GAC catalysis. ▶ Adsorption has an adverse effect on AO7 degradation. ▶ SO4− or HO, generated on or near the surface of GAC, plays a major role. ▶ The recovery performance of GAC is high.