Treatment of Rhodamine B wastewater by Fischer-Tropsch magnetic slag
Magnetic slag containing Fe,Mn and other elements was obtained from iron-based Fischer-Tropsch synthesis waste slag through magnetic separation.The surface structure,elemental composition and pore structure of the magnetic slag were characterized.And the magnetic slag was used in the Fenton system that catalyzed the degradation of Rhodamine B by H2O2.The results show that Fe in the magnetic slag exists in the form of Fe2+and Fe3+,and Mn exists in the form of Mn2+,Mn3+and Mn4+.The presence of Mn2+and Mn3+promotes the decomposition of H2O2 and accelerates the circulation of Fe2+,so that the removal rate of Rhodamine B in the system using magnetic slag as catalyst is 17.57％higher than that of using Fe3O4 as catalyst.The removal rate of Rhodamine B is 98.25％at mass concentration of 100 mg/L,initial pH=3,reaction temperature of 45 ℃,with magnetic slag and H2O2 dosage of 2.5 g/L and 20 mmol/L.After the magnetic slag is reused four times,the removal rate of Rhodamine B can still reach 90％.
Fischer-Tropsch slagcatalytic oxidationFenton oxidationmagnetic separationRhodamine B
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