Fig. 5From: Hollow and oval-configured ultrafine Co3O4 as a highly-efficient activator of monopersulfate for catalytic elimination of Azorubin S(a) HOCO, (b) MPS, (c) ARS concentrations, (d) temperatures, (e) pH values, and (f) surfactants and salt. (Reaction conditions: catalyst = MPS: 100 mg L− 1, T = 30 °C)Back to article page